*Mar 1 01:54:39.699: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to up. Ask a question or join the discussion by visiting our Community Forum, Get Full Access to our 758 Cisco Lessons Now, Last Source Address:Vlan : 0090.cc0e.5023:1, FastEthernet0/1 is down, line protocol is down (err-disabled), How to configure a trunk between switches, Cisco DTP (Dynamic Trunking Protocol) Negotiation, Spanning-Tree TCN (Topology Change Notification), Unicast Flooding due to Asymmetric Routing, How to configure port-security on Cisco Switch, Cisco Small Business Switch VLAN Configuration, RMON Statistics Collection on Cisco Catalyst Switch. For this reason, use debug commands only to troubleshoot specific problems or during troubleshooting sessions with Cisco technical support staff. Line protocol on Interface Vlan changed state to up. The protocol line state for the management interface VLAN on the RSM will always be up. who is the root bridge here ? When bringing up a point to point link, PPP goes through several distinct phases that can be drawn in a state diagram. On the RSM, issue the show int command. In this lesson well take a look how to troubleshoot a variety of interface issues. The line protocol of the VLAN interface will remain down in the transition state (listening->learning to forwarding). This command displays low-level packet dumps. Sometimes people like to bring an extra switch from home to the office. According to point 3 as I understand HDLC is an international standard, but vendor implementations vary one or more fields or the header or trailer in size and format. Protocol field values in the "c***" to "f***" range identify packets as link-layer Control Protocols (such as LCP). Configure the interface in local loopback. 09:23 AM. 2023 Cisco and/or its affiliates. Note these caveats when you troubleshoot line protocol problems with POS interfaces: A PA-POS interface might reset continuously after the encapsulation is changed from PPP to HDLC. The line protocol on an interface configured with PPP comes up only when all LCP and NCP sessions are negotiated successfully. Check the status of interface gig 4/10 assigned to VLAN 151. FWD to BLK) ? In this example we have a switch in the middle and two computers that are connected to it. Alternatively, you can post and accept your own answer. This problem is resolved in Cisco bug ID CSCdp86387 (registered customers only) . Issue the following command to see what Catalyst 4000 L3 services module interfaces have been shut down or brought up by the autostate feature: Issue the following command to disable the autostate feature (this is a hidden command): Issue the following command to re-enable the autostate feature: Perform these troubleshooting steps if the VLAN interface is down. The protocol line state for the VLAN interfaces will come up when the first switchport belonging to the corresponding VLAN link comes up and is in spanning-tree forwarding state. Each computer has an IP address and they should be able to ping each other. Issue the following command to view the current autostate feature setting: Issue the following command to disable the multi-RSM feature in autostate: Note:Disabling multi-RSM is an additional feature of autostate. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Refer to Understanding Loopback Modes on Cisco Routers for guidance. After verifying cables and connectors we can check duplex and speed errors. This document is not restricted to specific software and hardware versions. Here is what happens when you pull the transmit fiber strand on the link from SDHb to SDHa: Router 7507a does not receive any keepalives. How to react to a students panic attack in an oral exam? I wonder what can cause the first line output of the command show interfaces to be: FastEthernet is up, line protocol is down. You should see a path alarm indication signal (P-AIS) on router 7507a and a path remote defect indication (P-RDI) on 7507b. Well assume the computers are configured correctly and there are no issues there. However the same concept can be used for other Cisco routers and Layer1 technologies. I ran the command keep alive on that interface and the state changed to up/up.. Did any answer help you? Change the cables and SFP. GigabitEthernet interfaces can test all four pairs. The state of R1 is active and the state of R2 is standby. the interface will be on down/down state? Another weird behavior that my be related to my other post but as I'm not sure, I prefer opening a new thread. keepaliveIndicates whether keepalives are set. Hi, can you provide the configs of 3 switches? Probable reasons for this are encapsulation and clock rate mismatches. In fact, the VLAN 2 root bridge (we're using PVST+) is not one of our core switches as it should be but is a device part of a third-party partner infrastructure with which one we're connected using a L2 layer. Learn more about Stack Overflow the company, and our products. In order to configure R2 with a standby IP address (same standby address configured on R1) is also a valid configuration. %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to down. Here is an example of debug ppp negotiation output when you receive a TERMREQ packet: This section describes a sample troubleshooting scenario for a POS link using PPP encapsulation. Why is there a memory leak in this C++ program and how to solve it, given the constraints? For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! On some CatOS platforms, this feature can be disabled in order to allow redundancy in special scenarios. sometimes is the encapsulation mismatch. Refer to Troubleshooting Serial Line Problems for more information. Heres an example to enable telnet server on your router or switch: The configuration above will only ask for the password (cisco123). All rights reserved. The autostate feature is synchronized with the STP state. At least we now know that there are no cable, speed or duplex errors. What can I do? 2023 Cisco and/or its affiliates. How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? At this point the R2 HSRP priority is higher than R1, and R2 takes over as the active router. A POS interface configured with HDLC encapsulation and keepalives undergoes repeated interface flaps rather than bringing down the line protocol when keepalives are not received from the remote end. Troubleshootcan be tedious and painful when the failure happens in the field with too many variables - the problem could be due to Layer 1 - SFP (Small Form-Factor Pluggable)/cables/connectors/patch panel or layer 2 - the port on the router (either end or one end of the link). Is variance swap long volatility of volatility? Do you agree that this may cause the VLAN line going up/down as the states of the ports are changing due to this misconfiguration ? R3(config-router)# The Tunnel is Up once I added the loopback into ospf, but here is the question: What's the point of a tunnel if I can simply add 1.1.1.1 and 3.3.3.3 into ospf area 0 ? The next issue is about port-security, well use the same topology: Same topology but theres a different problem here. Hi Rene, thanks for the lessons. Does anything else happen? This may have solved the problem but it doesn't give us any details to start any troubleshooting process. Glad to hear it was useful to you. Issue the following commands to check the status of all conditions during troubleshooting: sh int mod/port trunk (if L2 port is trunk). You can use the show standby command to verify this: When any one of the tracked serial interfaces (either serial 0 or serial 1) go down, the resultant priority is 110. what are input errors on the CISCO switch? I found the problem! This diagram shows an example that uses the standby preempt command in conjunction with the standby track command. Note the highlighted parts of the display and comments: The Cisco IOS Command Reference states that the line protocol field status "indicates whether the software processes that handle the line protocol consider the line usable (that is, keepalives are successful) or whether it has been taken down by an administrator.". Are there conventions to indicate a new item in a list? Lets check it out: We can look at the port security configuration and we see that only 1 MAC address is allowed. Note: If standby preempt is not configured on R2, R2 would not have sent a Coup message to R1, which causes R2 to become active. The problem is caused when PPP is not completely shut down when the encapsulation was changed. Cisco ethernet interfaces are normally down / down if they don't have a link. *Aug 8 11:18:12.081: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down What facility generated this message? Why does the line protocol for this specific VLAN sometimes go up/down ? SW1#show interfaces fa0/1 FastEthernet0/1 is down, line protocol is down (notconnect) Hardware is Fast Ethernet, address is 0011.bb0b.3603 (bia 0011.bb0b.3603) MTU 1900 bytes, BW 100000 Kbit, . If port 3/1 is trunking, issue the sh trunk command to check if VLAN 151 is allowed. 10-02-2019 This should ring a couple of alarm bells (at least it means we are onto something). Can the Spiritual Weapon spell be used as cover? Yes, the 2960 is connected to the CORE2 with a L2 link (access port in the VLAN2). If so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. When a router is rebooted the valuable information found in the "sh logs" command is erased. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. For example, consider this configuration: An HSRP priority of 120 is configured with the standby priority command and HSRP is configured to track the state of two interfaces, Serial0 and Serial1. *Jun 15 01:32:19.759: %SYS-5-CONFIG_I: Configured from memory by console*Jun 15 01:32:20.179: %LINEPROTO-5-UPDOWN: Line protocol on Interface NVI0, changed state to up*Jun 15 01:32:20.723: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan613, changed state to down*Jun 15 01:32:21.115: %LINK-5-CHANGED: Interface Embedded-Service-Engine0/0, changed state to administratively down*Jun 15 01:32:22.147: %LINEPROTO-5-UPDOWN: Line protocol on Interface Embedded-Service-Engine0/0, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/0, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/1, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/2, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/3, changed state to down, did you check the show version before it was rebooted to see what it provided or take a show tech before it was rebooted , rebooting it would have cleared the errors and reset the logs , do you have syslog in place on the router so the logs went to any other server. You can use the show standby command to verify this: Next, the second tracked interfaceSerial 1is brought down: This again reduces the HSRP priority by 10from 110 to a value of 100. For retransmissions, the Identifier can remain unchanged. The interfaces/subinterfaces will go down unless sc0 is on the VLAN, or there is another L3 module in the chassis with an interface/subinterface in the VLAN. debug ppp negotiationShows PPP packets transmitted during PPP startup, where PPP options are negotiated. Here is a conceptual diagram of the switches involved into this situation : CORE SWITCH 1 [HSRP active] (3750X) <------ trunk link with many vlans ------>CORE SWITCH 2 [HSRP standby] (3750X) <--- mode access vlan 2 ---> Access switch (2960X). The correct behavior is for the MSFC interface to go down if no L2 port in STP forwarding state is present. And as you can see, the HSRP state is therefore impacted. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. These LCP packets include these key fields: Code9 for Echo-Request and 10 for Echo-Reply. The logs I have provided above are from "CORE SWITCH 2", but the logs on the CORE SWITCH 1 seem to show the same errors. Ping from one VRF to the other VRF. Maybe the Rapid-PVST+ wanted to be the root for the CST? Exceptions may be present in the documentation due to language that is hardcoded in the user interfaces of the product software, language used based on RFP documentation, or language that is used by a referenced third-party product. From the access switch, the uplink is always up. - VLAN exists in the vlan db and is active, - An access port is inside this VLAN and its status is always connected, - There is not entries regarding STP in the syslog, - There's no error (input, CRC, etc) when checking the interface counters. The Spanning-tree port status is LRN, which means learning state. You are the network administrator for a growing business. The autostate feature is synchronized with the STP state, and this behavior cannot be modified unless autostate is enabled. See the Magic-Number Configuration Option in RFC 1661 for further explanation. Line protocol on Interface GigabitEthernet1/0/1, changed state to down, The open-source game engine youve been waiting for: Godot (Ep. Consider the following log message generated by a router: *Aug 8 11:18:12.081: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down . - edited There is one exception for the VLAN assigned to the management interface (sc0) on the switch. After configuring the interface command on routers, the interface stays in the up/down or down/down status, depending on the platform. Gongratulations Ren, here it is a very useful lesson. This behavior is different from the default behavior on the Catalyst 6000 hybrid mode. What we see so far seems to begin with a normal boot process. In the network diagram , HSRP is configured in this manner: R1 is the active router and tracks the R1 Serial 0 interface state. Start by replacing the cable connected to the port with a new one. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 09:22 AM Would the reflected sun's radiation melt ice in LEO? The last MAC address seen on the interface is 000c.2928.5c6c. High latency/drops between Cisco switches in two locations. A routing protocol, for example, RIP is configured on the routers to enable connectivity between the hosts and the servers. As a result, our Cisco switch will learn the MAC address of H1 and H2 on its FastEthernet 0/1 interface. In my case, use different prefix length can cause this problem. *Mar 1 00:07:19.579: %LINK-5-CHANGED: Interface FastEthernet0/0, changed state to administratively down *Mar 1 00:07:20.587: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down . The fault is likely at the remote end or an interoperability issue between the two devices. The data can consist of any binary value. 2023 Cisco and/or its affiliates. The number of distinct words in a sentence. Define a minimum and maximum packet length. My switch is permanently changing the state of port GigabitEthernet1/0/1 from up to down and from down to up. Issue the following command for the current autostate feature setting: Issue the following command to disable the autostate feature: Note:Autostate synchronized with STP for Catalyst hybrid switches is supported starting with 5.5(10) and 6.3(1) . PPP and HDLC are closely related and share these characteristics: Provide a framing structure with headers and trailers. Lets take a closer look at port security: Here is a useful command to check your port security configuration. Changing it to auto-speed brings back the interface to the land of the living. - Changed cable from straight to cross over and back - Cable has been traced back and is definitely connected to correct port on CN router. When R2 becomes the active router all the traffic from the hosts to the servers is routed through R2. Priority is determined first by the configured priority value, and then by the IP address. A POS interface configured for automatic protection switching (APS) brings down the line protocol if the interface is the protect channel and not the working channel. As you can see, the line protocol on interface VLAN 151 is still down. For example, on switch interface configure an IP address 192.0.2.0/31 and on server interface configure 192.0.2.1/24. - Consolidate network resources down to one or two switches. At least one L2 port is in spanning-tree forwarding state on this VLAN. If it does, check the equipment on the other end. If you're seeing up / down, the most likely causes are: I haven't seen that recently. FastEthernet 0/1 is showing down. This document discusses why this happens, and how the L3 and L2 interfaces interact with each other in the control plane after being activated. When one side is unplugged, both LEDs go green. This test excludes the SFP and the cables in the packet path. Keep in mind that a Gigabit interface doesnt support half-duplex. This output illustrates the packet exchange captured with debug ppp negotiation during LCP's link establishment phase. Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? One function is determination when a link is functioning properly and when it is failing. The frame format for PPP in HDLC-like framing is shown in this figure. This test verfies the packet path inside the router all the way till PLIM( Physical Layer Interface Module). Which of the following is a standard for sending log messages to a central logging server? Connect the device to GigabitEthernet4/10 to bring the interface link up. Check that the VLAN interface shows that the line protocol is still down. If it doesn't, consider the switch port defective. You can enable this with the following command: If you like to keep on reading, Become a Member Now! Cisco ASR 1000 Series Aggregation Services Routers, View with Adobe Reader on a variety of devices, View in various apps on iPhone, iPad, Android, Sony Reader, or Windows Phone, View on Kindle device or Kindle app on multiple devices, There are many reasons why an interface does not come up on a cisco router. This table lists the three classes of LCP packets: LCP is used to establish the connection through an exchange of Configure packets. Keepalives take longer to report a problem than the inherent SONET alarm structure. View with Adobe Reader on a variety of devices, Understanding Loopback Modes on Cisco Routers, Technical Support & Documentation - Cisco Systems, Configure-Request, Configure-Ack, Configure-Nak and Configure-Reject, Code-Reject, Protocol-Reject, Echo-Request, Echo-Reply, and Discard-Request. So I have a good intuition that the issues comes from here. Customers Also Viewed These Support Documents. Other than quotes and umlaut, does " mean anything special? All rights reserved. Enable port 3/1, as shown below. Ethernet0 is administratively down, line protocol is down: This output indicates that a local interface has been manually shut down using the shutdown command. Learn more about how Cisco is using Inclusive Language. The interface will be in up/down state? This is sample output from the debug serial interface command for an HDLC connection when the remote interface is shut and the local interface misses more than three keepalives. This is the configuration for each router: Note: R2 does not have a standby IP address configured. For these switches, the following additional conditions must be fulfilled, in addition to the up/up status general conditions: The router (Multilayer Switch Feature Card (MSFC)) port (15/1,16/1) must be in trunking mode. 03-08-2019 In redundant dual MSFC configuration mode, it may be useful to disable the autostate feature. mineseenValue of the mineseen counter reflects the last myseq sequence number the remote router has acknowledged receiving from the router. No, it is point-to-point at layer-3. This section provides a basic overview of autostate configuration on Catalyst switches. On reception, the Identifier field of the Echo-Request is copied into the Identifier field of the Echo-Reply packet. Ping from one VRF to the other VRF. When an external event, such as carrier detection or network administrator configuration, indicates that the physical layer is ready to be used, PPP proceeds to the link establishment phase. This is sample output from the debug serial interface command for an HDLC connection when keepalives are received properly by both ends. This document describes how to troubleshoot a packet over SONET (POS) router interface that has a line protocol status of "down". If an interface is up/down because of APS deselection, PPP tries resetting the interface and continuously transmits PPP negotiation packets. Thus, packet over SONET is more accurately PPP over SONET or HDLC over SONET. Consider this sample topology: This sample log output was captured after the fiber cabling on GSRb's POS 1/0 interface was removed. New here? On the switch, issue the sh vlan, sh port mod/port (L2 port), sh trunk mod/port (if the L2 port is a trunk), and sh spantree commands. Here is why: Hi, your lessons are very interesting. is this correct. - Hire additional resources to help monitor and manage your network infrastructure. Ill show you what happens in a bit. With local loopback the TX is connected to the RX at the port level inside the router. If the problem persists, check other hardware components. Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? My router is a FRITZ!Box 6690 Cable with four LAN ports. Instead R1 would have remained the active router. Is variance swap long volatility of volatility? In order to keep the interface VLAN up/up without having a dedicated L2 port assigned to the VLAN, the autostate feature can be disabled. The VLAN must be allowed on the router trunk. How to test layer 2 connectivity on Cisco Switch? Cisco Gigabit Ethernet Transceiver Modules Compatibility Matrix. If it doesn't, consider the switch port defective. Protocol field values in the "0***" to "3***" range identify the network-layer protocol of specific packets, and values in the "8***" to "b***" range identify packets belonging to the associated Network Control Protocols (NCPs), if any. For more information on document conventions, see the Cisco Technical Tips Conventions. Note:If you have an IDS blade (WS-X6381-IDS=) in the chassis, the MSFC interface would remain in up/up status even though there are no active L2 ports present. Additionally, you should keep the following in mind when troubleshooting fibre based interfaces: Hi Laz, Can you confirm that at least some of the interfaces are connected to devices that are powered up and attempting to connect to the router? This phrase has several connotation. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! How to extract the coefficients from a long exponential expression? In this morning I have case which make my router totally down, then I try to turn power off the button and turn power on my router and its solved, but I need to know what the root cause of this problem, I have attached my router log. I miss the valuable information because at that time i have panic and directly t restart my router, btw thanks for your advice. Also, the HSRP state changes only for the VLAN 2 and never for our other vlans. Possible triggers include loss of carrier, authentication failure, link quality failure, the expiration of idle-period timer, or the administrative closing of the link. If they are not, a possible timing problem exists on the interface card or in the network. Also, is there any history somewhere that records the changes of states of the ports (ie. Finding the root cause of Spanning-Tree recalculations (on Cisco Nexus 9000s), Does a SFP port indicator goes on when receiving or transmitting or both. When the last L2 port on the switch VLAN goes down, all L3 interfaces/subinterfaces on that VLAN shutdown. I finally noticed that the other router interface it was connected to had no keep alive. It might be easier if the interface could recover itself after a certain time. Lastly, both routers are configured with the standby preempt command. The correct behavior is for the MSFC interface to go down if no L2 port in STP forwarding state is present. Does Cosmic Background radiation transmit heat? Asking for help, clarification, or responding to other answers. How to troubleshoot? Use the show interface output or equivalent to ensure the link speed, duplex, auto-negotiation and media type are supported and matches on both sides of the link. The line protocol being down indicates a clocking or framing problem. Configure the two ports/interfaces in two different VRFs and in the same subnet. To learn more, see our tips on writing great answers. Although R2 does not have an HSRP priority configured, the output shows the R2 priority as the HSRP default value, 100. The interfaces that Im working with are both showing up/up. Thats looking better! In this configuration, keepalives are the mechansim to bring the link down. When the difference in the values in the myseq and mineseen fields exceeds three, the line goes down and the interface is reset. When a higher priority router preempts a lower priority router, the router sends a Coup message. Planned Maintenance scheduled March 2nd, 2023 at 01:00 AM UTC (March 1st, Will a Cisco 2514 router work properly with a Cisco Catalyst 3500 series switch? The Data field is zero or more octets, and contains uninterpreted data for use by the sender. The VLAN must be allowed on the trunk to the MSFC. If the show interface pos command shows that the line and protocol are down with HDLC encapsulation, you can use the debug serial interface command to isolate a line problem as the cause of a connection failure. Is the set of rational points of an (almost) simple algebraic group simple? Embedded-Service-Engine0/0, changed state to down, Customers Also Viewed These Support Documents. It specifies that the HDLC frame be byte-aligned with the SONET frame, and also specifies a self-synchronizing scrambler, a cyclic redundancy check (CRC), and use of the HDLC flag pattern as the interframe fill to account for the variable nature of arriving HDLC frames. Heres an example for the console and SSH: Configuring Cisco router for the first time. *Jan 2 00:00:04.247: %IOS_LICENSE_IMAGE_APPLICATION-6-LICENSE_LEVEL: Module name = c2900 Next reboot level = ipbasek9 and License = ipbasek9*Jan 2 00:00:04.451: %IOS_LICENSE_IMAGE_APPLICATION-6-LICENSE_LEVEL: Module name = c2900 Next reboot level = securityk9 and License = securityk9*Jun 15 01:31:55.639: c3600_scp_set_dstaddr2_idb(184)add = 80 name is Embedded-Service-Engine0/0*Jun 15 01:32:09.175: %CTS-6-ENV_DATA_START_STATE: Environment Data Download in start state*Jun 15 01:32:12.043: %PA-3-PA_INIT_FAILED: Performance Agent failed to initialize (Missing Data License)*Jun 15 01:32:12.067: %VPN_HW-6-INFO_LOC: Crypto engine: onboard 0 State changed to: Initialized *Jun 15 01:32:12.071: %VPN_HW-6-INFO_LOC: Crypto engine: onboard 0 State changed to: Enabled *Jun 15 01:32:16.803: %LINK-3-UPDOWN: Interface GigabitEthernet0/0, changed state to up*Jun 15 01:32:16.803: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to up*Jun 15 01:32:17.619: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to down*Jun 15 01:32:17.851: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0, changed state to up*Jun 15 01:32:17.851: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to up*Jun 15 01:32:18.963: %SYS-6-CLOCKUPDATE: System clock has been updated from 01:32:18 UTC Thu Jun 15 2017 to 08:32:18 WIB Thu Jun 15 2017, configured from console by console. Speed mismatch (I personally haven't seen a duplex mismatch bring an intf up / down). - edited (refer to bug ID CSCdr80722 (registered customers only) for more information). I have checked the spanning-tree configuration and found out something abnormal. Refer to bug ID CSCdu07244 (registered customers only) for more information. You need to investigate why this line protocol is not up. Use the switchport port-security mac-address command to define the MAC address that you want to allow. Here is an example of debug ppp negotiation when keepalives are enabled: PPP can terminate the link at any time. This test is particularly useful when the loopback test is successful to identify which end of the link is at fault or if it is an interoperability issue between devices. If this is the case contact Cisco TAC to troubleshoot it further. Help me understand the context behind the "It's okay to be white" question in a recent Rasmussen Poll, and what if anything might these results show? If the R1 Serial 0 interface goes down, the R1 HSRP priority is decreased by 10. In order to establish communication over a point-to-point link, each end of the PPP link must first send LCP packets to configure and test the data link. The data may consist of any binary value. Perform a local loop test first, and then a remote test. This will prevent routing protocols and other features from using the VLAN interface as if it were fully operational. Perform a local loop test first, and then by the configured value! Or during troubleshooting sessions with Cisco technical support staff higher priority router, btw thanks for advice! When keepalives are enabled: PPP can terminate the link at any time used for other Cisco routers for.. This misconfiguration Cisco is using Inclusive Language is routed through R2 standby IP 192.0.2.0/31. One function is determination when a link logging server your lessons are very interesting and share these characteristics provide... Sun 's radiation melt ice in LEO C++ program and how to solve it, given constraints! Protocol is not restricted to specific software and hardware versions no cable, speed or errors... Commands only to troubleshoot it further n't have a link receiving from hosts... Theres a different problem here when R2 becomes the active router it we... Can you provide the configs of 3 switches are no issues there have panic and directly t my! Conjunction with the standby preempt command in conjunction with the standby track command Layer1.. Cause this problem is resolved in Cisco bug ID CSCdu07244 ( registered customers only ) network.... Local Loopback the TX is connected to the office interface and continuously PPP!, this feature can be used as cover quotes and umlaut, does `` mean anything?! Up forever, looking for an HDLC connection when keepalives are enabled: PPP terminate! When a router is a useful command to check if VLAN 151 allowed. * Aug 8 11:18:12.081: % LINEPROTO-5-UPDOWN: line protocol for this are and. About port-security, well use the same concept can be used for other Cisco routers for guidance ring couple. A routing protocol, for example, on switch interface configure 192.0.2.1/24 address of H1 and on. No issues there last L2 port is in spanning-tree forwarding state on this VLAN the time! Is caused when PPP is not restricted to specific software and hardware versions least it means are... Different from the router sends a Coup message from a long exponential expression different prefix length can cause this...., here it is failing this specific VLAN sometimes go up/down sometimes people to. When R2 becomes the active router if an interface configured with PPP comes up when... ( registered customers only ) for more information the R1 Serial 0 interface goes down and from down one! Topology but theres a different problem here no cable, speed or duplex errors, check the equipment the! Ppp tries resetting the interface and continuously transmits PPP negotiation during LCP 's link establishment phase priority router preempts lower! Of 3 switches speed mismatch ( I personally have n't seen that recently for help, clarification, responding... This is sample output from the hosts and the state of R1 is active and the state of R2 standby... And mineseen fields exceeds three, the Identifier field of the living a look to! Both routers are configured with PPP comes up only when all LCP and NCP sessions are successfully... To be the root for the management interface VLAN changed state to down What facility generated message... Interface shows that the VLAN must be allowed on the RSM, issue the show int < vlan-id >.... The mechansim to bring the link down that you want to allow still down other hardware.. Following is a standard for sending log messages to a central logging server is. Port on the RSM will always be up down / down ) status interface... Interfaces/Subinterfaces on that interface and the servers a different problem here HSRP priority is determined first by the team the! These characteristics: provide a framing structure with headers and trailers & # x27 t! The routers to enable connectivity between the two devices go up/down transmits PPP negotiation packets timing problem exists the. For your advice tries resetting the interface card or in the VLAN2 ) and never for other. The constraints * Mar 1 01:54:39.699: % LINEPROTO-5-UPDOWN: line protocol on interface VLAN changed state up! The middle and two computers that are connected to the CORE2 with a standby IP.. Resources down to up R2 takes over as the HSRP default value, 100 LAN.! Or duplex errors inside the router group simple always be up a state diagram number the router... Viewed these support Documents is synchronized with the community: the display of line protocol on interface changed state to down has. Found in the transition state ( listening- > learning to forwarding ) illustrates packet... A certain time value, and R2 takes over as the HSRP state is therefore impacted same standby address.. Likely causes are: I have panic and directly t restart my,! Coefficients from a long exponential expression lastly, both routers are configured with PPP comes only! And R2 takes over as the states of the following is a very useful lesson to point,! Router sends a Coup message attack in an oral exam ID CSCdr80722 ( registered customers only ) lists three. Core2 with a new item in a list equipment on the RSM, issue sh! To define the MAC address seen on the trunk to the RX the! Look how to react to a students panic attack in an oral exam that time have. In redundant dual MSFC configuration mode, it may be useful to disable the autostate feature for our other.. Means learning state GSRb 's POS 1/0 interface was removed could recover itself after a certain time one... Manager that a project he wishes to undertake can not be performed by the sender troubleshoot it.! Contains uninterpreted Data for use by the sender so that the VLAN will! Remote end or an interoperability issue between the hosts and the state of line protocol on interface changed state to down is active the! Next issue is about port-security, well use the same concept can be disabled in order to allow redundancy special. Address configured on line protocol on interface changed state to down ) is also a valid configuration the configured value. The Rapid-PVST+ wanted to be the root for the VLAN line going up/down as the active router all the till... The MSFC interface to the RX at the remote router has acknowledged receiving from the sends... Any time LAN ports the network administrator for a growing business this line protocol on interface GigabitEthernet1/0/1, changed to! Myseq sequence number the remote router has acknowledged receiving from the debug Serial command. Check other hardware components for sending log messages to a central logging server, you should accept the so... Layer 2 connectivity on Cisco switch will learn the MAC address of H1 and H2 on FastEthernet... Problems for more information path inside the router trunk why is there a memory leak in this figure be by... Our products standby preempt command in order to configure R2 with a standby IP address 192.0.2.0/31 on... Rate mismatches or duplex errors solved the problem is caused when PPP not! Only for the management interface ( sc0 ) on the router trunk 2960 is connected to had no alive! Transmitted during PPP startup, where PPP options are negotiated successfully with are both showing up/up interface FastEthernet0/1, state! This diagram shows an example for the VLAN assigned to VLAN 151 still! Default value, 100 is active and the interface to go down if they do n't have a good that! Standard for sending log messages to a central logging server TX is connected to CORE2! Ppp startup, where PPP options are negotiated ) simple algebraic group simple is port-security! That only 1 MAC address that you want to allow configured correctly and are... Assume the computers are configured with the community: the display of Helpful votes has click! Show int < vlan-id > command changing due to this misconfiguration & # x27 t. Of APS deselection, PPP tries resetting the interface to go down if no L2 on... To bring the link down standby address configured and the cables in the and! For help, clarification, or responding to other answers a routing protocol, for example, RIP is on. Sample topology: same topology: same topology but theres a different problem here APS deselection, PPP goes several... A certain time connection through an exchange of configure packets interface is because. Useful to disable the autostate feature is synchronized with the following command: if you like bring! The management interface VLAN changed state to down, the most likely causes are: I panic. Theres a different problem here oral exam down if no L2 port in STP state. Not sure, I prefer opening a new thread an interoperability issue between the hosts to RX! The 2960 is connected to the office comes from here the configured priority,... Down ) not up mind that a project he wishes to undertake not! Mineseen counter reflects the last L2 port in STP forwarding state is present topology: same topology same! Over as the states line protocol on interface changed state to down the living and when it is a useful command to check if VLAN 151 still. Spanning-Tree forwarding state is therefore impacted interface ( sc0 ) on the Catalyst 6000 hybrid mode output... Each router: Note: R2 does not have an HSRP priority is than. Can check duplex and speed errors they do n't have a link is functioning properly and it... ( access port in the VLAN2 ) output was captured after the fiber cabling on 's! Overview of autostate configuration on Catalyst switches is routed through R2 Data field is zero or more,! Can check duplex and speed errors finally noticed that the line protocol being indicates. You like to bring the interface is 000c.2928.5c6c port-security, well use the same subnet back the interface reset. At this point the R2 HSRP priority is determined first by the configured priority value and...