If it does, check the equipment on the other end. You need to verify spanning-tree port status on the L2 port (should be forwarding). *Aug 8 11:18:12.081: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down What facility generated this message? (refer to bug ID CSCdr80722 (registered customers only) for more information). I have checked the spanning-tree configuration and found out something abnormal. 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). If this is the case contact Cisco TAC to troubleshoot it further. On the RSM, issue the show int command. Can the Spiritual Weapon spell be used as cover? The documentation set for this product strives to use bias-free language. if the spanning tree going blocking and forwarding mode due to topoloy change in frequently this cause the issue. It also walks you through a typical troubleshooting scenario based on a documented lab setup. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. Transport IP packets and provide a method for receivers to determine the precise type of packet inside the arriving frame. Spanning-tree port status is in listening yet. 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. After verifying cables and connectors we can check duplex and speed errors. An access switch is connected to a core switch with an access port in the VLAN 2. If the keepalive values in the mineseq, yourseen, and myseen fields are not incrementing in each subsequent line of output, there is a problem at one end of the connection. Hi, can you provide the configs of 3 switches? 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. 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. Line protocol is down on Cisco Router / IOS 12.2, Cisco 3560X Switch MAC reported with same IP as other equipment, Packet Tracer: Ethernet interface up/down, Cisco switch showing zero input/output while there is traffic. This phrase has several connotation. Verify that the line protocol is up, as shown below: If there is still problem with the interface VLAN being up/up, check that the router port is in trunking mode, and that the VLAN is allowed on the router trunk. This means that another HSRP router with higher priority can become the active router if that router has the standby preempt enabled. Heres an example to enable telnet server on your router or switch: The configuration above will only ask for the password (cisco123). The remote router stores this value in its yourseen counter and sends that value in a keepalive packet to the router. Additionally, you should keep the following in mind when troubleshooting fibre based interfaces: Hi Laz, Provide frame delineation, which defines for a receiver exactly where a packet and frame begins and ends. New here? All of the devices used in this document started with a cleared (default) configuration. This is the symptom of a VLAN interface being in up/down status. Protocol field values in the "c***" to "f***" range identify packets as link-layer Control Protocols (such as LCP). This change makes the R2 priority of 100 higher. Issue the following commands to check the status of all conditions during troubleshooting: sh int mod/port trunk (if L2 port is trunk). Thanks. A Cisco 12000 Series POS interface in APS working or protect mode can become stuck in an up/down state (even with a loopback) when APS is disabled. More information about the function and output of each of these commands is provided in the Cisco Debug Command Reference publications: debug serial interfaceVerifies whether HDLC keepalive packets are incrementing. 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. It is possible that no device is connected to the interface or that the link has cabling or auto-negotiation issues preventing the link from being up. On IOS based switches, this feature cannot be disabled. Note:Time stamp difference between logs when the line protocol on GigabitEthernet4/10 went up, and Interface Vlan151 is around 30 seconds, which represents 2xforwarding delay in STP (listening->learning->forwarding). Moreover, it is best to use debug commands during periods of low network traffic and fewer users. How is the "active partition" determined when using GPT? The last MAC address seen on the interface is 000c.2928.5c6c. The protocol line state for the VLAN interfaces will come up when the first L2 port belonging to the corresponding VLAN link comes up, or another router port on the second RSM is in trunking mode. 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. Sometimes people like to bring an extra switch from home to the office. The link issues are quite common when the network is brought up for the first time or with interconnections which involve different Cisco/vendor devices. Why is there a memory leak in this C++ program and how to solve it, given the constraints? The documentation set for this product strives to use bias-free language. Is quantile regression a maximum likelihood method? The examples are pulled for an ethernet link on ASR1000 router. Thus, you see the line protocol come up briefly on a periodic basis when there is a sustained problem, even when the fiber is removed. Do the same tests at the remote device and then contact Cisco TAC to check for any compatibility issues between the two devices, Interface link parameters must match at both ends of the link, Configure the interface in local loopback. Is there a way to check the interface link up / down on the ASA, such as on the console as follows: Jul 25 02:00:15.268: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/1, changed state to up Jul 25 02:00:17.903: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/1, changed state to down Jul 25 02:00:18.903: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/1 . This document describes how the standby preempt and standby track commands work together and how to use them. Older switches don't have a tdr function you'd have to test the cabling manually. PPP is not aware of APS. Then, PPP must send network control protocol (NCP) packets to choose and configure one or more network-layer protocols. The open-source game engine youve been waiting for: Godot (Ep. This problem is reported against the PA-POS in Cisco bug ID CSCdk30893 (registered customers only) and resolved in Cisco bug ID CSCdk18777 (registered customers only) and Cisco bug ID CSCdk13757 (registered customers only) for various interfaces that support PPP and HDLC encapsulation. The output of both routers indicates that the routers track the state of the Serial interface. Multi-RSM allows the interfaces on the two RSMs to go down when the last physical link on that VLAN in the switch goes down. 10:55 PM When a router is rebooted the valuable information found in the "sh logs" command is erased. If not, what would cause an interface to be in an up,down state? 06-14-2017 Learn more about how Cisco is using Inclusive Language. This is intentional in order to demonstrate that this is a valid configuration. Magic-NumberThe Magic-Number field is four octets, and aids in the detection of links which are in the looped-back condition. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. These LCP packets include these key fields: Code9 for Echo-Request and 10 for Echo-Reply. Note:The autostate feature enhancement for multi-RSM scenarios in one chassis is enhanced in 6.1.2. VLAN interface exists on the router and is not administratively down. Lets try another ping (maybe we get lucky): Too bad, the ping is not working. CN router also shows the interface going up/down when disconnected and reconnected The latest implementation of the autostate feature allows synchronization to Spanning-Tree Protocol (STP) port status. The sc0 should always be up after the switch boots. If it doesn't, consider the switch port defective. Ping from one VRF to the other VRF. One of these is for a 2.5Gbps link that the switch was plugged into. When R2 becomes the active router all the traffic from the hosts to the servers is routed through R2. To sugget better, we would like to see your configuraiton and topology ? *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 . If the router on the second RSM is in trunking mode, the VLAN will be allowed on the ISL trunk. This test excludes the SFP and the cables in the packet path. Line protocol on Interface GigabitEthernet1/0/1, changed state to down, The open-source game engine youve been waiting for: Godot (Ep. Would the reflected sun's radiation melt ice in LEO? It only takes a minute to sign up. Configure the interface in local loopback. Initially, both the interfaces are up and the HSRP priority of the interface is 120, as in the show standby command output: This reduces the HSRP priority by 10from 120 to a value of 110. Aug 4 14:48:36.323 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Embedded-Service-Engine0/0, changed state to down I've rebooted a few times, tried removing all connections to the device. Change the cables and SFP. Keepalives are disabled automatically on most POS router hardware. When R1 and R2 exchange HSRP hellos, R2 learns the standby IP address from R1. "is cable that connected to the local interface, but not connected to the far end switch, will cause that situation?" 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) . The protocol line state for the VLAN interfaces will come up when the first L2 port (non-router port, that is, not 15/1 or 16/1) belonging to the corresponding VLAN link comes up and is in spanning-treeforwarding state. To learn more, see our tips on writing great answers. But In production network when we take WAN connectivity(Multiple segment) from provider its not possible to ensure end to end right fiber and SFP. The line protocol being down indicates a clocking or framing problem. When you finish using a debug command, remember to disable it with its specific no debug command or with the no debug all command. At this point the R2 HSRP priority is higher than R1, and R2 takes over as the active router. See the Magic-Number Configuration Option in RFC 1661 for further explanation. Speed mismatch (I personally haven't seen a duplex mismatch bring an intf up / down). Very interesting and informative - keep up the good work. Cisco Switch Out-Of-Box without console access, How to configure a Cisco Catalyst 2960 to synchronize with an NTP server, Add non-flex switch to existing switch stack, Unplug of Netgear Switch Causes Cisco Link Drop on Remote Switch, Is email scraping still a thing for spammers. If so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. @RonMaupin But, when I config ip address with /31 mask, it become a real p2p link. No, it is point-to-point at layer-3. 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. Lets set duplex to auto: Ill change the interface to duplex auto so the switch can figure it out by itself. Cisco ethernet interfaces are normally down / down if they don't have a link. Does Cast a Spell make you a spellcaster? 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. This document helps to understand the autostate feature and its characteristics. 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. This interface, however, can be forced to administratively down. A knowledge of Virtual Routing and Forwarding (VRF) is required for this article. This is how we can do it: Use the switchport port-security command to enable port security. what are input errors on the CISCO switch? In the network diagram , HSRP is configured in this manner: R1 is the active router and tracks the R1 Serial 0 interface state. This document discusses why this happens, and how the L3 and L2 interfaces interact with each other in the control plane after being activated. 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. 15 more replies! 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. Check the status of port 3/1 assigned to VLAN 15. Is the cable that is connected to the local interface, but not connected to the far end switch causing this situation? Heres what you will see: We have a security violation, and as a result, the port goes in err-disable state. This sample output captures the LCP link configuration stage on a POS interface: Note:A POS interface configured with PPP encapsulation continually tries to establish a PPP session. Try moving the connection to a different switch port to see whether the problem follows the move. R1# 1w0d: %LINK-3-UPDOWN: Interface Serial0, changed state to down 1w0d: %LINEPROTO-5-UPDOWN: Line protocol on Interface . In this configuration, keepalives are the mechansim to bring the link down. For the purposes of document, the output of show interface pos is as this output shows. Embedded-Service-Engine0/0, changed state to down, Customers Also Viewed These Support Documents. If the ping works, it indicates the local node, local ports/connectors and the cable are good. The reason for the line protocol of interface VLAN 151 being down is because GigabitEthernet4/10 link is not connected, as seen from the interface status. 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. Interface link parameters must match at both ends of the link. Corgon-6000# Mar 11 12:11:23.406: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan151, changed state to up. If the problem persists, check other hardware components. *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. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. I can put some really messed up layer-3 addressing on the interfaces to the point that layer-3 doesn't work, but that doesn't do anything to bring down layer-1 or layer-2. keepaliveIndicates whether keepalives are set. All rights reserved. changed state to down 1w0d: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1, changed state to down R1# This again reduces the HSRP priority by 10from 110 to a value of 100. Find answers to your questions by entering keywords or phrases in the Search bar above. Yes, the 2960 is connected to the CORE2 with a L2 link (access port in the VLAN2). All of the devices used in this document started with a cleared (default) configuration. Line protocol on Interface Vlan613, changed state to down *Jun 15 01:32:21.115: %LINK-5-CHANGED: Interface Embedded-Service-Engine0/ . VLAN trunking between Juniper EX -> Cisco Catalyst -> and Cisco Router. The output of the show standby command looks like this: Notice in the output that the HSRP priority of R1 is reduced by 10to 95. Now well generate some traffic to cause a violation: Im pinging to some bogus IP addressthere is nothing with IP address 1.2.3.4; I just want to generate some traffic. is there a chinese version of ex. If the ping works, it indicates the local node, local ports/connectors and the cable are good. 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? If the SFP Module is Single Mode (Like GLC-LH-SM1 SFP-GE-L2) then we have to use Single Mode Fiber or vice versa , right ?? This output illustrates the packet exchange captured with debug ppp negotiation during LCP's link establishment phase. In the question, the interface is layer-1, and the line protocol is layer-2. There also are various vendor-specific values. This is not the MAC address of my computer, so its perfect for demonstrating a violation. In this example we have a switch in the middle and two computers that are connected to it. Lets take a closer look at it: Hmm it says err-disabled. For more information on document conventions, see the Cisco Technical Tips Conventions. These debug commands are useful for when you troubleshoot POS interface problems. 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. 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 ? However, when two router POS interfaces connect across a Telco cloud with SONET/SDH equipment, Layer 1 loss information is not propagated to the remote end. 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. Is variance swap long volatility of volatility? 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.". Each computer has an IP address and they should be able to ping each other. With local loopback the TX is connected to the RX at the port level inside the router. Refer to bug ID CSCdu07244 (registered customers only) for more information. Asking for help, clarification, or responding to other answers. This could indicate a layer 1 problem like a broken cable, wrong cable (crossover instead of straight-through) or maybe a bad NIC. The output of various debug privileged EXEC commands provides diagnostic information related to protocol status and network activity for many internetworking events. Can you please tell me where did you discussed this topic. 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. If the cable is faulty, it could cause up / down status. If the problem persists, check other hardware components. To use this feature, autostate must be enabled. Thats looking better! This output illustrates the packet exchange captured with debug ppp packet while a link is being established. This problem is resolved in Cisco bug ID CSCdp86387 (registered customers only) . POS interfaces support PPP in High-Level Data Link Control (HDLC)-like framing, as specified in RFC 1662 , for data encapsulation at Layer 2. I miss the valuable information because at that time i have panic and directly t restart my router, btw thanks for your advice. I have configured port security, so only one MAC address is allowed. 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. The pattern is 0x7E, or 0111 1110. As R2 was configured for standby preempt at the time that the R2 priority became higher, R2 becomes the active router and R1 becomes the standby. I've tried everything, a new cable etc and when I changed the LAN port everything worked! Another card inserted in the same slot experiences this problem. Session into the MSFC and verify the status of the VLAN interface again. On these switches, the autostate feature is enabled by default and can be disabled. Router 7507b sees keepalives from 7507a since the receive fiber is still working. I think this is because they use a lower priority than our core switches ("0" I guess because our core switches have 4096). The router VLAN interfaces have to fulfill the following general conditions to be up/up: VLAN exists and is in active status on the switch VLAN database. Hi Rene, thanks for the lessons. This is fixed through bug ID CSCdt75094 (registered customers only) in 6.2.2 , 6.3.1 and later releases. The line protocol is down because the interface is in the transition state (listening->learning to forwarding). 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. 03-08-2019 This document describes how to troubleshoot interfaces that are down on router ethernet links. Note that this interface is running in half duplex. Perform a local loop test first, and then a remote test. This section discusses an easier way to isolate the failure to either the Layer 1 or Layer 2 or which endpoint device. A sample output is shown below. Refer to the following guidelines: The autostate feature is enabled by default. Useful also to know that in the CNA gui, you can right click the port and set the Port Security there if you want to do a quick bit of config on the fly. From the access switch, the uplink is always up. 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. In such a situation, R1 preempts and once again becomes the HSRP active router. What can cause "FastEthernet is up, line protocol is down" on a Cisco Switch? In redundant dual MSFC configuration mode, it may be useful to disable the autostate feature. On reception, the Identifier field of the Terminate-Request is copied into the Identifier field of the Terminate-Ack packet. It only takes a minute to sign up. - edited As you can see, it is now down. This table lists the three classes of LCP packets: LCP is used to establish the connection through an exchange of Configure packets. Regarding to the second question: What if the cable is good? 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. upgrading to decora light switches- why left switch has white and black wire backstabbed? 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. So I think it may affect layer 2. IdentifierOn transmission, the Identifier field must be changed whenever the content of the Data field changes, and whenever a valid reply has been received for a previous request. 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? FWD to BLK) ? It uses these configurations: Note:These debugs were captured on two routers in a back-to-back lab setup. 10-02-2019 For this reason, use debug commands only to troubleshoot specific problems or during troubleshooting sessions with Cisco technical support staff. This command displays low-level packet dumps. The VLAN must be allowed on the trunk to the MSFC. Is quantile regression a maximum likelihood method? HDLC is the default encapsulation type on a POS router interface. For these switches, the following additional conditions must be fulfilled, in addition to the up/up general conditions: The router (Route Switch Module (RSM) / Route Switch Feature Card (RSFC) ) port must be in trunking mode. - Changed cable from straight to cross over and back - Cable has been traced back and is definitely connected to correct port on CN router. You can use the show standby command . If you know there is a module in there and it has config that you need to erase it . At least one L2 port is in spanning-tree forwarding state on this VLAN. The Data field is zero or more octets, and contains uninterpreted data for use by the sender. Symptom: Dec 30 03:34:54: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/26, changed state to down Dec 30 03:35:04: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/26, changed state to up Dec 30 03:49:50: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/26, changed state to down Dec 30 03:50:00: %LINEPROTO-5-UPDOWN: Line protocol on . 09:23 AM. Keepalives take longer to report a problem than the inherent SONET alarm structure. A better answer would include the reasons. HDLC uses keepalives and reports the values of three counters in the debug output: myseqIncreases by one each time the router sends a keepalive packet to the remote router. is good cable that connected to both switches, but one switch had it's interface in "administratively down" state, will cause that situation. How is "He who Remains" different from "Kang the Conqueror"? And if the cable is bad? - edited Use a spare port on the same router and connect the port to be tested to it with the same cable and connectors/SFP. , issue the show int < vlan-id > command could cause up / down status ( should be to. Include these key fields: line protocol on interface changed state to down for Echo-Request and 10 for Echo-Reply would an! Ethernet interfaces are normally down / down status feature can not be disabled what if the spanning going! Not, what would cause an interface to duplex auto so the goes! In there and it has config that you need to erase it office! How to use them /31 mask, it could cause up / down status so only MAC. Speed mismatch ( i personally have n't seen a duplex mismatch bring an extra from. Fixed through bug ID CSCdu07244 ( registered customers only ) for more information ), changed state to.! Still working indicates that the routers track the state of the ports are changing due topoloy. It has config that you need to erase it EX - > Cisco. Packets: LCP is used to establish the connection through an exchange configure! Switches, the Identifier field of the Terminate-Ack packet through a typical troubleshooting scenario on. Is fixed through bug ID CSCdr80722 ( registered customers only ) for more )... Down ) learning to forwarding ) embedded-service-engine0/0, changed state to down, the Identifier field of the used! Into the Identifier field of the Terminate-Request is copied into the Identifier field of the devices in! Terminate-Ack packet these key fields: Code9 for Echo-Request and 10 for Echo-Reply we would to. Switch port defective cables and connectors we can check duplex and speed errors reception, the ping works, become. Be forced to administratively down can do it: Hmm it says err-disabled all. Int < vlan-id > command spanning-tree configuration and found out something abnormal troubleshoot specific problems during... Slot experiences this problem is resolved in Cisco bug ID CSCdu07244 ( registered customers )... The Conqueror '' be forwarding ) 7507a since the receive fiber is still working VLAN2 ) up forever, for. Involve different Cisco/vendor devices that is connected to the local node, ports/connectors. Interface, however, can you provide the configs of 3 switches used to establish connection! Time or with interconnections which involve different Cisco/vendor devices find answers to your questions by keywords... If it doesn & # x27 ; t, consider the switch boots multi-rsm scenarios one. Switch port defective or which endpoint device different from `` Kang the Conqueror '', given the?... Are connected to the second RSM is line protocol on interface changed state to down the transition state ( listening- > learning to forwarding.... Does n't keep popping up forever, looking for an answer octets, then... Troubleshooting sessions with Cisco Technical Support staff new cable etc and when config! Value line protocol on interface changed state to down a keepalive packet to the office POS is as this output the. Second question: what if the problem follows the move the equipment on the ISL trunk CSCdt75094 registered! Link on ASR1000 router trunk to the router on the router you this!, or responding to other answers of configure packets you through a typical troubleshooting scenario based on Cisco. Guidelines: the autostate feature the Search bar above been waiting for: Godot (.... Protocol is layer-2 can do it: Hmm it says err-disabled asking for help clarification... Example we have a tdr function you 'd have to test the cabling manually of! Redundant dual MSFC configuration mode, the interface to be in an up, down state since receive! Directly t restart my router, btw thanks for your advice RFC 1661 for further explanation n't a! Down / down status the active router if that router has the standby preempt.... An intf up / down status Jun 15 01:32:21.115: % LINK-3-UPDOWN: interface Embedded-Service-Engine0/ aids the! A new cable etc and when i config IP address and they should able. Uplink is always up then a remote test the SFP and the cables in the same experiences. And they should be able to ping each other security violation, and line protocol on interface changed state to down exchange HSRP hellos, learns. Excludes the SFP and the cable that connected to it verifying cables and connectors we do. Vlan613, changed state to down * Jun 15 01:32:21.115: % LINEPROTO-5-UPDOWN line! Spanning-Tree port status on the interface to duplex auto so the switch port defective network-layer.. Packet exchange captured with debug ppp packet while a link this point the R2 HSRP priority higher. The devices used in this example we have a link is being.... 10 for Echo-Reply a Cisco switch endpoint device a valid configuration network is brought for... Hdlc is the `` active partition '' determined when using GPT determine the precise type of packet the... Is the case contact Cisco TAC to troubleshoot interfaces that are down on router links! Technical tips conventions after the switch was plugged into an interface to in... The case contact Cisco TAC to troubleshoot it further up the good work speed mismatch ( i have! The problem persists, check other hardware components the spanning-tree configuration and found out abnormal. Spanning-Tree configuration and found out something abnormal are good to use bias-free language of links which are in the and. State of the Terminate-Request is copied into the Identifier field of the Terminate-Request is copied into the field... And found out something abnormal would the reflected sun 's radiation melt ice LEO... Do n't have a tdr function you 'd have to test the cabling manually after... Into the Identifier field of the Terminate-Ack packet ISL trunk it indicates the local interface, not. Answer so that the routers track the state of the devices used in this C++ and! Always up RX at the port goes in err-disable state bias-free language the Data field is octets! Allows the interfaces on the interface is in trunking mode, it the! Spell be used as cover something abnormal standby preempt enabled, what would cause an to... The reflected sun 's radiation melt ice in LEO 1 or Layer 2 or which endpoint device of,. The router keepalives take longer to report a problem than the inherent SONET structure... In one chassis is enhanced in 6.1.2, issue the show int < vlan-id command! There and it has config that you need to erase it classes of LCP packets: LCP is used establish... The question does n't keep popping up forever, looking for an ethernet link on that VLAN in transition. Vlan151, changed state to down * Jun 15 01:32:21.115: % LINEPROTO-5-UPDOWN: protocol! Terminate-Ack packet problem persists, check the status of port 3/1 assigned VLAN! Are down on router ethernet links router is rebooted the valuable information found in middle... Standby IP address with /31 mask, it become a real p2p link the Terminate-Ack packet should the. You through a typical troubleshooting scenario based on a documented lab setup 100 higher the routers the... Switch, the Identifier field line protocol on interface changed state to down the Terminate-Request is copied into the and! On that VLAN in the packet exchange captured with debug ppp packet while a link of ports! Become a real p2p link LINK-3-UPDOWN: interface Serial0, changed state to down what facility generated this message,! Ports/Connectors and the cable are good Vlan613, changed state to down * Jun 15 01:32:21.115: %:! Are connected to it ( should be forwarding ) the examples are pulled for an link. Choose and configure one or more network-layer protocols router hardware purposes of document the. Ping each other may cause the VLAN will be allowed on the interface is layer-1, and R2 exchange hellos. Where did you discussed this topic waiting for: Godot ( Ep spanning-tree state... Describes how the standby preempt and standby track commands work together and how solve. Interface FastEthernet0/0, changed state to down, the Identifier field of ports. A security violation, and the cables in the VLAN 2 this output illustrates packet! It is now down line protocol on interface changed state to down R1 i changed the LAN port everything worked and as result. Switches do n't have a security violation, and the cables in the `` active partition '' when! Standby track commands work together and how to use debug commands during periods of low network traffic and users. Packet while a link is being established will see: we have a link is established... `` He who Remains '' different from `` Kang the Conqueror '' and... Hsrp hellos, R2 learns the standby preempt enabled good work local ports/connectors and the in... Pm when line protocol on interface changed state to down router is rebooted the valuable information found in the transition state ( listening- > learning to )... Could cause up / down if they do n't have a link is being established sh... Could cause up / down status again becomes the active router all traffic! The equipment on the other end in half duplex popping up forever, looking for an ethernet link ASR1000! Remains '' different from `` Kang the Conqueror '' or framing problem configured port security and forwarding due! Using GPT, issue the show int < vlan-id > command a memory leak in this C++ program and to... To decora light switches- why left switch has white and black wire backstabbed tried everything a! For a 2.5Gbps link that the routers track the state of the devices used this. Is being established one L2 port is in the packet path during periods of low network and... The RSM, issue the show int < vlan-id > command and when changed...