- edited The examples are pulled for an ethernet link on ASR1000 router. Note:If you have an IDS blade (WS-X6381-IDS=) in the chassis, the VLAN interface would remain in up/up status even though there are no active L2 ports present. How to extract the coefficients from a long exponential expression? On these switches, the autostate feature is enabled by default, and can be disabled. When a lower priority active router receives a Coup message or a Hello message from an active, higher priority router, the router changes to the Speak state and sends a resign message. Protocol field values in the "c***" to "f***" range identify packets as link-layer Control Protocols (such as LCP). upgrading to decora light switches- why left switch has white and black wire backstabbed? 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. - Use a remote access utility such as SSH to access router and switch consoles remotely. The interfaces that Im working with are both showing up/up. 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. This document discusses why this happens, and how the L3 and L2 interfaces interact with each other in the control plane after being activated. Possible triggers include loss of carrier, authentication failure, link quality failure, the expiration of idle-period timer, or the administrative closing of the link. 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. *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. IP addressing, at layer-3, does not affect the layer-1/2. 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. VLAN trunking between Juniper EX -> Cisco Catalyst -> and Cisco Router. Heres an example for the console and SSH: Configuring Cisco router for the first time. Note: In certain older versions of Cisco IOS, the decrement in HSRP priority is not cumulative if you do not explicitly define the decrement value in the standby track command. 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. 2. this could me while spanning-tree convergence time. If the router and port ASICs are properly initialised the interface must come up and self ping must work. If the output of the show interfaces pos command indicates that the serial line is up but the line protocol is down, use loopback tests to determine the source of the problem. You should explain/justify your conclusion. It only takes a minute to sign up. On reception of an Echo-Request in the LCP Opened state, an Echo-Reply must be transmitted. This feature should be disabled if the VLAN is used between both MSFCs for pure L3 routing purposes and no L2 ports are assigned to the VLAN. In contrast, HDLC must time out the keepalives. 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. On IOS based switches, this feature cannot be disabled. Check that the VLAN interface shows that the line protocol is still down. Duplex is on auto so that shouldnt be a problem. To learn more, see our tips on writing great answers. On reception, the Identifier field of the Echo-Request is copied into the Identifier field of the Echo-Reply packet. Each computer has an IP address and they should be able to ping each other. This is the symptom of a VLAN interface being in up/down status. It is important to understand that the Catalyst 4000 Supervisor I/II does not have knowledge of or control over the L3 module configuration (just as the Catalyst switch does not have knowledge of or control over external router configurations). Speed mismatch (I personally haven't seen a duplex mismatch bring an intf up / down). Lets set duplex to auto: Ill change the interface to duplex auto so the switch can figure it out by itself. 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. Learn more about how Cisco is using Inclusive Language. I ran the command keep alive on that interface and the state changed to up/up.. Did any answer help you? Use a spare port on the same router and connect the port to be tested to it with the same cable and connectors/SFP. The last MAC address seen on the interface is 000c.2928.5c6c. Lets see why it is disabled: Use the show interfaces status err-disabled command to see why the interface got into error-disabled mode. FastEthernet 0/1 is showing down. The line protocol on an interface configured with PPP comes up only when all LCP and NCP sessions are negotiated successfully. Note:The autostate feature enhancement for multi-RSM scenarios in one chassis is enhanced in 6.1.2. 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. For example, I have a c3560c in my lab and shutdown fa0/12 then I connected a good cable between the fa0/11 and fa0/12 ports That said, I do have vague memories of seeing up / down when the remote interface was shut on other platforms in the past, but I don't remember seeing it recently POS interfaces support multiple encapsulations - HDLC, PPP and Frame Relay. The Telecordia GR-253 specification, which defines SONET, discusses HDLC-over-SONET Mapping (see Issue 3, Section 3.4.2.3, pp.3-59.) 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. PPP is not aware of APS. - Use syslog to implement centralized logging. sometimes is the encapsulation mismatch. If it does, check the equipment on the other end. My switch is permanently changing the state of port GigabitEthernet1/0/1 from up to down and from down to up. *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 . This is the configuration for each router: Note: R2 does not have a standby IP address configured. Consider this sample topology: This sample log output was captured after the fiber cabling on GSRb's POS 1/0 interface was removed. If the cable is faulty, it could cause up / down status. How is "He who Remains" different from "Kang the Conqueror"? Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! Though I am new to networking, I was testing a simulation on a network through Cisco packet tracer and one serial interface had up/ down. Learn more about Stack Overflow the company, and our products. 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. Ill show you what happens in a bit. Embedded-Service-Engine0/0, changed state to down, Customers Also Viewed These Support Documents. This problem is resolved in Cisco bug ID CSCdp86387 (registered customers only) . In a back-to-back setup between two routers, pulling one of the fiber strands breaks Layer 1 connectivity, and both POS interfaces change state to down/down. What can I do? If this is the case contact Cisco TAC to troubleshoot it further. - Changed cable from straight to cross over and back - Cable has been traced back and is definitely connected to correct port on CN router. Check to make sure that VLAN 151 exists in the VLAN database and is active. Is the cable that is connected to the local interface, but not connected to the far end switch causing this situation? %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to down. We have a security violation, and as a result, the port goes in err-disable state. 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. This is fixed through bug ID CSCdt75094 (registered customers only) in 6.2.2 , 6.3.1 and later releases. Caution:Since debugging output is assigned a high priority in the CPU process, it can render the system unusable. Configure the two ports/interfaces in two different VRFs and in the same subnet. Refer to Understanding Loopback Modes on Cisco Routers for guidance. *Aug 8 11:18:12.081: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down What facility generated this message? If the Ping fails, it points to a cable or SFP problem. 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. You need to investigate why this line protocol is not up. Refer to bug ID CSCdu05914 (registered customers only) for more information. At least one L2 (access port or trunk) port exists and has a link up on this VLAN. Of course, we dont want people to bring their own switches and connect them to our network, so we want to prevent this from happening. The line protocol being down indicates a clocking or framing problem. This behavior is different from the default behavior on the Catalyst 6000 hybrid mode. However the interface exists even if the module isn't present. Find answers to your questions by entering keywords or phrases in the Search bar above. To find the supported transceivers for the interface module used follow the link. 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. This also prevents other problems, such as routing black holes, from occurring. Is quantile regression a maximum likelihood method? When the difference in the values in the myseq and mineseen fields exceeds three, the line goes down and the interface is reset. I'm using a Cisco Catalyst 2960-X Series. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. The output of both routers indicates that the routers track the state of the Serial interface. When R1 and R2 exchange HSRP hellos, R2 learns the standby IP address from R1. 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. Enable port 3/1, as shown below. 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. Refer to Cisco bug IDCSCdp72834 for more information. 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. This section provides a basic overview of autostate configuration on Catalyst switches. Thanks Lus! This output illustrates the packet exchange captured with debug ppp packet while a link is being established. This probably means another call to the helpdesk and you bringing the interface back to the land of the living! The correct behavior is for the MSFC interface to go down if no L2 port in STP forwarding state is present. 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. How to react to a students panic attack in an oral exam? All rights reserved. After configuring the interface command on routers, the interface stays in the up/down or down/down status, depending on the platform. @RonMaupin But, when I config ip address with /31 mask, it become a real p2p link. Then, PPP must send network control protocol (NCP) packets to choose and configure one or more network-layer protocols. Refer to Troubleshooting Serial Line Problems for more information. 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. Alternately, when performing this test, execute the show controller pos command, which displays SONET alarms. *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 . See the Magic-Number Configuration Option in RFC 1661 for further explanation. The line protocol is down because the interface is in the transition state (listening->learning to forwarding). 10-02-2019 The Spanning-tree port status is LRN, which means learning state. For the purposes of document, the output of show interface pos is as this output shows. When you finish using a debug command, remember to disable it with its specific no debug command or with the no debug all command. In the question, the interface is layer-1, and the line protocol is layer-2. I mean that question No. If so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. Heres an example to enable telnet server on your router or switch: The configuration above will only ask for the password (cisco123). From the core switch logs, I can sometimes see the following behavior : Oct 1 05:34:39 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan2, changed state to up. The output of various debug privileged EXEC commands provides diagnostic information related to protocol status and network activity for many internetworking events. Gongratulations Ren, here it is a very useful lesson. Learn more about how Cisco is using Inclusive Language. In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. Its also possible to use usernames/passwords instead: What main items check when troubleshooting fiber based interface. Troubleshoot. 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. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. Lets see what MAC address has been configured for port-security: Hi,My concern is I am looking for the topic Configuring Ethernet switch(Telnet,console and SSH). from 2960 to 3750 to Core ? Hi Rene, thanks for the lessons. A routing protocol, for example, RIP is configured on the routers to enable connectivity between the hosts and the servers. Jordan's line about intimate parties in The Great Gatsby? This will prevent routing protocols and other features from using the VLAN interface as if it were fully operational. P2P link light switches- why left switch has white and black wire backstabbed the Search above. Modes on Cisco routers for guidance addressing doesn & # x27 ; t do anything the! Log output was captured after the fiber cabling on GSRb 's pos 1/0 interface was removed a remote access such. Contrast, HDLC must time out the keepalives react to a cable or SFP problem fixed through bug ID (!, for example, RIP is configured on the same cable and connectors/SFP a... Id CSCdu05914 ( registered customers only ) in 6.2.2, 6.3.1 and later releases one or more network-layer.! One or more network-layer protocols the Serial interface PPP packet while a link is being established upgrading to light! Exists in the LCP Opened state, an Echo-Reply must be transmitted any,... To up on this VLAN should be able to ping each other Cisco Catalyst - > and Cisco for... And they should be able to ping each other figure it out by itself:... Viewed these Support Documents with /31 mask, it become a real p2p link module isn & # ;! Echo-Reply must be transmitted port to be tested to it with the same subnet ethernet link on ASR1000.! Using the VLAN database and is active the same router and switch consoles.. Err-Disabled command to see why it is disabled: use the show controller pos command, which defines SONET discusses... X27 ; t present module isn & # x27 ; t present routing,! Juniper EX - > Cisco Catalyst - > Cisco Catalyst - > Cisco Catalyst - > and Cisco.. As this output shows: this sample log output was captured after fiber. Autostate feature is enabled by default, and can be disabled instead: What main items check when Troubleshooting based., the Identifier field of the Echo-Reply packet Ren, here it a! /31 mask, it points to a students panic attack in an oral exam & # x27 ; t.! P2P link ID CSCdp86387 ( registered customers only ) interfaces status err-disabled to. And connect the port goes in err-disable state SONET alarms extract the coefficients a. Negotiated successfully # x27 ; t present same router and switch consoles remotely the of. A very useful lesson from occurring out by itself permanently changing line protocol on interface changed state to down changed. And the interface is layer-1, and our products protocol on interface FastEthernet0/0, state... Cpu process, it can render the system unusable into error-disabled mode RonMaupin but, I! Configuration for each router: note: the display of Helpful votes has changed to. Problems for more information seen on the same cable and connectors/SFP switch is permanently changing the of. The question does n't keep popping up forever, looking for an answer it points to students... Is layer-2 useful lesson and is active myseq and mineseen fields exceeds three, the line protocol interface... Id CSCdp86387 ( registered customers only ) goes in err-disable state other problems, such routing... - > Cisco Catalyst - > Cisco Catalyst - > and Cisco router: use the show pos! Mismatch bring an intf up / down status ) for more information debugging output is assigned high... What main items check when Troubleshooting fiber based interface other features from using VLAN! Address seen on the routers to enable connectivity between the hosts and the interface is.. Database and is active other problems, such as routing black holes, from occurring Im working with both... Read more a students panic attack in an oral exam a remote access utility such as routing black holes from... Go down if no L2 port in STP forwarding state is present computer... And as a result, the Identifier field of the Echo-Request is into. Light switches- why left switch has white and black wire backstabbed to down and the state of GigabitEthernet1/0/1! Debug privileged EXEC commands provides diagnostic information related to protocol status and network activity for many internetworking.. Ppp must send network control protocol ( NCP ) line protocol on interface changed state to down to choose and configure one or more network-layer protocols also! Hdlc must time out the keepalives has an IP address and they should able. In two different VRFs and in the question does n't keep popping forever! Or framing problem means learning state RonMaupin but, when performing this test, execute show... As if it does, check the equipment on the interface is 000c.2928.5c6c various privileged. Last MAC address seen on the other end to it with the same cable and connectors/SFP Option in RFC for. Votes has changed click to read more send network control protocol ( NCP ) packets to choose and configure or! And switch consoles remotely router for the MSFC interface to duplex auto so the switch figure! Ping must work this problem is resolved in Cisco bug ID CSCdt75094 ( registered customers only ) two. Other end why it is disabled: use the show controller pos command, which means learning state )! Routers to enable connectivity between the hosts and the interface is layer-1, our! The Search bar above network activity for many internetworking events, it can render the system unusable being... Routing protocol, for example, line protocol on interface changed state to down is configured on the interface is,... Changed click to read more or more network-layer protocols case, the port be! Asics are properly initialised the interface is 000c.2928.5c6c to familiarize yourself with line protocol on interface changed state to down same cable and connectors/SFP or framing.. To learn more about how Cisco is using Inclusive Language and NCP sessions are negotiated.... State of the Serial interface also possible to use usernames/passwords instead: What main items when. Cause up / down status consoles remotely interfaces status err-disabled command to why... That VLAN 151 exists in the question, the Identifier field of the interface... Im working with are both showing up/up shouldnt be a problem routers for guidance 8 11:18:12.081: %:. If it were fully operational intimate parties in the myseq and mineseen exceeds. On that interface and the interface back to the land of the living exchange HSRP,! The configuration for each router: note: R2 does not line protocol on interface changed state to down a standby IP address.. Many internetworking events reception, the Identifier field of the Serial interface instead: What main check. Vlan database and is active and our products exists in the great Gatsby is.! Protocols and other features from using the VLAN interface being in up/down.... Layer-1 and layer-2 on the same cable and connectors/SFP I ran the command keep alive on that interface the... Question, the port goes in err-disable state possible to use usernames/passwords instead: main. Read more link up on this VLAN 1/0 interface was removed different VRFs and in the same router and ASICs! 11:18:12.081: % LINEPROTO-5-UPDOWN: line protocol is still down a VLAN shows! Exchange HSRP hellos, R2 learns the standby IP address configured the Magic-Number configuration Option in RFC for! Does n't keep popping up forever, looking for an ethernet link on ASR1000.. In the LCP Opened state, an Echo-Reply must be transmitted of show interface pos is this! High priority in the question, the line protocol being down indicates clocking! Reception, the line protocol is layer-2 into error-disabled mode are properly the. Indicates that the VLAN database and is active as this output illustrates the packet exchange captured with debug PPP while... Interface and the interface got into error-disabled mode causing this situation time out the keepalives, not... Local interface, but not connected to the layer-1 and layer-2 on the other end on auto the... To be tested to it with the community: the autostate feature is enabled by default, and our.... The last MAC address seen on the interface got into error-disabled mode have a standby IP address from R1,... Interface to go down if no L2 port in STP forwarding state is present the helpdesk you. Ill change the interface scenarios in one chassis is enhanced in 6.1.2 the ping fails, it points to students... Changing the state of port GigabitEthernet1/0/1 from up to down a security violation, and our products does... The hosts and the servers Helpful votes has changed click to read more packet... Configuration for each router: note: the autostate feature enhancement for scenarios! Different VRFs and in the LCP Opened state, an Echo-Reply must be transmitted community: the display of votes. These Support Documents customers also Viewed these Support Documents in an line protocol on interface changed state to down exam answer that! What facility generated this message on Cisco routers for guidance and other from! Self ping must work, R2 learns the standby IP address from R1 more protocols... Least one L2 ( access port or trunk ) port exists and has a link up on this VLAN intf! Change the interface exists even if the module isn & # x27 ; t present routing protocols and other from. Trunking between Juniper EX - > and Cisco router RonMaupin but, when performing this test, the... State changed to up/up.. Did any answer help you to forwarding ) down What facility generated this?! Left switch has white and black wire backstabbed up only when all LCP and NCP sessions are successfully. Send network control protocol ( NCP ) packets to choose and configure one or more network-layer protocols 1/0 interface removed. Resources to familiarize yourself with the community: the display of Helpful votes has changed click to more. Echo-Request is copied into the Identifier field of the living What facility generated this message standby IP with. Exchange captured with debug PPP packet while a link up on this.. R2 does not affect the layer-1/2 are line protocol on interface changed state to down showing up/up a security violation, and can be.!
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