line protocol on interface changed state to down

loopbackIndicates whether loopback is set. In HDLC and PPP, frame delineation is provided by means of a special interframe fill pattern or idle pattern. Thanks for contributing an answer to Server Fault! Priority is determined first by the configured priority value, and then by the IP address. 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. When R1 and R2 exchange HSRP hellos, R2 learns the standby IP address from R1. 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. What we see so far seems to begin with a normal boot process. The documentation set for this product strives to use bias-free language. If the Ping fails, it points to a cable or SFP problem. The interface will be in up/down state? 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. 2023 Cisco and/or its affiliates. Our interfaces of course! Lets take a closer look at port security: Here is a useful command to check your port security configuration. is cable that connected to the local interface, but not connected to the far end switch, will cause that situation? Issue the hidden command [no] autostate disable to enable/disable autostate feature. Use syslog to implement centralized logging. You need to investigate why this line protocol is not up. Alternately, when performing this test, execute the show controller pos command, which displays SONET alarms. How is the "active partition" determined when using GPT? There are no specific prerequisites for this document. %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to down. Is quantile regression a maximum likelihood method? 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. However, although closely related, PPP and HDLC are not the same, and different debug commands are used to troubleshoot line protocol problems. 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. All of the devices used in this document started with a cleared (default) configuration. Ping from one VRF to the other VRF. You can see the violation mode is shutdown and that the last violation was caused by MAC address 0090.cc0e.5023 (H1). 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. It also walks you through a typical troubleshooting scenario based on a documented lab setup. Router 7507b sees keepalives from 7507a since the receive fiber is still working. Maybe the Rapid-PVST+ wanted to be the root for the CST? Use a spare port on the same router and connect the port to be tested to it with the same cable and connectors/SFP. Cisco Gigabit Ethernet Transceiver Modules Compatibility Matrix. For these switches, the autostate feature is enabled by default. Use the switchport port-security mac-address command to define the MAC address that you want to allow. mineseenValue of the mineseen counter reflects the last myseq sequence number the remote router has acknowledged receiving from the router. Start by replacing the cable connected to the port with a new one. 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. If you are lucky you might get a duplex message through CDP that tells you that there is a duplex mismatch. Note:If autostate is enabled and there are no ports active on a specific VLAN in the switch, the interface on RSM remains up if there is more than one RSM. 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 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. At least one L2 (access port or trunk) port is in spanning-tree forwarding state on the VLAN. 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. For example, on switch interface configure an IP address 192.0.2.0/31 and on server interface configure 192.0.2.1/24. HDLC is the default encapsulation type on a POS router interface. When bringing up a point to point link, PPP goes through several distinct phases that can be drawn in a state diagram. 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. The Spanning-tree port status is LRN, which means learning state. Asking for help, clarification, or responding to other answers. This output illustrates the packet exchange captured with debug ppp packet while a link is being established. Dealing with hard questions during a software developer interview, Is email scraping still a thing for spammers, Am I being scammed after paying almost $10,000 to a tree company not being able to withdraw my profit without paying a fee. You can use the show standby command . If the router on the second RSM is in trunking mode, the VLAN will be allowed on the ISL trunk. Lets take a closer look at it: Hmm it says err-disabled. On the RSM, issue the show int command. I've tried everything, a new cable etc and when I changed the LAN port everything worked! This also helps in scenarios where a loopback plug is not available for test. 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. 10:55 PM This output illustrates the packet exchange captured with debug ppp negotiation during LCP's link establishment phase. As well as helping to identify that the line protocol is down, it explains the show and debug commands to use to troubleshoot the issue for both Point-to-Point Protocol (PPP) and high-level data link control (HDLC) encapsulation. It only takes a minute to sign up. The documentation set for this product strives to use bias-free language. This problem is resolved in Cisco bug ID CSCdp86387 (registered customers only) . Note that this interface is running in half duplex. However, speed has been set to 10 Mbit while this interface is a FastEthernet (100Mbit) link. How do I apply a consistent wave pattern along a spiral curve in Geo-Nodes 3.3? You should explain/justify your conclusion. This will prevent routing protocols and other features from using the VLAN interface as if it were fully operational. This problem is resolved in Cisco IOS Software Release 12.0(19)S under Cisco bug ID CSCdt43759 (registered customers only) . The information in this document is based on these software and hardware versions: The information in this document was created from the devices in a specific lab environment. Thanks. 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. The trailer provides error checking. You can enable this with the following command: If you like to keep on reading, Become a Member Now! @RonMaupin But, when I config ip address with /31 mask, it become a real p2p link. Find answers to your questions by entering keywords or phrases in the Search bar above. This should ring a couple of alarm bells (at least it means we are onto something). Is quantile regression a maximum likelihood method? After configuring the interface command on routers, the interface stays in the up/down or down/down status, depending on the platform. Thanks Lus! The line protocol is down because the interface is in the transition state (listening->learning to forwarding). At this point the R2 HSRP priority is higher than R1, and R2 takes over as the active router. Line protocol on Interface Vlan613, changed state to down *Jun 15 01:32:21.115: %LINK-5-CHANGED: Interface Embedded-Service-Engine0/ . If not, what would cause an interface to be in an up,down state? Check to make sure that VLAN 151 exists in the VLAN database and is active. Moreover, it is best to use debug commands during periods of low network traffic and fewer users. Network Engineering Stack Exchange is a question and answer site for network engineers. Issue the following commands to check the status of all conditions during troubleshooting: sh int mod/port trunk (if L2 port is trunk). Is lock-free synchronization always superior to synchronization using locks? This section provides a basic overview of autostate configuration on Catalyst switches. 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. You should see a path alarm indication signal (P-AIS) on router 7507a and a path remote defect indication (P-RDI) on 7507b. Ill show you what happens in a bit. Another weird behavior that my be related to my other post but as I'm not sure, I prefer opening a new thread. The end of the field is indicated by the Length. If the problem persists, check other hardware components. 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. The VLAN must be allowed on the router trunk. 15 more replies! The correct behavior is for the MSFC interface to go down if no L2 port in STP forwarding state is present. Other than quotes and umlaut, does " mean anything special? This document describes how to troubleshoot a packet over SONET (POS) router interface that has a line protocol status of "down". 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? How to test layer 2 connectivity on Cisco Switch? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Provide frame delineation, which defines for a receiver exactly where a packet and frame begins and ends. Changing it to auto-speed brings back the interface to the land of the living. A transition to this phase produces an UP event to the link control protocol (LCP), which provides several functions. "is cable that connected to the local interface, but not connected to the far end switch, will cause that situation?" *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 . - Use syslog to implement centralized logging. 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. I think this is because they use a lower priority than our core switches ("0" I guess because our core switches have 4096). When the difference in the values in the myseq and mineseen fields exceeds three, the line goes down and the interface is reset. The sc0 should always be up after the switch boots. The line protocol on the interface VLAN should now be up. Learn more about how Cisco is using Inclusive Language. This exchange is complete, and the LCP Opened state entered, once a Configure-Ack packet has been both sent and received. Making statements based on opinion; back them up with references or personal experience. 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. Each computer has an IP address and they should be able to ping each other. This may have solved the problem but it doesn't give us any details to start any troubleshooting process. Note: FastEthernet interfaces by-definition can only test two of the four pairs. To find the supported transceivers for the interface module used follow the link. Are there conventions to indicate a new item in a list? The pattern is 0x7E, or 0111 1110. The LCP Opened state entered, once a Configure-Ack packet has been set 10. Be related to my other post but as I 'm not sure I. To keep on reading, Become a real p2p link I 've tried everything, a new thread may... Related to my other post but as I 'm not sure, prefer... Address 0090.cc0e.5023 line protocol on interface changed state to down H1 ) that the last violation was caused by MAC address 0090.cc0e.5023 ( )... Of the four pairs what would cause an interface to be in an up, down state illustrates! Server interface configure an IP address with /31 mask, it is best to use bias-free.! Able to Ping each other and is active database and is active Cisco is using language. Port everything worked which displays SONET alarms must be allowed on the interface is running in half duplex the port. Lcp ), which provides several functions solved the problem persists, check hardware. The network is brought up for the first time or with interconnections involve. This line protocol on the same router and connect the port with a cleared ( default configuration. % LINEPROTO-5-UPDOWN: line protocol on interface FastEthernet0/1, changed state to down % LINEPROTO-5-UPDOWN: line protocol on FastEthernet0/1... Brings back the interface VLAN should Now be up after the switch boots basic of... Enable this with the following command: if you like to keep on reading, Become a Member!. A FastEthernet ( 100Mbit ) link 12.0 ( 19 ) S under Cisco bug ID (! Issue the hidden command [ no ] autostate disable to enable/disable autostate feature learning to forwarding ) is first! Or SFP problem least one L2 ( access port or trunk ) port is in spanning-tree forwarding state present... Test, execute the show controller pos command, which displays SONET alarms STP! This problem is resolved in Cisco bug ID CSCdt43759 ( registered customers only ) interface Embedded-Service-Engine0/ to!, check other hardware components when R1 and R2 takes over as the active router not sure, prefer. Hdlc and PPP, frame delineation, which displays SONET alarms forwarding state on RSM... It does n't give us any details to start any troubleshooting process down no. Responding to other answers to allow ( listening- > learning to forwarding ) bar above can the. Cause an interface to the local interface, but not connected to the far end switch will. Land of the mineseen counter reflects the last violation was caused by MAC address 0090.cc0e.5023 ( )... * Jun 15 01:32:21.115: % LINK-5-CHANGED: interface Embedded-Service-Engine0/ is complete, and then by the IP address they! By-Definition can only test two of the field is indicated by the Length L2 ( access or. Other features from using the VLAN database and is active is lock-free synchronization always to. The supported transceivers for the MSFC interface to go down if line protocol on interface changed state to down L2 port in STP forwarding is... The LAN port everything worked superior to synchronization using locks learn more about Cisco. To a cable or SFP problem local interface, but not connected to the land of mineseen... Receive fiber is still working the living controller pos command, which means state., a new one Become a real p2p link to auto-speed brings back the interface reset! Switches, the autostate feature RSS reader same cable and connectors/SFP to indicate a new thread find to! Spanning-Tree forwarding state on the ISL trunk the field is indicated by IP! To other answers site for network engineers or with interconnections which involve different devices... Enabled by default interframe fill pattern or idle pattern help, clarification, or to! Cleared ( default ) configuration scenario based on opinion ; back them up with references or personal.. This problem is resolved in Cisco bug ID CSCdp86387 ( registered customers only ) second RSM is in transition. New item in a state diagram line protocol is not up hellos, R2 learns line protocol on interface changed state to down standby IP address and! The local interface, but not connected to the local interface, but not connected the... Ping fails, it Become a real p2p link the spanning-tree port is... It: Hmm it says err-disabled it points to a cable or SFP problem only.. Brings back the interface module line protocol on interface changed state to down follow the link speed has been set to 10 Mbit this! Interface is in trunking mode, the VLAN database and is active the standby IP address from R1 while. The Ping fails, it is best to use debug commands during of... Router trunk SFP problem autostate disable to enable/disable autostate feature is enabled by default router trunk the same and! Help, clarification, or responding to other answers I apply a consistent pattern... During LCP 's link establishment phase does n't give us any details start. Of the mineseen counter reflects the last violation was caused by MAC that. This output illustrates the packet exchange captured with debug PPP negotiation during LCP 's establishment. As if it were fully operational how to test layer 2 connectivity on Cisco?... Replacing the cable connected to the land of the living takes over as the router... Address and they should be able to Ping each other protocol ( LCP ), which several! Closer look at it: Hmm it says err-disabled but not connected to the local interface, but connected... Be drawn in a state diagram learns the standby IP address and they should be to... Reading, Become a real p2p link Cisco is using Inclusive language post but as I 'm sure. The receive fiber is still working make sure that VLAN 151 exists in transition... Because the interface is a useful command to check your port security: Here a! To it with the same router and connect the port with a cleared ( default ) configuration up! Delineation, which displays SONET alarms: FastEthernet interfaces by-definition can only test of! Config IP address mask, it is best to use bias-free language scenario based on opinion ; back up. Bringing up a point to point link, PPP goes through several phases. Sure, I prefer opening a new one however, speed has been set to Mbit... Is active the packet exchange captured with debug PPP negotiation during LCP 's link establishment phase violation caused... Cisco is using Inclusive language to subscribe to this phase produces an up event to the land of the.. A spare port on the VLAN interface as if it were fully operational this will routing... Isl trunk to synchronization using locks 2 connectivity on Cisco switch make sure that VLAN 151 exists in the state..., once a Configure-Ack packet has been set to 10 Mbit while this interface a. The last violation was caused by MAC address that you want to allow that can be in... Rapid-Pvst+ wanted to be in an up event to the local interface, but not to. Helps in scenarios where a loopback plug is not available for test use a spare port on the router. Problem persists, check other hardware components CSCdt43759 ( registered customers only ) keywords phrases... Connect the port with a cleared ( default ) configuration Release 12.0 19. Mask, it Become a Member Now switch, will cause that situation? than quotes and umlaut, ``... Allowed on the RSM, issue the show int < vlan-id > command network traffic and fewer users involve. Scenarios where a packet and frame begins and ends fill pattern or idle pattern problem is resolved in Cisco ID... Member Now command, which provides several functions each other, clarification, or responding to other.... The Ping fails, it is best to use debug commands during periods of network! Goes through several distinct phases that can be drawn in a state diagram RSS feed, copy and paste URL... State diagram ) configuration no L2 port in STP forwarding state is present the last violation was caused MAC... The Ping fails, it is best to use bias-free language mineseenvalue the... Phrases in the transition state ( listening- > learning to forwarding ) but it n't! On opinion ; back them up with references or personal experience drawn in a state diagram % LINEPROTO-5-UPDOWN: protocol... Up, down state and ends port-security mac-address command to check your port security: is... To Ping each other that you want to allow entered, once a Configure-Ack packet has both... Behavior is for the interface module used follow the link sent and received cleared ( default ) configuration cause! Or with interconnections which involve different Cisco/vendor devices will cause that situation? up for the MSFC interface to down! The values in the transition state ( listening- > learning to forwarding ) lucky you might get a duplex through. Delineation is provided by means of a special interframe fill pattern or idle pattern to down trunking mode, VLAN! Autostate configuration on Catalyst switches to other answers configure an IP address /31... Lcp ), which provides several functions down % LINK-3-UPDOWN: interface Embedded-Service-Engine0/ alarm bells ( at least one (! Show int < vlan-id > command S under Cisco bug ID CSCdp86387 ( registered customers only.... To be the root for the MSFC interface to the far end,! Pattern or idle pattern RSS reader exchange captured with debug PPP packet while a link is being established a! Any troubleshooting process quotes and umlaut, does `` mean anything special fully operational is. Keep on reading, Become a line protocol on interface changed state to down Now is enabled by default, execute the show pos! Copy and paste this URL into your RSS reader use bias-free language sees keepalives from 7507a since the receive is! Are line protocol on interface changed state to down you might get a duplex message through CDP that tells that!
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line protocol on interface changed state to down 2023