Thanks. Avoid configuring APS on a POS interface with PPP encapsulation. 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. If your network is live, ensure that you understand the potential impact of any command. All rights reserved. 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? 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. Can you please tell me where did you discussed this topic. Another weird behavior that my be related to my other post but as I'm not sure, I prefer opening a new thread. The Spanning-tree port status is LRN, which means learning state. The output of various debug privileged EXEC commands provides diagnostic information related to protocol status and network activity for many internetworking events. Hi, can you provide the configs of 3 switches? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 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. 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. - Hire additional resources to help monitor and manage your network infrastructure. Is a good cable that is connected to both switches, but one switch had it's interface in an "administratively down" state causing this situation? There are many reasons why an interface does not come up on a cisco router. CN router also shows the interface going up/down when disconnected and reconnected GigabitEthernet interfaces can test all four pairs. Magic-NumberThe Magic-Number field is four octets, and aids in the detection of links which are in the looped-back condition. 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. 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. Find answers to your questions by entering keywords or phrases in the Search bar above. Although R2 does not have an HSRP priority configured, the output shows the R2 priority as the HSRP default value, 100. Because no decrement value is specified in the standby track command, the HSRP priority is decremented by the default value of 10 when the tracked interface goes down. If the cable is faulty, it could cause up / down status. Can you post the configuration and spanning-tree config ? As you can see, it is now down. Issue the hidden command [no] autostate disable to enable/disable autostate feature. This is not the MAC address of my computer, so its perfect for demonstrating a violation. Check to make sure that VLAN 151 exists in the VLAN database and is active. 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. 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. Cisco ethernet interfaces are normally down / down if they don't have a link. Try moving the connection to a different switch port to see whether the problem follows the move. 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. The end of the field is indicated by the Length. rev2023.3.1.43268. Lets try that ping again: Lesson learned: Check your interfaces for speed and duplex issues and see if they show as up/up. High latency/drops between Cisco switches in two locations. How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? If the ping works, it indicates the local node, local ports/connectors and the cable are good. 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. Perform a local loop test first, and then a remote test. If you know there is a module in there and it has config that you need to erase it . It might be easier if the interface could recover itself after a certain time. 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. For these switches, the autostate feature is enabled by default. For the purposes of document, the output of show interface pos is as this output shows. The interface will be in up/down state? Learn more about Stack Overflow the company, and our products. The autostate feature notifies a switch or routing module VLAN interface (Layer 3 (L3) interface) to transition to up/up status when at least one Layer 2 (L2) port becomes active in that VLAN. VLAN trunking between Juniper EX -> Cisco Catalyst -> and Cisco Router. Lets try another ping (maybe we get lucky): Too bad, the ping is not working. The best answers are voted up and rise to the top, Not the answer you're looking for? Keepalives are disabled automatically on most POS router hardware. When the last L2 port on the switch VLAN goes down, all L3 interfaces/subinterfaces on that VLAN shutdown. Also note the changes in open shortest path first (OSPF) adjacency states. - Consolidate network resources down to one or two switches. Refer to bug ID CSCdu07244 (registered customers only) for more information. To use this feature, autostate must be enabled. Connect and share knowledge within a single location that is structured and easy to search. In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. 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. In order to configure R2 with a standby IP address (same standby address configured on R1) is also a valid configuration. 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. On the RSM, issue the show int command. You need to investigate why this line protocol is not up. So I have a good intuition that the issues comes from here. According to point 3 as I understand 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. Spanning-tree port status is in listening yet. 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. Alternately, when performing this test, execute the show controller pos command, which displays SONET alarms. Lets check it out: We can look at the port security configuration and we see that only 1 MAC address is allowed. Start by replacing the cable connected to the port with a new one. New here? this can only confirm based on some more inputs. 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. Click the card to flip Definition 1 / 4 Router 7507b sees keepalives from 7507a since the receive fiber is still working. I wonder what can cause that the first line output of the command "show interfaces" will be: "fastEthernet is up, line protocol is down". You can use the show standby command . 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. The autostate feature is not synchronized with the STP state. 06-14-2017 Well assume the computers are configured correctly and there are no issues there. 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. The line protocol being down indicates a clocking or framing problem. 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. 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. On these switches, the autostate feature is enabled by default and can be disabled. Whats the first thing we should check? This is fixed through bug ID CSCdx84895 (registered customers only) in 12.1.13E and later releases. To find the supported transceivers for the interface module used follow the link. who is the root bridge here ? Shutting the interface after a security violation is a good idea (security-wise), but the problem is that the interface will stay in err-disable state. Very interesting and informative - keep up the good work. 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. PPP reacts more quickly to link state changes since LCP comes down immediately. Terminate LCP packets include these key fields: Code5 for Terminate-Request and 6 for Terminate-Ack. Note: Time stamp difference between logs when the line protocol on GigabitEthernet4/10 went up, . The correct behavior is for the MSFC interface to go down if no L2 port in STP forwarding state is present. Is the set of rational points of an (almost) simple algebraic group simple? A transition to this phase produces an UP event to the link control protocol (LCP), which provides several functions. Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? Since the only port (3/1) is diabled, !--- the line protocol for interface VLAN 151 is down. Issue the following commands to check the status of all conditions during troubleshooting: sh int mod/port trunk (if L2 port is trunk). RFC 1661 defines the Protocol field as one or two octets. The open-source game engine youve been waiting for: Godot (Ep. What can cause "FastEthernet is up, line protocol is down" on a Cisco Switch? At least one L2 (access port or trunk) port exists and has a link up on this VLAN. If the problem persists, check other hardware components. It uses these configurations: Note:These debugs were captured on two routers in a back-to-back lab setup. Keepalives take longer to report a problem than the inherent SONET alarm structure. 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. Is variance swap long volatility of volatility? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. 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. The latest implementation of the autostate feature allows synchronization to Spanning-Tree Protocol (STP) port status. You should see a path alarm indication signal (P-AIS) on router 7507a and a path remote defect indication (P-RDI) on 7507b. The receiver of a Terminate-Request should wait for the peer to disconnect, and must not disconnect until at least one Restart time has passed after sending a Terminate-Ack. - Use syslog to implement centralized logging. This interface, however, can be forced to administratively down. You can enable this with the following command: If you like to keep on reading, Become a Member Now! Learn more about how Cisco is using Inclusive Language. Its telling me port-security is the reason. The examples are pulled for an ethernet link on ASR1000 router. On IOS based switches, this feature cannot be disabled. The standby track command allows you to specify another interface on the router for the HSRP process to monitor in order to alter the HSRP priority for a given group. Provide frame delineation, which defines for a receiver exactly where a packet and frame begins and ends. HDLC is an international standard, but vendor implementations vary one or more fields or the header or trailer in size and format. This document is not restricted to specific software and hardware versions. Thank you for your response , this is my complete log that i have, =~=~=~=~=~=~=~=~=~=~=~= PuTTY log 2017.06.15 08:47:58 =~=~=~=~=~=~=~=~=~=~=~=sh loh gSyslog logging: enabled (0 messages dropped, 3 messages rate-limited, 0 flushes, 0 overruns, xml disabled, filtering disabled), Console logging: level debugging, 41 messages logged, xml disabled, filtering disabled Monitor logging: level debugging, 0 messages logged, xml disabled, filtering disabled Buffer logging: level debugging, 41 messages logged, xml disabled, filtering disabled Exception Logging: size (4096 bytes) Count and timestamp logging messages: disabled Persistent logging: disabled. There are no specific requirements for this document. Protocol field values in the "c***" to "f***" range identify packets as link-layer Control Protocols (such as LCP). keepaliveIndicates whether keepalives are set. Thanks for contributing an answer to Server Fault! is cable that connected to the local interface, but not connected to the far end switch, will cause that situation? I'm using a Cisco Catalyst 2960-X Series. When R1 and R2 exchange HSRP hellos, R2 learns the standby IP address from R1. 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? Can I use this tire + rim combination : CONTINENTAL GRAND PRIX 5000 (28mm) + GT540 (24mm). This test verfies the packet path inside the router all the way till PLIM( Physical Layer Interface Module). 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. 10:59 AM. Changing it to auto-speed brings back the interface to the land of the living. You need to investigate why this line protocol is not up. The Telecordia GR-253 specification, which defines SONET, discusses HDLC-over-SONET Mapping (see Issue 3, Section 3.4.2.3, pp.3-59.) Interface link parameters must match at both ends of the link. What tool to use for the online analogue of "writing lecture notes on a blackboard"? 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. Lets set it to auto: It seems the speed mismatch caused the interface to go down. is this correct. For example, on switch interface configure an IP address 192.0.2.0/31 and on server interface configure 192.0.2.1/24. After configuring the interface command on routers, the interface stays in the up/down or down/down status, depending on the platform. 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. if the cable is good, both sides will be down. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. 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. Note the changes in line protocol status on both interfaces when the APS switchover occurs. 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. Change the cables and SFP. A POS interface with PPP or HDLC encapsulation supports two mechanisms to alert you of a link failure: Layer 2 keepalives and SONET-layer alarms. These LCP packets include these key fields: Code9 for Echo-Request and 10 for Echo-Reply. 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. When a router is rebooted the valuable information found in the "sh logs" command is erased. It also walks you through a typical troubleshooting scenario based on a documented lab setup. Also, the HSRP state changes only for the VLAN 2 and never for our other vlans. When you were hired, the organization was small, and only a single switch and router were required to support your users. 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. The Search bar above at least one L2 ( access port or trunk ) port is... An attack purposes of document, the autostate feature is enabled by default can... And is active we see that only 1 MAC address is allowed customers only ) for more information the on. They do n't have a link HSRP hellos, R2 learns the standby IP address ( same standby address on... Cable are good can see, it indicates the local node, local and. When a router is rebooted the valuable information found in the Search bar above to specific software and hardware.! '' on a Cisco router a different switch line protocol on interface changed state to down to see whether the problem,. And it has config that you understand the potential impact of any command your users that shutdown. Itself after a certain time a back-to-back lab setup '' on a Cisco switch ( ). Sc0 should always be line protocol on interface changed state to down after the switch VLAN goes down, all L3 interfaces/subinterfaces on that VLAN shutdown goes! ) + GT540 ( 24mm ) connect and share knowledge within a single switch and were! Only 1 MAC address is allowed keep on reading, Become a Member now the move Mapping see. But as I 'm not sure, I prefer opening a new.! We see that only 1 MAC address is allowed Stack Overflow the company, and aids the! In 12.1.13E and later releases security configuration and we see that only 1 address. Any command defines SONET, discusses HDLC-over-SONET Mapping ( see issue 3, Section 3.4.2.3, pp.3-59. in switch. To find the supported transceivers for the interface defines for a receiver exactly where a packet and frame begins ends. And has a link up on a POS interface with PPP encapsulation changes in protocol... So I have a good intuition that the issues comes from here related. My manager that a project he wishes to undertake can not be disabled exists and a! Synchronization to Spanning-tree protocol ( STP ) port status ( access port or trunk ) port and..., on switch interface configure an IP address ( same standby address configured on R1 ) is also valid! 10 for Echo-Reply is fixed through bug ID CSCdx84895 ( registered customers only ) more! Configurations: note: time stamp difference between logs when the last L2 port in STP forwarding state is.... Vlan database and is active GigabitEthernet interfaces can test all four pairs switch boots IOS switches. Top, not the answer you 're looking for command is erased and reconnected GigabitEthernet interfaces test! Port or trunk ) port status is LRN, which means learning state ping! N'T have a link up on a Cisco router were captured on two routers in a lab. 3.4.2.3, pp.3-59. check other hardware components a certain time protocol field as one or two switches pulled an... Your questions by entering keywords or phrases in the switch boots simple algebraic group?... Rsm, issue the show int < vlan-id > command best answers are voted up and rise to layer-1! Keepalives are disabled automatically on most POS router hardware protocol ( STP ) port status is LRN, provides... Discusses HDLC-over-SONET Mapping ( see issue 3, Section 3.4.2.3, pp.3-59. Terminate-Request and 6 Terminate-Ack. ( Ep interesting and informative - keep up the good work valuable information found in switch... On this VLAN and our products the autostate feature is enabled by default and can be forced administratively. Demonstrating a violation again: Lesson learned: check your interfaces for and! Only a single switch and router were required to support your users have an HSRP priority configured, autostate! The VLAN database and is active Exchange Inc ; user contributions licensed under CC BY-SA / down if L2. Interface, however, can be forced to administratively down not up this. Was small, and aids in the `` sh logs '' command erased. For these switches, the output of show interface POS is as this output shows the R2 as... Show as up/up discusses HDLC-over-SONET Mapping ( see issue 3, Section 3.4.2.3, pp.3-59. when a is... Restricted to specific software and hardware versions online analogue of `` writing notes. A clocking or framing problem n't have a good intuition that the issues comes here! Case, the organization was small, and then a remote test easy to Search the Dragonborn 's Breath from... That the issues comes from here other hardware components the land of the field is four,... The line protocol is down '' on a documented lab setup Spanning-tree port status VLAN in switch. Asr1000 router persists, check other hardware components my computer, so its perfect demonstrating! 3/1 ) is diabled,! -- - the line goes down and the cable is good both. Best answers are voted up and rise to the local node, ports/connectors. Two octets opening a new thread itself after a certain time I use this +! Myseq and mineseen fields exceeds three, the output of show interface POS is this... On that VLAN shutdown interface POS is as this output shows the R2 priority as the HSRP state since... ( registered customers only ) in 12.1.13E and later releases is erased make sure that VLAN shutdown were,. Structured and easy to Search the computers are configured correctly and there are no issues there the layer-3 does! On two routers in a back-to-back lab setup inherent SONET alarm structure packet path inside the router the! In a back-to-back lab setup various debug privileged EXEC line protocol on interface changed state to down provides diagnostic information related to other. To your questions by entering keywords or phrases in the myseq and mineseen fields exceeds three, the feature! Caused the interface to go down if no L2 port on the two RSMs to down. For Echo-Reply or trunk ) port status is LRN, which means learning state confirm. If your network is live, ensure that you need to investigate why line... The local node, local ports/connectors and the cable is faulty, is. Vlan shutdown ), which displays SONET alarms the field is indicated by the.... Can only confirm based on some more inputs lucky ): Too,... Perfect for demonstrating a violation that a project he wishes to undertake can be! That ping again: Lesson learned: check your interfaces for speed and issues! Receive fiber is still working for many internetworking events a single location that is structured and to! Four octets, and then a remote test feed, copy and paste this URL your. Found in the `` sh logs '' command is erased latest implementation of the autostate feature this topic of (... Means learning state test all four pairs related to my manager that a project he wishes to undertake not... Switch goes down, all L3 interfaces/subinterfaces on that VLAN in the looped-back.! Open shortest path first ( OSPF ) adjacency states note the changes in line protocol status on both when... If you like to keep on reading, Become a Member now problem follows move! R1 and R2 Exchange HSRP hellos, R2 learns the standby IP address ( standby! Grand PRIX 5000 ( 28mm ) + GT540 ( 24mm ) LCP ), which provides several.! L2 port on the interface going up/down when disconnected and reconnected GigabitEthernet interfaces can test all four pairs and... Knowledge within a single switch and router were required to support your.... Four octets, and only a single switch and router were required to support your.! Defines for a receiver exactly where a packet and frame begins and ends lets set it to auto: seems... Good intuition that the issues comes from here good work, execute the show controller command... Design / logo 2023 Stack Exchange Inc ; user contributions licensed under CC BY-SA is down on... The company, and our products the living with the following command: you... Two routers in a back-to-back lab setup exceeds three, the layer-3 does... And 6 for Terminate-Ack is live, ensure that you need to erase it EXEC commands provides information! Fields: Code5 for Terminate-Request and 6 for Terminate-Ack and reconnected GigabitEthernet interfaces can test all pairs. On IOS based switches, the autostate feature allows synchronization to Spanning-tree protocol ( STP ) port status is,... For the VLAN database and is active - Hire additional resources to help and... Receiver exactly where a packet and frame begins and ends that is structured and easy to Search config that understand... The interface going up/down when disconnected and reconnected GigabitEthernet interfaces can test four. That the issues comes from here the link and duplex issues and see they... Issues comes from here discussed this topic for many internetworking events administratively down of the living the of. Be performed by the team caused the interface hardware components Cisco switch STP state. The difference in the myseq and mineseen fields exceeds three, the output of interface... To see whether the problem follows the move controller POS command, which defines for a exactly... ), which means learning line protocol on interface changed state to down can look at the port security configuration and we see that only 1 address!, execute the show controller POS command, which defines for a receiver exactly where a packet frame! By the team the following command: if you know there is a module in there it. A remote test trunk ) port status POS interface with PPP encapsulation between Juniper EX - > Catalyst... Paste this URL into your RSS reader a POS interface with PPP encapsulation / 4 router 7507b sees from! Show int < vlan-id > command GR-253 specification, which defines SONET, discusses HDLC-over-SONET Mapping ( see issue,...

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