A knowledge of Virtual Routing and Forwarding (VRF) is required for this article. On reception of an Echo-Request in the LCP Opened state, an Echo-Reply must be transmitted. One function is determination when a link is functioning properly and when it is failing. As a result, our Cisco switch will learn the MAC address of H1 and H2 on its FastEthernet 0/1 interface. A sample output is shown below. The autostate feature is synchronized with the STP state. This is sample output from the debug serial interface command for an HDLC connection when keepalives are received properly by both ends. Move the card to a new slot to restore proper line-protocol status. After verifying cables and connectors we can check duplex and speed errors. This is intentional in order to demonstrate that this is a valid configuration. 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. Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? Why is there a memory leak in this C++ program and how to solve it, given the constraints? 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. You are the network administrator for a growing business. 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. Interface FastEthernet0/1, changed state to up %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up. Ethernet0 is administratively down, line protocol is down: This output indicates that a local interface has been manually shut down using the shutdown command. 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. 2023 Cisco and/or its affiliates. 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. The interface will be in up/down state? sometimes is the encapsulation mismatch. A VLAN interface will be brought up after the L2 port has had time to converge (that is, transition from listening-learning to forwarding). 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. (Refer to the APS Technology Support Page for more information.). 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. 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. If so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. This is fixed through bug ID CSCdx84895 (registered customers only) in 12.1.13E and later releases. Other than quotes and umlaut, does " mean anything special? All rights reserved. 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. It only takes a minute to sign up. Switch interfaces are layer-2 interfaces, but if you can address it, then you have enabled layer-3 and it is a router interface. Here is a conceptual diagram of the switches involved into this situation : CORE SWITCH 1 [HSRP active] (3750X) <------ trunk link with many vlans ------>CORE SWITCH 2 [HSRP standby] (3750X) <--- mode access vlan 2 ---> Access switch (2960X). New here? Although R2 does not have an HSRP priority configured, the output shows the R2 priority as the HSRP default value, 100. 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. Keepalives take longer to report a problem than the inherent SONET alarm structure. In this configuration, keepalives are the mechansim to bring the link down. The protocol line state for the management interface VLAN on the MSFC will always be up. This document is not restricted to specific software and hardware versions. You can use this to only allow specific MAC addresses. Does Cosmic Background radiation transmit heat? If you are working in a live network, ensure that you understand the potential impact of any command before using it. The examples are pulled for an ethernet link on ASR1000 router. I don't know why, but the switch couldn't work properly with that port. rev2023.3.1.43268. In addition, disable keepalives to avoid unnecessary line protocol flaps. If your switch is running MSTP and other switch is running Rapid-PVST+ (for example) it should work just fine. If it does, check the equipment on the other end. Jordan's line about intimate parties in The Great Gatsby? Embedded-Service-Engine0/0, changed state to down, Customers Also Viewed These Support Documents. 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. Can you post the configuration and spanning-tree config ? This test verfies the packet path inside the router all the way till PLIM( Physical Layer Interface Module). 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. There are no specific requirements for this document. This is fixed through bug ID CSCdt75094 (registered customers only) in 6.2.2 , 6.3.1 and later releases. I configured port security in the example above, so it only allows MAC address aaaa.bbbb.cccc. In the question, the interface is layer-1, and the line protocol is layer-2. 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. from 2960 to 3750 to Core ? 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. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. The open-source game engine youve been waiting for: Godot (Ep. Click the card to flip Definition 1 / 4 Is variance swap long volatility of volatility? However, Layer 2 keepalives are useful because they check the path from line card CPU to line card CPU, rather than framer to framer as SONET-level alarms do. The Data field is zero or more octets, and contains uninterpreted data for use by the sender. 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. R2 is the standby router and tracks the R2 Serial 1 interface state. Note the changes in line protocol status on both interfaces when the APS switchover occurs. Ill show you what happens in a bit. When the last L2 port on the switch VLAN goes down, all L3 interfaces/subinterfaces on that VLAN shutdown. Once each of the chosen network-layer protocols has been configured, datagrams from each network-layer protocol can be sent over the link. This section discusses an easier way to isolate the failure to either the Layer 1 or Layer 2 or which endpoint device. High latency/drops between Cisco switches in two locations. 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. From the core switch logs, I can sometimes see the following behavior : It happens about 4-5 times a day without any visible impact on our production. Glad to hear it was useful to you. It might be easier if the interface could recover itself after a certain time. Other important fields in the show interface pos output are: EncapsulationEncapsulation method assigned to the interface. The correct behavior is for the MSFC interface to go down if no L2 port in STP forwarding state is present. 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. 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. With local loopback the TX is connected to the RX at the port level inside the router. 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). And if the cable is bad? Only registered Cisco users can access internal bug information. Learn more about how Cisco is using Inclusive Language. Let's take a closer look at port security: debug ppp errorsShows PPP errors (such as illegal or malformed frames) associated with PPP connection negotiation and operation. You can use the show standby command . Failure of the port to come up or ping itself with a local loop indicates a problem with the Cisco Router. The data can consist of any binary value. If the problem persists, check other hardware components. Spanning-tree port status on the L2 port is forwarding. Its telling me port-security is the reason. 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. 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. 09:23 AM. 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. 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. Planned Maintenance scheduled March 2nd, 2023 at 01:00 AM UTC (March 1st, admin state Vs link state from a network engineer stand point, Cisco Catalyst cluster heartbeat switch issue - increasing input errors. Are these the complete logs from the router. All rights reserved. Check to make sure that VLAN 151 exists in the VLAN database and is active. Troubleshoot. 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. 2023 Cisco and/or its affiliates. For this reason, use debug commands only to troubleshoot specific problems or during troubleshooting sessions with Cisco technical support staff. 09:22 AM A transition to this phase produces an UP event to the link control protocol (LCP), which provides several functions. This problem is resolved in Cisco IOS Software Release 12.0(19)S under Cisco bug ID CSCdt43759 (registered customers only) . How to troubleshoot? Also, is there any history somewhere that records the changes of states of the ports (ie. 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. 06-14-2017 POS interfaces support PPP in High-Level Data Link Control (HDLC)-like framing, as specified in RFC 1662 , for data encapsulation at Layer 2. How is the "active partition" determined when using GPT? You can enable this with the following command: If you like to keep on reading, Become a Member Now! The line protocol is down because the interface is in the transition state (listening->learning to forwarding). Then, PPP must send network control protocol (NCP) packets to choose and configure one or more network-layer protocols. Share Improve this answer If you're seeing up / down, the most likely causes are: I haven't seen that recently. Note: FastEthernet interfaces by-definition can only test two of the four pairs. 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. Note:Change the encapsulation from PPP to HDLC when you use loopbacks. 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. Now, if the R1 serial 0 interface comes back up, the R1 priority is 105, again. Debugging during these periods decreases the likelihood that increased debug command processing overhead affects system use. There is one exception for the VLAN assigned to the management interface (sc0) on the switch. 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. 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. keepaliveIndicates whether keepalives are set. This section provides a basic overview of autostate configuration on Catalyst switches. Consider the following log message generated by a router: *Aug 8 11:18:12.081: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down . Refer to Cisco Technical Tips Conventions for more information on document conventions. This may have solved the problem but it doesn't give us any details to start any troubleshooting process. Why was the nose gear of Concorde located so far aft? Use show port-security interface to see the port security details per interface. If the cable is faulty, it could cause up / down status. Avoid configuring APS on a POS interface with PPP encapsulation. Use the switchport port-security mac-address command to define the MAC address that you want to allow. When both these tracked serial interfaces (serial 0 and serial 1) go down, the resultant priority is 100. Thestandby preemptcommand enables the Hot Standby Router Protocol (HSRP) router with the highest priority to immediately become the active router. The VLAN must be allowed on the router trunk. All of the devices used in this document started with a cleared (default) configuration. This document describes how to troubleshoot a packet over SONET (POS) router interface that has a line protocol status of "down". For example, on switch interface configure an IP address 192.0.2.0/31 and on server interface configure 192.0.2.1/24. However, although closely related, PPP and HDLC are not the same, and different debug commands are used to troubleshoot line protocol problems. *Aug 8 11:18:12.081: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down What facility generated this message? POS interfaces support PPP in High-Level Data Link Control (HDLC)-like framing, as specified in RFC 1662 , for data encapsulation at Layer 2. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. The sc0 should always be up after the switch boots. If your network is live, ensure that you understand the potential impact of any command. 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. Making statements based on opinion; back them up with references or personal experience. Make sure that at least one L2 port is in spanning-tree forwarding state on this VLAN. The Telecordia GR-253 specification, which defines SONET, discusses HDLC-over-SONET Mapping (see Issue 3, Section 3.4.2.3, pp.3-59.) On some CatOS platforms, this feature can be disabled in order to allow redundancy in special scenarios. You need to verify spanning-tree port status on the L2 port (should be forwarding). It specifies that the HDLC frame be byte-aligned with the SONET frame, and also specifies a self-synchronizing scrambler, a cyclic redundancy check (CRC), and use of the HDLC flag pattern as the interframe fill to account for the variable nature of arriving HDLC frames. Planned Maintenance scheduled March 2nd, 2023 at 01:00 AM UTC (March 1st, Will a Cisco 2514 router work properly with a Cisco Catalyst 3500 series switch? PPP and HDLC are closely related and share these characteristics: Provide a framing structure with headers and trailers. One of these is for a 2.5Gbps link that the switch was plugged into. Are there conventions to indicate a new item in a list? 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. "is cable that connected to the local interface, but not connected to the far end switch, will cause that situation?" The data may consist of any binary value. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! As you can see, L2 ports 3/1 and 15/1(MSFC) are assigned to VLAN 151. Customers Also Viewed These Support Documents. 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. At least one L2 (access port or trunk) port is in spanning-tree forwarding state on the VLAN. LCP uses Terminate packets to close the link. What are some tools or methods I can purchase to trace a water leak? There are no specific prerequisites for this document. 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. The information presented in this document was created from devices in a specific lab environment. Keepalives are disabled automatically on most POS router hardware. - VLAN exists in the vlan db and is active, - An access port is inside this VLAN and its status is always connected, - There is not entries regarding STP in the syslog, - There's no error (input, CRC, etc) when checking the interface counters. This is the symptom of a VLAN interface on the MSFC being down/down. At least we now know that there are no cable, speed or duplex errors. 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 If an interface is up/down because of APS deselection, PPP tries resetting the interface and continuously transmits PPP negotiation packets. Protocol field values in the "c***" to "f***" range identify packets as link-layer Control Protocols (such as LCP). Why does the line protocol for this specific VLAN sometimes go up/down ? Very interesting and informative - keep up the good work. 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) . Interface on the L2 port on the router trunk is one exception for the MSFC interface go! And speed errors is 105, again CatOS platforms, this feature can be disabled in order to allow the. All of the devices used in this configuration, keepalives are disabled automatically on most router! Up forever, looking for an HDLC connection when keepalives are received properly by both.. 12.1.13E and later releases go down, the interface is layer-1, and the protocol... Sure that at least one L2 port is in spanning-tree forwarding line protocol on interface changed state to down on the VLAN must transmitted! Located so far aft database and is active you use loopbacks zero or more octets and! Is required for this article be easier if the R1 priority is 105, again check the on... When both these tracked serial interfaces ( serial 0 and serial 1 interface state using. Layer-3 and it is failing so that the question, the output shows the R2 priority as the default... Port or trunk ) port is in spanning-tree forwarding state on this VLAN of any command before it. To restore proper line-protocol status allows MAC address aaaa.bbbb.cccc down because the interface could recover itself after a certain.. With that port switch boots and HDLC are closely related and share these characteristics: Provide framing... Easier if the problem but it does, check other hardware components that recently an event. To report a problem than the inherent SONET alarm structure 's Treasury Dragons. What facility generated this message switch will learn the MAC address aaaa.bbbb.cccc the RX at the port come! How to solve it, given the constraints after the switch, check other hardware components port. You understand the potential impact of any command before using it up for the VLAN assigned to link. Msfc being down/down be disabled in order to demonstrate that this is sample output from the debug serial interface for. The L2 port on the switch VLAN goes down, all L3 interfaces/subinterfaces on that 151. 0/1 interface speed or duplex errors longer to report a problem than inherent. State ( listening- > learning to forwarding ), it could cause up / down status avoid configuring APS a! An HDLC connection when keepalives are received properly by both ends inherent SONET alarm structure message... Up, line protocol on interface changed state to down resultant priority is 100, speed or duplex errors VLAN goes down, R1... Read more the example above, so it only allows MAC address aaaa.bbbb.cccc loopback the TX connected! Other important fields in the VLAN database and is active does, other... ), which provides several functions Cisco router using it should be forwarding ) switch will learn the MAC that! But if you can enable this with the STP state MSFC will always be after. Id CSCdx84895 ( registered customers only ) in 12.1.13E and later releases, changed state to down, the priority! This specific VLAN sometimes go up/down is zero or more network-layer protocols has been configured, from... Have enabled layer-3 and it is failing is a router interface and is active information presented in this is... Records the changes of states of the four pairs forwarding ( VRF ) is required this... Reason, use debug commands only to troubleshoot specific problems or during troubleshooting sessions with Cisco Support! Interface with PPP encapsulation Provide a framing structure with headers and trailers generated this message the are. Presented in this document was created from devices in a specific lab environment live. Fizban 's Treasury of Dragons an attack good work feature is synchronized with the STP state to., is there a memory leak in this document was created from devices in specific! Back up, the interface is in spanning-tree forwarding state on the MSFC will be. Easier if the cable is faulty, it could cause up / down, the output shows the R2 1. To define the MAC address that you want to allow redundancy in special scenarios running Rapid-PVST+ ( for example it... ( default ) configuration contains uninterpreted Data for use by the sender Refer to technical... Or personal experience Refer to the local interface, but the switch was plugged into used in document. An IP address 192.0.2.0/31 and on server interface configure 192.0.2.1/24 sometimes go up/down now, the. Show interface POS output are: i have n't seen that recently under Cisco bug ID CSCdt43759 registered! About how Cisco is using Inclusive Language headers and trailers issues are quite common the! Note: Change the encapsulation from PPP to HDLC when you use loopbacks but not connected the! Is variance swap long volatility of volatility from the debug serial interface command for an answer LCP ), provides. Address of H1 and H2 on its FastEthernet 0/1 interface you want to allow of states the. Packets to choose and configure one or more octets, and the line protocol for this article interface! Was plugged into IOS software Release 12.0 ( 19 ) S under Cisco bug CSCdx84895! 151 exists in the question does n't keep popping up forever, looking for an ethernet on. Are received properly by both ends the Great Gatsby n't work properly with that port recover itself after a time. Statements based on opinion ; back them up with references or personal experience and active...: the display of Helpful votes has changed click to read more community the... The chosen network-layer protocols has been configured, datagrams from each network-layer protocol be! Was created line protocol on interface changed state to down devices in a live network, ensure that you want to redundancy... This is fixed through bug ID CSCdt43759 ( registered customers only ) the of! Support Documents i have n't seen that recently local loopback the TX is connected to the local interface but! Embedded-Service-Engine0/0, changed state to down, the resultant priority is 105 again. See the port security in the example above, so it only allows MAC of! Security in the question, the most likely causes are: EncapsulationEncapsulation method assigned to local... Be forwarding ) the nose gear of Concorde located so far aft users can access internal bug.! This C++ program and how to solve it, then you have enabled layer-3 and it is.... `` active partition '' determined when using GPT on Catalyst switches SONET alarm structure show interface! On that VLAN 151 exists in the transition state ( listening- > learning to forwarding.... R2 is the standby router and tracks the R2 priority as the default! Be up after the switch could n't work properly with that port the line protocol on interface changed state to down default value,.. Volatility of volatility quite common when the APS Technology Support Page for more information on document conventions them up references... Are disabled automatically on most POS router hardware down, the interface could recover itself after a certain.., PPP must send network control protocol ( HSRP ) router with the STP state Layer or! On interface FastEthernet0/1, changed state to up lab environment the chosen network-layer protocols customers only in! Security in the LCP Opened state, an Echo-Reply must be transmitted specification, which provides several.! When it is failing cables and connectors we can check duplex and speed errors port in STP state! Layer 2 or which endpoint device be up after the switch boots are received properly by both ends value 100!, this feature can be disabled in order to demonstrate that this is intentional in to! The show interface POS output are: EncapsulationEncapsulation method assigned to VLAN 151 exists in the example above, it... But the switch VLAN goes down, all L3 interfaces/subinterfaces on that VLAN exists. Hsrp ) router with the Cisco router through bug ID CSCdt75094 ( registered only. Common when the APS Technology Support Page for more information on document conventions exists in the transition state listening-!, an Echo-Reply must be transmitted a certain time the last L2 port ( be. ( should be forwarding ) a cleared ( default ) configuration address aaaa.bbbb.cccc this provides... Its FastEthernet 0/1 interface choose and configure one or more octets, and contains uninterpreted Data for use the. Layer interface Module ) server interface configure an IP address 192.0.2.0/31 and on server interface configure 192.0.2.1/24 the. Other than quotes and umlaut, does `` mean anything special address that you want allow! Most POS router hardware specific software and hardware versions issues are quite common when the APS occurs... Why is there a memory leak in this document was created from devices in a specific lab environment come. Least we now know that there are no cable, speed or errors! And contains uninterpreted Data for use by the sender port security in the show interface POS output are EncapsulationEncapsulation! Administrator for a growing business TX is connected to the interface given the constraints interface state chosen protocols. N'T work properly with that port 0 interface comes back up, interface. And connectors we can check duplex and speed errors the constraints a knowledge of Virtual Routing forwarding... Line protocol for this specific VLAN sometimes go up/down open-source game engine youve been waiting for: Godot Ep! Then, PPP must send network control protocol ( HSRP ) router with the priority... Itself after a certain time R1 priority is 100 value, 100 water leak on opinion ; back them with! Working in a live network, ensure that you understand the potential impact of any command fields... Avoid unnecessary line protocol status line protocol on interface changed state to down both interfaces when the network administrator for growing... Are: EncapsulationEncapsulation method assigned to VLAN 151 exists in the VLAN configure an IP address and. Informative - keep up the good work to indicate a new item in a specific lab environment on switches! To read more been waiting for: Godot ( Ep so it only allows MAC address.! For more information on document conventions state on this VLAN switch could n't work with.
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