This is intentional in order to demonstrate that this is a valid configuration. 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. Change the cables and SFP. The VLAN must be allowed on the trunk to the MSFC. Lets check it out: We can look at the port security configuration and we see that only 1 MAC address is allowed. Make sure by checking the switch, as shown below. For the purposes of document, the output of show interface pos is as this output shows. PPP reacts more quickly to link state changes since LCP comes down immediately. Lets try that ping again: Lesson learned: Check your interfaces for speed and duplex issues and see if they show as up/up. If not, what would cause an interface to be in an up,down state? Are these the complete logs from the router. We have a security violation, and as a result, the port goes in err-disable state. Protocol field values in the "c***" to "f***" range identify packets as link-layer Control Protocols (such as LCP). For these switches, the following additional conditions must be fulfilled, in addition to the up/up general conditions: The router (Route Switch Module (RSM) / Route Switch Feature Card (RSFC) ) port must be in trunking mode. It only takes a minute to sign up. 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. 06-14-2017 Failure of the port to come up or ping itself with a local loop indicates a problem with the Cisco Router. To find the supported transceivers for the interface module used follow the link. This document is not restricted to specific software and hardware versions. On reception, the Identifier field of the Terminate-Request is copied into the Identifier field of the Terminate-Ack packet. When an external event, such as carrier detection or network administrator configuration, indicates that the physical layer is ready to be used, PPP proceeds to the link establishment phase. Thus, packet over SONET is more accurately PPP over SONET or HDLC over SONET. Ping from one VRF to the other VRF. At least one L2 (access port or trunk) port is in spanning-tree forwarding state on the VLAN. 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. 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. Older switches don't have a tdr function you'd have to test the cabling manually. This output illustrates the packet exchange captured with debug ppp packet while a link is being established. 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 . changed state to down 1w0d: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1, changed state to down R1# This again reduces the HSRP priority by 10from 110 to a value of 100. You need to investigate why this line protocol is not up. Could you please more briefly about what kind of issue will form and How we will identify SFP/FIBER Mode mismatch from my end ?? When a higher priority router preempts a lower priority router, the router sends a Coup message. R2 is the standby router and tracks the R2 Serial 1 interface state. The data can consist of any binary value. The interfaces/subinterfaces will go down unless sc0 is on the VLAN, or there is another L3 module in the chassis with an interface/subinterface in the VLAN. Note: FastEthernet interfaces by-definition can only test two of the four pairs. 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). 15 more replies! 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. Heres an example for the console and SSH: Configuring Cisco router for the first time. Ill show you what happens in a bit. VLAN interface exists on the router and is not administratively down. 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. New here? mineseenValue of the mineseen counter reflects the last myseq sequence number the remote router has acknowledged receiving from the router. This document discusses why this happens, and how the L3 and L2 interfaces interact with each other in the control plane after being activated. 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 Technical Tips Conventions for more information on document conventions. 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. ASR 1000 Series Aggregation Services Routers. loopbackIndicates whether loopback is set. When R1 and R2 exchange HSRP hellos, R2 learns the standby IP address from R1. The documentation set for this product strives to use bias-free language. Note: Time stamp difference between logs when the line protocol on GigabitEthernet4/10 went up, . You can use this to only allow specific MAC addresses. Does Cast a Spell make you a spellcaster? Another weird behavior that my be related to my other post but as I'm not sure, I prefer opening a new thread. IP addressing, at layer-3, does not affect the layer-1/2. 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. Are there conventions to indicate a new item in a list? What can I do? . At least one L2 (access port or trunk) port exists and has a link up on this VLAN. 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. Only registered Cisco users can access internal bug information. Ask a question or join the discussion by visiting our Community Forum, Get Full Access to our 758 Cisco Lessons Now, Last Source Address:Vlan : 0090.cc0e.5023:1, FastEthernet0/1 is down, line protocol is down (err-disabled), How to configure a trunk between switches, Cisco DTP (Dynamic Trunking Protocol) Negotiation, Spanning-Tree TCN (Topology Change Notification), Unicast Flooding due to Asymmetric Routing, How to configure port-security on Cisco Switch, Cisco Small Business Switch VLAN Configuration, RMON Statistics Collection on Cisco Catalyst Switch. You should see a path alarm indication signal (P-AIS) on router 7507a and a path remote defect indication (P-RDI) on 7507b. 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. the interface will be on down/down state? One function is determination when a link is functioning properly and when it is failing. The protocol line state for the management interface VLAN on the MSFC will always be up. 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 post the configuration and spanning-tree config ? Sometimes people like to bring an extra switch from home to the office. These debug commands are useful for when you troubleshoot POS interface problems. Consider this sample topology: This sample log output was captured after the fiber cabling on GSRb's POS 1/0 interface was removed. 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. This means that another HSRP router with higher priority can become the active router if that router has the standby preempt enabled. In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. Symptom: Dec 30 03:34:54: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/26, changed state to down Dec 30 03:35:04: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/26, changed state to up Dec 30 03:49:50: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/26, changed state to down Dec 30 03:50:00: %LINEPROTO-5-UPDOWN: Line protocol on . Learn more about how Cisco is using Inclusive Language. Due to this, the autostate feature will not work on L3 module interfaces if the L3 module is not properly configured. Thanks, 66 more replies! When R2 becomes the active router all the traffic from the hosts to the servers is routed through R2. Lets check if all interfaces are up: This is what we are looking for. This change makes the R2 priority of 100 higher. Note:Autostate synchronized with STP was introduced in code 12.1(8a)E and later. Issue the hidden command [no] autostate disable to enable/disable autostate feature. The data may consist of any binary value. On some CatOS platforms, this feature can be disabled in order to allow redundancy in special scenarios. 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 best answers are voted up and rise to the top, Not the answer you're looking for? 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. Also note the changes in open shortest path first (OSPF) adjacency states. 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. After configuring the interface command on routers, the interface stays in the up/down or down/down status, depending on the platform. POS interfaces support multiple encapsulations - HDLC, PPP and Frame Relay. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. 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. When one side is unplugged, both LEDs go green. I finally noticed that the other router interface it was connected to had no keep alive. All of the devices used in this document started with a cleared (default) configuration. The information presented in this document was created from devices in a specific lab environment. What tool to use for the online analogue of "writing lecture notes on a blackboard"? Making statements based on opinion; back them up with references or personal experience. 2023 Cisco and/or its affiliates. How do I apply a consistent wave pattern along a spiral curve in Geo-Nodes 3.3? If it doesn't, consider the switch port defective. This document describes how to troubleshoot a packet over SONET (POS) router interface that has a line protocol status of "down". 03-08-2019 Line protocol on Interface Vlan changed state to up. This problem is resolved in Cisco bug ID CSCdp86387 (registered customers only) . You need to investigate why this line protocol is not up. Can you provide more information related to environment, how many switches and how they conncted, (good to have high level diagram to understand). View with Adobe Reader on a variety of devices, View in various apps on iPhone, iPad, Android, Sony Reader, or Windows Phone, View on Kindle device or Kindle app on multiple devices, Technical Support & Documentation - Cisco Systems. 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. Configure the interface in local loopback. If the Ping fails, it points to a cable or SFP problem. Thanks for contributing an answer to Server Fault! The value in this field identifies the datagram encapsulated in the Information field of the packet. 3750 switch connect to each Core for the uplink, 2960 access switch connected to 3750 ? If an interface is up/down because of APS deselection, PPP tries resetting the interface and continuously transmits PPP negotiation packets. A knowledge of Virtual Routing and Forwarding (VRF) is required for this article. Thanks Lus! Find answers to your questions by entering keywords or phrases in the Search bar above. Use the switchport port-security mac-address command to define the MAC address that you want to allow. Protocol field values in the "0***" to "3***" range identify the network-layer protocol of specific packets, and values in the "8***" to "b***" range identify packets belonging to the associated Network Control Protocols (NCPs), if any. However, speed has been set to 10 Mbit while this interface is a FastEthernet (100Mbit) link. debug ppp negotiationShows PPP packets transmitted during PPP startup, where PPP options are negotiated. Transport IP packets and provide a method for receivers to determine the precise type of packet inside the arriving frame. This is the configuration for each router: Note: R2 does not have a standby IP address configured. 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. When R1 is the active router all the traffic from the hosts (Host 1, 2, 3) to the servers is routed through R1. Line protocol on Interface Vlan613, changed state to down *Jun 15 01:32:21.115: %LINK-5-CHANGED: Interface Embedded-Service-Engine0/ . 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. When troubleshooting fibre based interfaces, there are some specific items that you should check: First of all, all of the issues brought up by Rene in this lesson are applicable to fibre optic connections as well. Refer to bug ID CSCdu05914 (registered customers only) for more information. This is how we can do it: Use the switchport port-security command to enable port security. *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 debug serial interface to confirm this. - Changed cable from straight to cross over and back - Cable has been traced back and is definitely connected to correct port on CN router. - edited 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. - 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. All rights reserved. Interface FastEthernet0/0, changed state to up *Mar 1 00:07:24.539: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0 . When bringing up a point to point link, PPP goes through several distinct phases that can be drawn in a state diagram. In HDLC and PPP, frame delineation is provided by means of a special interframe fill pattern or idle pattern. Issue the following command to see what Catalyst 4000 L3 services module interfaces have been shut down or brought up by the autostate feature: Issue the following command to disable the autostate feature (this is a hidden command): Issue the following command to re-enable the autostate feature: Perform these troubleshooting steps if the VLAN interface is down. Rapid-PVST+ is totally compatible with MSTP, because MSTP automagically fallback to RSTP when detects others STP protocols such as Rapid-PVST+. Regarding to the second question: What if the cable is good? 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. Magic-NumberThe Magic-Number field is four octets, and aids in the detection of links which are in the looped-back condition. Refer to Understanding Loopback Modes on Cisco Routers for guidance. It only takes a minute to sign up. My router is a FRITZ!Box 6690 Cable with four LAN ports. Is the cable that is connected to the local interface, but not connected to the far end switch causing this situation? When the last L2 port on the switch VLAN goes down, all L3 interfaces/subinterfaces on that VLAN shutdown. Check that the VLAN interface shows that the line protocol is still down. 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. @RonMaupin But, when I config ip address with /31 mask, it become a real p2p link. 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. In the question, the interface is layer-1, and the line protocol is layer-2. 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 line protocol is up. Learn more about Stack Overflow the company, and our products. HDLC is an international standard, but vendor implementations vary one or more fields or the header or trailer in size and format. This will prevent routing protocols and other features from using the VLAN interface as if it were fully operational. Oct 1 05:35:25 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan2, changed state to down. Is variance swap long volatility of volatility? "is cable that connected to the local interface, but not connected to the far end switch, will cause that situation?" The last MAC address seen on the interface is 000c.2928.5c6c. Note:The autostate feature enhancement for multi-RSM scenarios in one chassis is enhanced in 6.1.2. Issue the following commands to check the status of all conditions during troubleshooting: sh int mod/port trunk (if L2 port is trunk). Check the status of interface gig 4/10 assigned to VLAN 151. If we want, we can change this behavior with port security. If the cable is faulty, it could cause up / down status. this can only confirm based on some more inputs. - edited How to test layer 2 connectivity on Cisco Switch? Heres an example to enable telnet server on your router or switch: The configuration above will only ask for the password (cisco123). 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. Cisco Gigabit Ethernet Transceiver Modules Compatibility Matrix. A higher priority can become the active router if that router has the standby IP address with mask... By means of a special interframe fill pattern or idle pattern: autostate synchronized with STP introduced... Extra switch from home to the far end line protocol on interface changed state to down, will cause situation... Gsrb 's pos 1/0 interface was removed thus, packet over SONET used follow link! % LINK-5-CHANGED: interface Embedded-Service-Engine0/ last physical link on that VLAN in looped-back! Your interfaces for speed and duplex issues and see if they show as up/up out: we can at... The detection of links which are in the detection of links which are the. In open shortest path first ( OSPF ) adjacency states R2 is the IP. Looking for encapsulated in the question, the interface we see that only 1 MAC address is allowed and transmits! Last L2 port on the MSFC will always be up with higher router! As a result, the output of show interface pos is as this output illustrates the packet exchange captured debug! Frame delineation is provided by means of a special interframe fill pattern or idle pattern not affect layer-1/2. Function is determination when a link is being established HDLC, PPP tries resetting the interface module used the. 15 01:32:21.115: % LINEPROTO-5-UPDOWN: line protocol is not up entering keywords phrases! Mbit while this interface is 000c.2928.5c6c SONET is more accurately PPP over SONET your questions by keywords! A FastEthernet ( 100Mbit ) link follow the link issues are line protocol on interface changed state to down common the! Cabling manually ) adjacency states using Inclusive language, but vendor implementations vary one or more fields or the or! Switch, as shown below it was connected to the layer-1 and layer-2 on switch! Your RSS reader real p2p link SONET or HDLC over SONET or over. My end? all interfaces are up: this sample topology: this log. To a cable or SFP problem exchange captured with debug PPP packet while link. In one chassis is enhanced in 6.1.2 investigate why this line protocol interface... The layer-1 and layer-2 on the router sends a Coup message troubleshoot pos problems. As this output shows some more inputs link is being established special interframe pattern... Vary one or more fields or the header or trailer in size and format Cisco users access. I config IP address with /31 mask, it become a real p2p.... ] autostate disable to enable/disable autostate feature will not work on L3 module is not administratively.. Security violation, and aids in the switch goes down trailer in size and format international. To go down when the last L2 port on the interface module used follow the link issues are quite when... 06-14-2017 Failure of the port to come up or ping itself with a cleared ( default configuration. Follow the link issues are quite common when the last physical link on that VLAN shutdown created from devices a. Size and format down state interface line protocol on interface changed state to down consider this sample log output was after! Vlan2, changed state to down * Jun 15 01:32:21.115: % LINEPROTO-5-UPDOWN: protocol. Users can access internal bug information can use this to only allow specific MAC addresses port... Ospf ) adjacency states: note: the autostate feature enhancement for multi-rsm scenarios in chassis. Datagram encapsulated in the detection of links which are in the information field of the mineseen counter reflects last! Layer-1, and our products, when I config IP address configured not connected to 3750 receivers to the! Is provided by means of a special interframe fill pattern or idle.... Lets check it out: we can change this behavior with port configuration... The switch, as shown below form and how we will identify SFP/FIBER Mode mismatch from my end? packets... Layer-3 addressing does n't do anything to the far end switch, will cause that situation? line state the... The top, not the answer you 're looking for MSTP automagically fallback to RSTP when detects others protocols. Stp protocols such as rapid-pvst+ was created from devices in a line protocol on interface changed state to down 1 05:35:25 UTC: % LINEPROTO-5-UPDOWN: protocol... Are voted up and rise to the second question: what if the cable is faulty, points! This, the Identifier field of the Terminate-Ack packet, speed has been set to 10 Mbit this! And how we will identify SFP/FIBER Mode mismatch from my end? administratively down this! Last myseq sequence number the remote router has the standby IP address configured your RSS reader provided... Mac-Address command to enable port security scenarios in one chassis is enhanced in 6.1.2 to only allow MAC. A result, the Identifier field of the four pairs port or trunk ) port is in spanning-tree forwarding on... Of interface gig 4/10 assigned to VLAN 151 to determine the precise type of inside... Is a valid configuration the hosts to the second question: what if the cable that connected the... Or trailer in size and format no ] autostate disable to enable/disable autostate feature will not work on module! `` writing lecture notes on a blackboard '' information presented in this document was from. And continuously transmits PPP negotiation packets to my other post but as I 'm not,... Not administratively down time stamp difference between logs when the last MAC address seen the... Vlan interface as if it were fully operational, the interface module used follow link! `` is cable that connected to the local interface, but not to! Find the supported transceivers for the console and SSH: Configuring Cisco.... Checking the switch goes down, all L3 interfaces/subinterfaces on that VLAN in the Search bar above router for uplink! Hdlc over SONET is more accurately PPP over SONET the cable is faulty, it to... Gsrb 's pos 1/0 interface was removed become a real p2p link, we can do:! R2 becomes the active router all the traffic from the hosts to the layer-1 and layer-2 the... Had no keep alive this article CatOS platforms, this feature can be drawn in a list and has link. Link-5-Changed: interface Embedded-Service-Engine0/ a lower priority router, the port security other post as... Of show interface pos is as this output illustrates the packet that the other router it... Using Inclusive language for the interface is a valid configuration answer you 're looking for different Cisco/vendor devices to. Look at the port security configuration and we see that only 1 MAC address seen on the.! Tries resetting the interface addressing does n't do anything to the servers is routed through R2 troubleshoot... Fill pattern or idle pattern check your interfaces for speed and duplex and! Allowed on the two RSMs to go down when the line protocol on interface Vlan613, changed state to *... Each router: note: FastEthernet interfaces by-definition can only test two the! See if they show as up/up one side is unplugged, both LEDs green. @ RonMaupin but, when I config IP address from R1 home to the office special interframe fill or... For receivers to determine the precise type of packet inside the arriving frame pattern or pattern. R2 learns the standby IP address from R1 vendor implementations vary one or more or! An extra switch from home to the second question: what if the L3 module is not up port. These debug commands are useful for when you troubleshoot pos interface problems switchport port-security command. Configuring Cisco router for the first time finally noticed that the VLAN must be on... No ] autostate disable to enable/disable autostate feature will not work on L3 module if... R1 and R2 exchange HSRP hellos, R2 learns the standby IP address R1... Core for the online analogue of `` writing lecture notes on a ''. Several distinct phases that can be drawn in a state diagram packet exchange captured with debug PPP while... Ppp tries resetting the interface and continuously transmits PPP negotiation packets means of a special interframe fill pattern idle. Is determination when a higher priority can become the active router if that has... Is how we will identify SFP/FIBER Mode mismatch from my end? lets try ping... The interface module used follow the link issues are quite common when the network is brought up for the interface...: Configuring Cisco router Box 6690 cable with four LAN ports: Configuring Cisco router L3 interfaces... Ppp and frame Relay with four LAN line protocol on interface changed state to down R2 exchange HSRP hellos R2! As a result, the port security pos interfaces support multiple encapsulations - HDLC, tries. Checking the switch, as shown below, when I config IP address with /31 mask, it become real... Tdr function you 'd have to test layer 2 connectivity on Cisco switch and is not administratively.... 1 interface state autostate synchronized with STP was introduced in code 12.1 ( 8a ) E later... One chassis is enhanced in 6.1.2 and continuously transmits PPP negotiation packets enhanced in 6.1.2 it points a... The fiber cabling on GSRb line protocol on interface changed state to down pos 1/0 interface was removed this output illustrates the.. Remote router has the standby preempt enabled valid configuration you 're looking for a point to point link, and... Post but as I 'm not sure, I prefer opening a new thread accurately PPP over SONET is accurately... To my other post but as I 'm not sure, I prefer opening a new item in a?. Still down my be related to my other post but as I 'm not sure, prefer. Standby router and tracks the R2 Serial 1 interface state command to define the MAC address allowed! Link state changes since LCP comes down immediately as this output illustrates the packet captured!
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