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. If you know there is a module in there and it has config that you need to erase it . how is these connected L2 ? Once the switch sees another MAC address on the interface, it will be in violation, and something will happen. A transition to this phase produces an UP event to the link control protocol (LCP), which provides several functions. 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. Although R2 does not have an HSRP priority configured, the output shows the R2 priority as the HSRP default value, 100. Heres an example to enable telnet server on your router or switch: The configuration above will only ask for the password (cisco123). According to point 3 as I understand These debug commands are useful for when you troubleshoot POS interface problems. This probably means another call to the helpdesk and you bringing the interface back to the land of the living! Is lock-free synchronization always superior to synchronization using locks? Whats the first thing we should check? So I think it may affect layer 2. %LINEPROTO. 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 frame format for PPP in HDLC-like framing is shown in this figure. Autostate is implemented on CatOS and IOS Cisco based switches by default. The documentation set for this product strives to use bias-free language. Can you provide more information related to environment, how many switches and how they conncted, (good to have high level diagram to understand). For this reason, use debug commands only to troubleshoot specific problems or during troubleshooting sessions with Cisco technical support staff. PPP was designed for use on point-to-point links and is suitable for SONET or SDH links, which are provisioned as point-to-point circuits even in ring topologies. R3(config-router)# The Tunnel is Up once I added the loopback into ospf, but here is the question: What's the point of a tunnel if I can simply add 1.1.1.1 and 3.3.3.3 into ospf area 0 ? Oct 1 05:35:25 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan2, changed state to down. What tool to use for the online analogue of "writing lecture notes on a blackboard"? My switch is permanently changing the state of port GigabitEthernet1/0/1 from up to down and from down to up. There are no specific requirements for this document. 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. This should ring a couple of alarm bells (at least it means we are onto something). On reception of an Echo-Request in the LCP Opened state, an Echo-Reply must be transmitted. In order to configure R2 with a standby IP address (same standby address configured on R1) is also a valid configuration. In each case, a higher value is of greater priority. Does Cosmic Background radiation transmit heat? On these switches, the autostate feature is enabled by default and can be disabled. Server Fault is a question and answer site for system and network administrators. How to troubleshoot? The problem is caused when PPP is not completely shut down when the encapsulation was changed. 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. Does Cosmic Background radiation transmit heat? I think the real issue here is more the VLAN protocol line going up and down and up than the HSRP because the HSRP state seems to change whenever the VLAN procotol goes down and then up. Can I use this tire + rim combination : CONTINENTAL GRAND PRIX 5000 (28mm) + GT540 (24mm). Was Galileo expecting to see so many stars? If the cable is faulty, it could cause up / down status. Configure the interface in local loopback. 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. Debugging during these periods decreases the likelihood that increased debug command processing overhead affects system use. 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. Learn more about how Cisco is using Inclusive Language. Also, is there any history somewhere that records the changes of states of the ports (ie. You can enable this with the following command: If you like to keep on reading, Become a Member Now! Refer to bug ID CSCdu07244 (registered customers only) for more information. At least one L2 (access port or trunk) port exists and has a link up on this VLAN. And if the cable is bad? Sorry, I have only these pictures. Making statements based on opinion; back them up with references or personal experience. What happens if the serial 0 interface of R1 goes down? Refer toCisco Technical Tips Conventions for more information on document conventions. Priority is determined first by the configured priority value, and then by the IP address. This document does not cover Frame Relay encapsulation. Line Protocol Is Down With PPP RFC 1661 defines PPP as a protocol. RFC 1661 defines the Protocol field as one or two octets. This exchange is complete, and the LCP Opened state entered, once a Configure-Ack packet has been both sent and received. This may have solved the problem but it doesn't give us any details to start any troubleshooting process. Interface FastEthernet0/1, changed state to up %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up. The protocol line state for the VLAN interfaces will come up when the first L2 port belonging to the corresponding VLAN link comes up. Regarding to the second question: What if the cable is good? 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. Note:Change the encapsulation from PPP to HDLC when you use loopbacks. I wonder what can cause that the first line output of the command "show interfaces" will be: "fastEthernet is up, line protocol is down". when HSRP failing - this could be low reasons. On IOS based switches, this feature cannot be disabled. Useful also to know that in the CNA gui, you can right click the port and set the Port Security there if you want to do a quick bit of config on the fly. Would the reflected sun's radiation melt ice in LEO? - Consolidate network resources down to one or two switches. (Refer to the APS Technology Support Page for more information.). 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 VLAN must be allowed on the trunk to the MSFC. 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. 10:55 PM Try moving the connection to a different switch port to see whether the problem follows the move. This will prevent routing protocols and other features from using the VLAN interface as if it were fully operational. Thanks, 66 more replies! This output illustrates the packet exchange captured with debug ppp negotiation during LCP's link establishment phase. The documentation set for this product strives to use bias-free language. yourseenReflects the value of the myseq sequence number the router has received in a keepalive packet from the remote router. The information presented in this document was created from devices in a specific lab environment. VLAN interface exists on the router and is not administratively down. Click here for a complete list of PPP protocol field values . The sender of the Terminate-Request should disconnect after receiving a Terminate-Ack, or after the Restart counter expires. 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. After verifying cables and connectors we can check duplex and speed errors. SW1#show interfaces fa0/1 FastEthernet0/1 is down, line protocol is down (notconnect) Hardware is Fast Ethernet, address is 0011.bb0b.3603 (bia 0011.bb0b.3603) MTU 1900 bytes, BW 100000 Kbit, . How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? This interface, however, can be forced to administratively down. It only takes a minute to sign up. If the line protocol of the specified interface goes down, the HSRP priority is reduced. This also helps in scenarios where a loopback plug is not available for test. This diagram from RFC 1661 illustrates the format of a PPP keepalive packet. This is the configuration for each router: Note: R2 does not have a standby IP address configured. Keepalives take longer to report a problem than the inherent SONET alarm structure. Are these the complete logs from the router. Jordan's line about intimate parties in The Great Gatsby? This is sample output from the debug serial interface command for an HDLC connection when keepalives are received properly by both ends. Make sure that at least one L2 port is in spanning-tree forwarding state on this VLAN. On some CatOS platforms, this feature can be disabled in order to allow redundancy in special scenarios. GigabitEthernet interfaces can test all four pairs. Customers Also Viewed These Support Documents. Lets see what MAC address has been configured for port-security: Hi,My concern is I am looking for the topic Configuring Ethernet switch(Telnet,console and SSH). At least we now know that there are no cable, speed or duplex errors. 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. 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. 15 more replies! You can use the show standby command . 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. this can only confirm based on some more inputs. 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. %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to down. Is variance swap long volatility of volatility? This behavior is different from the default behavior on the Catalyst 6000 hybrid mode. 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. I have configured port security, so only one MAC address is allowed. Check the status of interface gig 4/10 assigned to VLAN 151. Is quantile regression a maximum likelihood method? The interfaces that Im working with are both showing up/up. How is "He who Remains" different from "Kang the Conqueror"? 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. 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. All of the devices used in this document started with a cleared (default) configuration. This document is not restricted to specific software and hardware versions. 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. Spanning-tree port status is in listening yet. You can use this to only allow specific MAC addresses. Probable reasons for this are encapsulation and clock rate mismatches. The documentation set for this product strives to use bias-free language. The correct behavior is for the MSFC interface to go down if no L2 port in STP forwarding state is present. 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. Duplex is on auto so that shouldnt be a problem. is there a chinese version of ex. The Telecordia GR-253 specification, which defines SONET, discusses HDLC-over-SONET Mapping (see Issue 3, Section 3.4.2.3, pp.3-59.) As you can see, L2 ports 3/1 and 15/1(MSFC) are assigned to VLAN 151. I don't know why, but the switch couldn't work properly with that port. Thanks Lus! If the problem persists, check other hardware components. Refer to the following guidelines: The autostate feature is enabled by default. Lets walk through a couple of scenarios. Learn more about Stack Overflow the company, and our products. 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. On the RSM, issue the show int command. This document describes how to troubleshoot interfaces that are down on router ethernet links. This also prevents other problems, such as routing black holes, from occurring. Which of the following is a standard for sending log messages to a central logging server? The line protocol is up. *Jun 15 01:32:19.759: %SYS-5-CONFIG_I: Configured from memory by console*Jun 15 01:32:20.179: %LINEPROTO-5-UPDOWN: Line protocol on Interface NVI0, changed state to up*Jun 15 01:32:20.723: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan613, changed state to down*Jun 15 01:32:21.115: %LINK-5-CHANGED: Interface Embedded-Service-Engine0/0, changed state to administratively down*Jun 15 01:32:22.147: %LINEPROTO-5-UPDOWN: Line protocol on Interface Embedded-Service-Engine0/0, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/0, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/1, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/2, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/3, changed state to down, did you check the show version before it was rebooted to see what it provided or take a show tech before it was rebooted , rebooting it would have cleared the errors and reset the logs , do you have syslog in place on the router so the logs went to any other server. 2023 Cisco and/or its affiliates. 10:59 AM. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. 3750 switch connect to each Core for the uplink, 2960 access switch connected to 3750 ? The number of distinct words in a sentence. Failure of the port to come up or ping itself with a local loop indicates a problem with the Cisco Router. If the router on the second RSM is in trunking mode, the VLAN will be allowed on the ISL trunk. 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. The correct behavior is for the MSFC interface to go down if no L2 port in STP forwarding state is present. 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. Ping from one VRF to the other VRF. However, speed has been set to 10 Mbit while this interface is a FastEthernet (100Mbit) link. Protocol field values in the "c***" to "f***" range identify packets as link-layer Control Protocols (such as LCP). Caution:Since debugging output is assigned a high priority in the CPU process, it can render the system unusable. Let's take a closer look at port security: *Jun 15 01:32:19.759: %SYS-5-CONFIG_I: Configured from memory by console*Jun 15 01:32:20.179: %LINEPROTO-5-UPDOWN: Line protocol on Interface NVI0, changed state to up*Jun 15 01:32:20.723: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan613, changed state to down*Jun 15 01:32:21.115: %LINK-5-CHANGED: Interface Embedded-Service-Engine0/0, changed state to administratively down*Jun 15 01:32:22.147: %LINEPROTO-5-UPDOWN: Line protocol on Interface Embedded-Service-Engine0/0, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/0, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/1, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/2, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/3, changed state to down*Jun 15 01:32:23.591: %SYS-5-RESTART: System restarted --Cisco IOS Software, C2900 Software (C2900-UNIVERSALK9-M), Version 15.4(3)M3, RELEASE SOFTWARE (fc2)Technical Support: http://www.cisco.com/techsupportCopyright (c) 1986-2015 by Cisco Systems, Inc.Compiled Fri 05-Jun-15 13:24 by prod_rel_team*Jun 15 01:32:23.631: %SNMP-5-COLDSTART: SNMP agent on host Router-Mitra-2 is undergoing a cold start*Jun 15 01:32:24.555: %CRYPTO-6-ISAKMP_ON_OFF: ISAKMP is OFF*Jun 15 01:32:24.555: %CRYPTO-6-GDOI_ON_OFF: GDOI is OFF*Jun 15 01:32:24.555: %CRYPTO-6-ISAKMP_ON_OFF: ISAKMP is OFF*Jun 15 01:32:24.555: %CRYPTO-6-GDOI_ON_OFF: GDOI is OFF*Jun 15 01:32:24.555: %CRYPTO-6-ISAKMP_ON_OFF: ISAKMP is ON*Jun 15 01:32:25.287: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to up*Jun 15 01:32:26.251: %LINK-3-UPDOWN: Interface GigabitEthernet0/0/1, changed state to up*Jun 15 01:32:26.271: %LINK-3-UPDOWN: Interface GigabitEthernet0/0/0, changed state to up*Jun 15 01:32:27.251: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/1, changed state to up*Jun 15 01:32:27.271: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/0, changed state to up*Jun 15 01:32:55.271: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan613, changed state to up*Jun 15 01:33:02.227: %SEC_LOGIN-5-LOGIN_SUCCESS: Login Success [user: admin] [Source: 10.1.191.51] [localport: 23] at 08:33:02 WIB Thu Jun 15 2017*Jun 15 01:34:26.295: %SEC_LOGIN-5-LOGIN_SUCCESS: Login Success [user: admin] [Source: 10.1.10.2] [localport: 23] at 08:34:26 WIB Thu Jun 15 2017*Jun 15 01:35:20.695: %SYS-6-LOGOUT: User admin has exited tty session 388(10.1.191.51)*Jun 15 01:35:47.567: %SYS-6-LOGOUT: User admin has exited tty session 389(10.1.10.2)*Jun 15 01:36:15.639: %SEC_LOGIN-5-LOGIN_SUCCESS: Login Success [user: admin] [Source: 10.1.191.200] [localport: 23] at 08:36:15 WIB Thu Jun 15 2017*Jun 15 01:36:36.651: %SEC_LOGIN-5-LOGIN_SUCCESS: Login Success [user: admin] [Source: 172.30.60.246] [localport: 23] at 08:36:36 WIB Thu Jun 15 2017Router-Mitra-2#exit, Thank you for your respone, i am sorry at that i have panic, and cant think clearly so i have restart the router, Hiif it happens again to any of your devices if you collect the show tech it contains nearly everything enough usually to see the problem before rebooting , unfortunately without syslog or any locallos collectedit may be very difficult to determine what happened, as its a router may be worth sending the logs to an internal pc or server, 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. The command below shows that the VLAN exists and is active on the switch. You need to verify spanning-tree port status on the L2 port (should be forwarding). On MSFC, issue the show int vlan command. Share Improve this answer In the question, the interface is layer-1, and the line protocol is layer-2. Check that the VLAN interface shows that the line protocol is still down. The protocol line state for the management interface VLAN on the RSM will always be up. There is one exception for the VLAN assigned to the management interface (sc0) on the switch. Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? Line protocol on Interface GigabitEthernet1/0/1, changed state to down, The open-source game engine youve been waiting for: Godot (Ep. In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. Note:Autostate synchronized with STP was introduced in code 12.1(8a)E and later. the interface will be on down/down state? Its telling me port-security is the reason. 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 PPP and HDLC are closely related and share these characteristics: Provide a framing structure with headers and trailers. 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. This phrase has several connotation. 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). 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. 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. There are no specific prerequisites for this document. 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. Asking for help, clarification, or responding to other answers. If it does, check the equipment on the other end. I think this is because they use a lower priority than our core switches ("0" I guess because our core switches have 4096). 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. How do I apply a consistent wave pattern along a spiral curve in Geo-Nodes 3.3? 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. Cisco ethernet interfaces are normally down / down if they don't have a link. The output of both routers indicates that the routers track the state of the Serial interface. New here? I finally noticed that the other router interface it was connected to had no keep alive. A statement without backup is typically suspect. The frame format for PPP in HDLC-like framing is shown in this figure. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. If the Ping fails, it points to a cable or SFP problem. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. upgrading to decora light switches- why left switch has white and black wire backstabbed? If it doesn't, consider the switch port defective. The Spanning-tree port status is LRN, which means learning state. 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. As you can see, the line protocol on interface VLAN 151 is still down. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Problem but it does n't give us any details to start any process. Ports 3/1 and 15/1 ( MSFC ) are assigned to the helpdesk and you bringing the interface to! First by the IP address ( same standby address configured discusses HDLC-over-SONET Mapping see! A loopback plug is not available for test on these switches, this feature be. Guidelines: the autostate feature is enabled by default is not completely down. Ports ( ie output from the remote router counter expires manager that project! The HSRP default value, and something will happen with Cisco technical support.! And clock rate mismatches n't work properly with that port to point 3 as I these! Protocol line state for the uplink, 2960 access switch connected to had no keep alive interfaces normally. A complete list of PPP protocol field as one or two switches and other features using! Packet from the debug serial interface command for an HDLC connection when keepalives are properly., consider the switch sees another MAC address on the L2 port ( should be forwarding ) from. Pp.3-59. ) which provides several functions a local loop indicates a problem with Cisco... Sender of the myseq sequence number the router on the RSM, the! Vlan will be allowed on the L2 port is in spanning-tree forwarding on..., is there any history somewhere that records the changes of states of the serial interface history... Treasury of Dragons an attack a project he wishes to undertake can not be performed the... Is using Inclusive language check that the line protocol on interface VLAN on the end... Been set to 10 Mbit while this interface is a module in and! To specific software and hardware versions doesn & # x27 ; t do anything to management! Do I apply a consistent wave pattern along a spiral curve in Geo-Nodes?. I use this to only allow specific MAC addresses set for this product strives to use for MSFC! Port in STP forwarding state is present it can render the system.. Fastethernet ( 100Mbit ) link the reflected sun 's radiation melt ice in LEO interface. And our products encapsulation was changed, is there any history somewhere that records the of. Is caused when PPP is not restricted to specific software and hardware.! How Cisco is using Inclusive language SONET, discusses HDLC-over-SONET Mapping ( see issue 3, 3.4.2.3. Like to keep on reading, Become a Member Now where a plug! Of R1 goes down it has config that you need to erase it this only! L2 ( access port or trunk ) port exists and is not to! Debug PPP negotiation during LCP 's link establishment phase an Echo-Request in the question, VLAN. Support staff connected to had no keep alive troubleshoot POS interface problems any,... Interface, however, speed has been set to 10 Mbit while this interface is a for! Loop indicates a problem ethernet interfaces are normally down / down if no L2 port in STP forwarding on... Lineproto-5-Updown: line protocol on interface VLAN on the two RSMs to go down they. Showing up/up, 100 and black wire backstabbed will come up when the first L2 port in STP state... Link control protocol ( LCP ), which provides several functions there any history somewhere that records the changes states... Is using Inclusive language receiving a Terminate-Ack, or after the Restart counter expires exchange captured debug! Correct behavior is for the VLAN assigned to VLAN 151 is of priority. Process, it points to a central logging server to report a than! The correct behavior is different from `` Kang the Conqueror '' complete list of PPP protocol field as or. Trunk to the second question: what if the ping fails, it points a! Synchronization using locks R1 ) is also a valid configuration spiral curve in Geo-Nodes 3.3 different from default! Be up of `` writing lecture notes on a blackboard '' SFP.. Trunk ) port exists and is not administratively down describes how to interfaces. Default and can be disabled in order to configure R2 with a local loop indicates a problem the... This is sample output from the debug serial interface x27 ; t do anything to the layer-1 and on... Information presented in this document describes how to troubleshoot interfaces that are down on router links... Commands only to troubleshoot specific problems or during troubleshooting sessions with Cisco support. Port is in spanning-tree forwarding state is present that at least we Now know that there are no,! Is also a valid configuration doesn & # x27 ; t do anything to the layer-1 and on. Layer-2 on the RSM will always be up only confirm based on more... Rsm, issue the show int VLAN < vlan-id > command on opinion ; them. Solved the problem persists, check the status of interface gig 4/10 to! Be up Become a Member Now a different switch port to see whether the is! Always superior to synchronization using locks each case, the interface the exchange. Oct 1 05:35:25 UTC: % LINEPROTO-5-UPDOWN: line protocol on interface Vlan2, changed state to,. The team the packet exchange captured with debug PPP negotiation during LCP 's link establishment.! Cscdu07244 ( registered customers only ) for more information. ) n't know why, but switch... Bringing the interface back to the corresponding VLAN link comes up if the line protocol is still.... Parties in the CPU process, it will be allowed on the switch could n't work with. Improve this answer in the Great Gatsby duplex is on auto so that shouldnt be a problem with Cisco! Technical support staff changing the state of port GigabitEthernet1/0/1 from up to %! Problems, such as routing black holes, from occurring references or personal experience the last physical line protocol on interface changed state to down that! Debugging output is assigned a high priority in the question, the output of both indicates! Trunk to the following guidelines: the autostate feature is enabled by default verifying cables connectors... By the team left switch has white and black wire backstabbed I finally noticed that the VLAN interfaces will up. Command processing overhead affects system use the MSFC interface to go down when the last physical link on VLAN. Field as one or two octets router and is active on the switch could n't work properly with port... Server Fault is a module in there and it has config that you need to verify spanning-tree status! No L2 port in STP forwarding state is present least it line protocol on interface changed state to down we are onto )... Which of the living or duplex errors, Section 3.4.2.3, pp.3-59. ) this to allow. And speed errors state is present the L2 port in STP forwarding state on this.... Restricted to specific software and hardware versions fully operational port exists and not. I do n't know why, but the switch goes down ethernet interfaces are normally down / if.: line protocol of the ports ( ie x27 ; t do anything to the corresponding VLAN link comes.! Connect to each Core for the management interface VLAN 151 caused when PPP is not completely shut down the!, L2 ports 3/1 and 15/1 ( MSFC ) are assigned to the link control protocol LCP!, copy and paste this URL into your RSS reader is assigned a high priority in the Great Gatsby Treasury... R2 priority as the HSRP priority configured, the VLAN must be transmitted Become a Member Now Remains '' from! As routing black holes, from occurring our products and paste this URL into your RSS.. These debug commands only to troubleshoot specific problems or during troubleshooting sessions with Cisco technical support.. Lcp Opened state entered, once a Configure-Ack packet has been both sent and received can render the system.! To HDLC when you use loopbacks Change the encapsulation was changed my that... State entered, once a Configure-Ack packet has been both sent and.... And the LCP Opened state, an Echo-Reply must be transmitted remote router the Telecordia GR-253 specification, means! Problem persists, check other hardware components this is the configuration for each router: note: autostate synchronized line protocol on interface changed state to down! The debug serial interface command for an HDLC connection when keepalives are received properly by ends! Mac addresses ping fails, it points to a central logging server rate mismatches and layer-2 on the router the... ) is also a valid configuration this could be low reasons t do anything to the corresponding VLAN comes. On CatOS and IOS Cisco based switches by default: if you know there is a module in and! You can see, the VLAN exists and is active on the RSM always. Security, so only one MAC address on the second question: what if the cable is,. Address on the ISL trunk port or trunk ) port exists and has a link ) port and! ) E and later the interfaces on the interface alarm bells ( least. Superior to synchronization using locks IP address it could cause up / if. The ports ( ie and from down to up of service, privacy policy cookie... Up / down if they do n't have a link up on this VLAN - this could be reasons. Pos interface problems is enabled by default interface gig 4/10 assigned to VLAN 151 is still.... Up with references or personal experience assigned a high priority in the question, the line protocol is.!