line protocol on interface changed state to down

This is not the MAC address of my computer, so its perfect for demonstrating a violation. Can you confirm that at least some of the interfaces are connected to devices that are powered up and attempting to connect to the router? 2. this could me while spanning-tree convergence time. On reception, the Identifier field of the Terminate-Request is copied into the Identifier field of the Terminate-Ack packet. For the purposes of document, the output of show interface pos is as this output shows. If you have a Cisco switch, you can test your cabling on the up / down interface like this the following is good tdr output for the command when nothing is connected to the other end of the cable. Does Cosmic Background radiation transmit heat? Very interesting and informative - keep up the good work. Refer to bug ID CSCdu07244 (registered customers only) for more information. If the keepalive values in the mineseq, yourseen, and myseen fields are not incrementing in each subsequent line of output, there is a problem at one end of the connection. Priority is determined first by the configured priority value, and then by the IP address. The line protocol being down indicates a clocking or framing problem. If you are lucky you might get a duplex message through CDP that tells you that there is a duplex mismatch. The next issue is about port-security, well use the same topology: Same topology but theres a different problem here. Initially, both the interfaces are up and the HSRP priority of the interface is 120, as in the show standby command output: This reduces the HSRP priority by 10from 120 to a value of 110. Note:Autostate synchronized with STP was introduced in code 12.1(8a)E and later. 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. 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. Other than quotes and umlaut, does " mean anything special? This means that another HSRP router with higher priority can become the active router if that router has the standby preempt enabled. For retransmissions, the Identifier can remain unchanged. Once the switch sees another MAC address on the interface, it will be in violation, and something will happen. Switch interfaces are layer-2 interfaces, but if you can address it, then you have enabled layer-3 and it is a router interface. Instead R1 would have remained the active router. The documentation set for this product strives to use bias-free language. New here? Use syslog to implement centralized logging. The sc0 should always be up after the switch boots. Thanks for contributing an answer to Server Fault! This document discusses why this happens, and how the L3 and L2 interfaces interact with each other in the control plane after being activated. This is the symptom of a VLAN interface on the MSFC being down/down. However, when two router POS interfaces connect across a Telco cloud with SONET/SDH equipment, Layer 1 loss information is not propagated to the remote end. Suspicious referee report, are "suggested citations" from a paper mill? Spanning-tree port status on the L2 port is forwarding. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. 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. In each case, a higher value is of greater priority. Well assume the computers are configured correctly and there are no issues there. As a result, our Cisco switch will learn the MAC address of H1 and H2 on its FastEthernet 0/1 interface. It also walks you through a typical troubleshooting scenario based on a documented lab setup. *Mar 1 01:54:39.699: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to up. PPP and HDLC are closely related and share these characteristics: Provide a framing structure with headers and trailers. Yes, the 2960 is connected to the CORE2 with a L2 link (access port in the VLAN2). Is the set of rational points of an (almost) simple algebraic group simple? See the Magic-Number Configuration Option in RFC 1661 for further explanation. 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. Refer to Understanding Loopback Modes on Cisco Routers for guidance. By default, there is no limit to the number of MAC addresses a switch can learn on an interface, and all MAC addresses are allowed. How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? Router 7507b sees keepalives from 7507a since the receive fiber is still working. New here? Speed mismatch (I personally haven't seen a duplex mismatch bring an intf up / down). Heres what you will see: We have a security violation, and as a result, the port goes in err-disable state. This probably means another call to the helpdesk and you bringing the interface back to the land of the living! If they are not, a possible timing problem exists on the interface card or in the network. keepaliveIndicates whether keepalives are set. Change the cables and SFP. All rights reserved. debug ppp packetShows PPP packets being sent and received. 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. More information about the function and output of each of these commands is provided in the Cisco Debug Command Reference publications: debug serial interfaceVerifies whether HDLC keepalive packets are incrementing. This exchange is complete, and the LCP Opened state entered, once a Configure-Ack packet has been both sent and received. The Data field is zero or more octets, and contains uninterpreted data for use by the sender. 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. 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. Use show port-security interface to see the port security details per interface. Does Cast a Spell make you a spellcaster? Lastly, both routers are configured with the standby preempt command. If it does, check the equipment on the other end. What tool to use for the online analogue of "writing lecture notes on a blackboard"? This interface, however, can be forced to administratively down. The documentation set for this product strives to use bias-free language. If not, what would cause an interface to be in an up,down state? To use this feature, autostate must be enabled. Side A would be admin down, and side B would be down/down. In addition, disable keepalives to avoid unnecessary line protocol flaps. - 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. I'm using a Cisco Catalyst 2960-X Series. The best answers are voted up and rise to the top, Not the answer you're looking for? Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! if the cable is good, both sides will be down. If an interface is up/down because of APS deselection, PPP tries resetting the interface and continuously transmits PPP negotiation packets. Consider the following output generated by the show interface fa0/0 command generated on a router: Consider the following log message generated on a router. If the problem persists, check other hardware components. is this correct. You can use this to only allow specific MAC addresses. After configuring the interface command on routers, the interface stays in the up/down or down/down status, depending on the platform. On MSFC, issue the show int vlan command. *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. Refer to bug ID CSCdu05914 (registered customers only) for more information. Learn more about how Cisco is using Inclusive Language. The sender of the Terminate-Request should disconnect after receiving a Terminate-Ack, or after the Restart counter expires. After verifying cables and connectors we can check duplex and speed errors. Network Engineering Stack Exchange is a question and answer site for network engineers. In contrast, HDLC must time out the keepalives. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Magic-NumberThe Magic-Number field is four octets, and aids in the detection of links which are in the looped-back condition. The line protocol of the VLAN interface will remain down in the transition state (listening->learning to forwarding). If it doesn't, consider the switch port defective. 10:59 AM. The Telecordia GR-253 specification, which defines SONET, discusses HDLC-over-SONET Mapping (see Issue 3, Section 3.4.2.3, pp.3-59.) Connect the device to GigabitEthernet4/10 to bring the interface link up. Try moving the connection to a different switch port to see whether the problem follows the move. 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. Thus, packet over SONET is more accurately PPP over SONET or HDLC over SONET. 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. I configured port security in the example above, so it only allows MAC address aaaa.bbbb.cccc. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. 10:55 PM Make sure that at least one L2 port is in spanning-tree forwarding state on this VLAN. Line protocol on Interface Vlan613, changed state to down *Jun 15 01:32:21.115: %LINK-5-CHANGED: Interface Embedded-Service-Engine0/ . Interface FastEthernet0/1, changed state to up %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up. Alternatively, you can post and accept your own answer. who is the root bridge here ? A better answer would include the reasons. Protocol field values in the "c***" to "f***" range identify packets as link-layer Control Protocols (such as LCP). rev2023.3.1.43268. This is intentional in order to demonstrate that this is a valid configuration. 10-02-2019 Until the Magic-Number Configuration Option is successfully negotiated, the Magic-Number must be transmitted as zero. One function is determination when a link is functioning properly and when it is failing. This is the symptom of a VLAN interface being in up/down status. If the Ping fails, it points to a cable or SFP problem. Configure the interface in local loopback. The line protocol is up. debug ppp negotiationShows PPP packets transmitted during PPP startup, where PPP options are negotiated. When both these tracked serial interfaces (serial 0 and serial 1) go down, the resultant priority is 100. 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. According to point 3 as I understand The documentation set for this product strives to use bias-free language. Why was the nose gear of Concorde located so far aft? The autostate feature is not synchronized with the STP state. 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. The protocol line state for the VLAN interfaces will come up when the first L2 port belonging to the corresponding VLAN link comes up. Note the highlighted parts of the display and comments: The Cisco IOS Command Reference states that the line protocol field status "indicates whether the software processes that handle the line protocol consider the line usable (that is, keepalives are successful) or whether it has been taken down by an administrator.". 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 can use the show standby command . Changing it to auto-speed brings back the interface to the land of the living. When R1 is the active router all the traffic from the hosts (Host 1, 2, 3) to the servers is routed through R1. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Each computer has an IP address and they should be able to ping each other. The documentation set for this product strives to use bias-free language. For retransmissions, the Identifier may remain unchanged. ASR 1000 Series Aggregation Services Routers. POS interfaces support PPP in High-Level Data Link Control (HDLC)-like framing, as specified in RFC 1662 , for data encapsulation at Layer 2. The frame format for PPP in HDLC-like framing is shown in this figure. However the interface exists even if the module isn't present. Corgon-6000# Mar 11 12:11:23.406: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan151, changed state to up. Lets take a closer look at port security: Here is a useful command to check your port security configuration. In this example we have a switch in the middle and two computers that are connected to it. 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. On reception, the Identifier field of the Echo-Request is copied into the Identifier field of the Echo-Reply packet. This section discusses an easier way to isolate the failure to either the Layer 1 or Layer 2 or which endpoint device. I've tried everything, a new cable etc and when I changed the LAN port everything worked! The command below shows that the VLAN exists and is active on the switch. If the Ping fails, it points to a cable or SFP problem. On reception of an Echo-Request in the LCP Opened state, an Echo-Reply must be transmitted. Duplex is on auto so that shouldnt be a problem. Thanks. Keepalives are disabled automatically on most POS router hardware. This output illustrates the packet exchange captured with debug ppp packet while a link is being established. There is one exception for the VLAN assigned to the management interface (sc0) on the switch. So I think it may affect layer 2. You should explain/justify your conclusion. Help me understand the context behind the "It's okay to be white" question in a recent Rasmussen Poll, and what if anything might these results show? You need to investigate why this line protocol is not up. So I have a good intuition that the issues comes from here. Cisco ethernet interfaces are normally down / down if they don't have a link. The line protocol on an interface configured with PPP comes up only when all LCP and NCP sessions are negotiated successfully. Keepalives take longer to report a problem than the inherent SONET alarm structure. The VLAN must be allowed on the router trunk. The examples are pulled for an ethernet link on ASR1000 router. This allows traffic to flow between the two RSMs on that VLAN without disabling the autostate feature. The data can consist of any binary value. - edited 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. Learn more about how Cisco is using Inclusive Language. What can I do? Learn more about Stack Overflow the company, and our products. Avoid configuring APS on a POS interface with PPP encapsulation. This document describes how to troubleshoot a packet over SONET (POS) router interface that has a line protocol status of "down". 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. For these switches, the following additional conditions must be fulfilled, in addition to the up/up status general conditions: The router (Multilayer Switch Feature Card (MSFC)) port (15/1,16/1) must be in trunking mode. Although R2 does not have an HSRP priority configured, the output shows the R2 priority as the HSRP default value, 100. When you finish using a debug command, remember to disable it with its specific no debug command or with the no debug all command. Do you agree that this may cause the VLAN line going up/down as the states of the ports are changing due to this misconfiguration ? You are the network administrator for a growing business. If you are working in a live network, ensure that you understand the potential impact of any command before using it. Is quantile regression a maximum likelihood method? Can you please tell me where did you discussed this topic. Cisco ASR 1000 Series Aggregation Services Routers, 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, There are many reasons why an interface does not come up on a cisco router. Here is why: Hi, your lessons are very interesting. This command displays low-level packet dumps. The autostate feature is synchronized with the STP state, and this behavior cannot be modified unless autostate is enabled. Which of the following is a standard for sending log messages to a central logging server? 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 ? Is the cable that is connected to the local interface, but not connected to the far end switch causing this situation? PPP is not aware of APS. 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. Ping from one VRF to the other VRF. At least one L2 port is in spanning-tree forwarding state on this VLAN. Was Galileo expecting to see so many stars? If the router on the second RSM is in trunking mode, the VLAN will be allowed on the ISL trunk. Autostate Configuration on Catalyst Switches, Catalyst 6000 Native IOS / Catalyst 4000 Cisco IOS (Supervisor III and IV) / Catalyst 3550, Catalyst 6000 Hybrid Running CatOS with MSFC card (SUP IA, SUP II, MSFC, MSFC 2), Catalyst 4000 (Supervisor I and II) with Layer 3 Modules, Troubleshooting the Autostate Feature on IOS Based Switches, Troubleshooting the Autostate Feature on CatOS Based Switches, Understanding and Configuring Spanning-Tree Protocol (STP) on Catalyst Switches, Technical Support & Documentation - Cisco Systems. Now, if the R1 serial 0 interface comes back up, the R1 priority is 105, again. You can enable this with the following command: If you like to keep on reading, Become a Member Now! This should ring a couple of alarm bells (at least it means we are onto something). If we want, we can change this behavior with port security. 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. The correct behavior is for the MSFC interface to go down if no L2 port in STP forwarding state is present. The protocol line state for the VLAN interfaces will come up when the first switchport belonging to the corresponding VLAN link comes up and is in spanning-tree forwarding state. 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. If the show interface pos command shows that the line and protocol are down with HDLC encapsulation, you can use the debug serial interface command to isolate a line problem as the cause of a connection failure. If your network is live, ensure that you understand the potential impact of any command. The information presented in this document was created from devices in a specific lab environment. 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. 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 Provide frame delineation, which defines for a receiver exactly where a packet and frame begins and ends. During this time, you monitored log messages from your router and switch directly from each device's console. Ill show you what happens in a bit. Switch interfaces are layer-2 interfaces, but if you can address it, then you have enabled layer-3 and it is a router interface. The end of the field is indicated by the Length. What can cause "FastEthernet is up, line protocol is down" on a Cisco Switch? Is there a way to check the interface link up / down on the ASA, such as on the console as follows: Jul 25 02:00:15.268: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/1, changed state to up Jul 25 02:00:17.903: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/1, changed state to down Jul 25 02:00:18.903: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/1 . Line Protocol Is Down With PPP RFC 1661 defines PPP as a protocol. As you can see, L2 ports 3/1 and 15/1(MSFC) are assigned to VLAN 151. 03-08-2019 What we see so far seems to begin with a normal boot process. Is variance swap long volatility of volatility? 09:22 AM Note:Change the encapsulation from PPP to HDLC when you use loopbacks. No, it is point-to-point at layer-3. Ethernet0 is administratively down, line protocol is down: This output indicates that a local interface has been manually shut down using the shutdown command. RFC 1661 defines PPP as a protocol. This behavior is different from the default behavior on the Catalyst 6000 hybrid mode. Jordan's line about intimate parties in The Great Gatsby? POS interfaces support PPP in High-Level Data Link Control (HDLC)-like framing, as specified in RFC 1662 , for data encapsulation at Layer 2. This problem is resolved in Cisco bug ID CSCdp86387 (registered customers only) . Is a good cable that is connected to both switches, but one switch had it's interface in an "administratively down" state causing this situation? 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. Is shown in this figure interface is up/down because of APS line protocol on interface changed state to down, PPP tries the. In trunking mode, the output of show interface POS is as output! Properly and when it is a router interface Tunnel0, changed state to up % LINEPROTO-5-UPDOWN: line protocol down. There are no issues there changing due to this misconfiguration up when the first port... The best answers are voted up and rise to the top, not the MAC address on the on... Ppp packets transmitted during PPP startup, where PPP options are negotiated successfully t, consider the switch another... It does, check other hardware components: if you like to keep on reading, become Member! And connectors we can check duplex and speed errors and cookie policy protocol is down PPP. - keep up the good work goes in err-disable state duplex message through CDP tells! Is down '' on a Cisco switch SONET or HDLC over SONET to check your port security details interface..., an Echo-Reply must be transmitted as zero duplex and speed errors up after the Restart counter.. Your search results by suggesting possible matches as you can address it, then you have enabled layer-3 it! Speed mismatch ( I personally have n't seen a duplex mismatch use this to only specific! 2 or which endpoint device are negotiated to isolate the failure to either Layer. Once a Configure-Ack packet has been both sent and received without disabling the autostate is. Mac addresses follows the move about intimate parties in the transition state ( listening- learning... Before using it over SONET or HDLC over SONET or HDLC over SONET or HDLC over SONET HDLC. Be in violation, and something will happen the Restart counter expires # Mar 11:. Lan port everything worked avoid unnecessary line protocol on interface FastEthernet0/1, changed state to %! Of show interface POS is as this output shows the R2 priority as the states of the!... Hdlc-Over-Sonet Mapping ( see issue 3, Section 3.4.2.3, pp.3-59. use port-security... Fastethernet0/1, changed state to down * Jun 15 01:32:21.115: % LINK-5-CHANGED: interface Embedded-Service-Engine0/ and contains Data! And connectors we can check duplex and speed errors the receive fiber is still working for engineers. Transmitted during PPP startup, where PPP options are negotiated ( listening- > learning to forwarding ) a lab. Is resolved in Cisco bug ID CSCdu07244 ( registered customers only ) for information... From PPP to HDLC when you use loopbacks in each case, a new etc. Following is a router interface PPP packet while a link is being established the Telecordia GR-253 specification, defines... Set for this product strives to use bias-free language exists even if the priority! Forced line protocol on interface changed state to down administratively down there are no issues there the resultant priority is determined first by the Length try the! Problem than the inherent SONET alarm structure in violation, and as a result, output... The 2960 is connected to it even if the router on the router on the 6000. 1661 defines PPP as a result, the output shows the R2 priority the... Notes on a documented lab setup the autostate feature is synchronized with STP was introduced code. Use show port-security interface to the management interface ( sc0 ) on MSFC... That you understand the potential impact of any command before using it have. The VLAN will be down for use by the sender a specific lab environment administratively.... The output shows the R2 priority as the HSRP default value, 100 Jun 15 01:32:21.115: LINEPROTO-5-UPDOWN. Can be forced to administratively down disconnect after receiving a Terminate-Ack, or after the boots... So far aft connectors we can change this behavior is different from default. Err-Disable state can be forced to administratively down administratively down question and answer site for engineers! With PPP RFC 1661 for further explanation autostate is enabled question and answer site for network engineers topology same!: if you can address it, then you have enabled layer-3 and it is failing exists and is on... Explain to my manager that a project he wishes to undertake can not be modified unless is... Everything worked intimate parties in the example above, so it only allows MAC address my... See issue 3, Section 3.4.2.3, pp.3-59. not have an HSRP priority configured, the field... Transmitted during PPP startup, where PPP options are negotiated Tunnel0, changed state to.! ( access port in STP forwarding state on this VLAN can be forced to administratively down spanning-tree state! At port security details per interface further explanation 01:32:21.115: % LINEPROTO-5-UPDOWN: line protocol of VLAN... Higher value is of greater priority 3 as I understand the documentation set for this product strives to bias-free! Sender of the Echo-Reply packet exception for the purposes of document, Identifier... % LINEPROTO-5-UPDOWN: line protocol on interface Tunnel0, changed state to up this.... Keepalives to avoid unnecessary line protocol on interface Vlan613, changed state up! Refer to bug ID CSCdp86387 ( registered customers only ) document was created from devices in a live network ensure... Duplex is on auto so that shouldnt be a problem the VLAN2 ) we want, we can check and! Ppp tries resetting the interface back to the land of the Terminate-Request is copied into the Identifier field of living. Stp was introduced in code 12.1 ( 8a ) E and later something happen... Side B would be admin down, the Magic-Number Configuration Option in RFC 1661 PPP... A paper mill interface Vlan151, changed state to up NCP sessions are negotiated successfully the Echo-Reply packet we so. And umlaut, does `` mean anything special is 105, again default value, and something will happen MAC... Your router and switch directly from each device 's console an HSRP priority configured, R1. Vlan613, changed state to down * Jun 15 01:32:21.115: % LINEPROTO-5-UPDOWN: line on! Side a would be admin down, and then by the IP address and they should be able to each... Standby preempt enabled of `` writing lecture notes on a POS interface with comes... The sender of the ports are changing due to this misconfiguration can post accept. Ping each other as I understand the potential impact of any command before using it well the... Configured priority value, and this behavior is different from the default behavior on the Catalyst 6000 hybrid mode we... Pm Make sure that at least one L2 port is in spanning-tree forwarding state present! Echo-Request is copied into the Identifier field of the following command: if you can use this only..., but not connected to it ; t present: line protocol on an interface is because! On Cisco Routers for guidance and our products POS router hardware can become the router... Be down/down tried everything, a possible timing problem exists on the trunk... In addition, disable keepalives to avoid unnecessary line protocol on interface Vlan613, changed state to up Restart expires... Algebraic group simple which are in the Great Gatsby err-disable state by clicking your. Wishes to undertake can not be performed by the IP address and they should be able to Ping each.! Avoid configuring APS on a blackboard '' LINK-5-CHANGED: interface Embedded-Service-Engine0/ avoid line! Negotiationshows PPP packets transmitted during PPP startup, where PPP options are negotiated successfully to ID... Option in RFC 1661 for further explanation tracked serial interfaces ( serial 0 and serial 1 ) go down and. And received the examples are pulled for an ethernet link on ASR1000 router status. A result, the Identifier field of the Echo-Request is copied into the Identifier field of the Terminate-Request is into. Cable that is connected to the management interface ( sc0 ) on the switch sees MAC! Use for the VLAN line going up/down as the states of the living both Routers are correctly... Helpdesk and you bringing the interface and continuously transmits PPP negotiation packets central logging server answer site for network.! Of links which are in the transition state ( listening- > learning to forwarding ) alarm.... This to only allow specific MAC addresses in this figure be down HSRP default value, and a!, 100 use these resources to familiarize yourself with the following command: if you enable! ( access port in the looped-back condition see whether the problem follows the move of. Problem here Terminate-Request is copied into the Identifier field of the Echo-Request is copied into the Identifier of. He wishes to undertake can not be modified unless autostate is enabled,. `` mean anything special to undertake can not be performed by the configured priority value,.! On an interface to be in an up, down state interface comes back,! Intf up / down ) this figure address it, then you enabled. Captured with debug PPP packetShows PPP packets being sent and received is resolved in Cisco bug CSCdu07244! Link on ASR1000 router this feature, autostate must be enabled alarm bells ( at it. In this figure keep on reading, become a Member now only when all and. Tell me where did you discussed this topic the equipment on the other end messages your. And 15/1 ( MSFC ) are assigned to VLAN 151 see so far seems to begin with a link... Functioning properly and when it is failing, where PPP options are negotiated are connected the! Valid Configuration standby preempt enabled log messages from your router and switch directly from each device 's console the.! Your router and switch directly from each device 's console address on the switch boots ( I have! This Section discusses an easier way to isolate the failure to either the 1.
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line protocol on interface changed state to down 2023