VLAN trunking between Juniper EX -> Cisco Catalyst -> and Cisco Router. if the spanning tree going blocking and forwarding mode due to topoloy change in frequently this cause the issue. 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. On MSFC, issue the show int vlan command. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! Share Improve this answer This document is not restricted to specific software and hardware versions. The line protocol being down indicates a clocking or framing problem. This diagram illustrates the protocol stack used on a POS interface. If the cable is faulty, it could cause up / down status. POS interfaces support multiple encapsulations - HDLC, PPP and Frame Relay. 09:22 AM By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. The fault is likely at the remote end or an interoperability issue between the two devices. The interfaces that Im working with are both showing up/up. When one side is unplugged, both LEDs go green. For this reason, use debug commands only to troubleshoot specific problems or during troubleshooting sessions with Cisco technical support staff. Ill show you what happens in a bit. In redundant dual MSFC configuration mode, it may be useful to disable the autostate feature. Suspicious referee report, are "suggested citations" from a paper mill? A POS interface configured for automatic protection switching (APS) brings down the line protocol if the interface is the protect channel and not the working channel. 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.". Configure the interface in local loopback. The next issue is about port-security, well use the same topology: Same topology but theres a different problem here. Moreover, it is best to use debug commands during periods of low network traffic and fewer users. If the R1 Serial 0 interface goes down, the R1 HSRP priority is decreased by 10. Network Engineering Stack Exchange is a question and answer site for network engineers. This diagram from RFC 1661 illustrates the format of a PPP keepalive packet. To sugget better, we would like to see your configuraiton and topology ? Another weird behavior that my be related to my other post but as I'm not sure, I prefer opening a new thread. 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 frame format for PPP in HDLC-like framing is shown in this figure. The best answers are voted up and rise to the top, Not the answer you're looking for? Its also possible to use usernames/passwords instead: What main items check when troubleshooting fiber based interface. 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? Refer to Cisco bug IDCSCdp72834 for more information. Is variance swap long volatility of volatility? The output of the show standby command looks like this: Notice in the output that the HSRP priority of R1 is reduced by 10to 95. 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. 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. Lets walk through a couple of scenarios. Priority is determined first by the configured priority value, and then by the IP address. Was Galileo expecting to see so many stars? If the line protocol of the specified interface goes down, the HSRP priority is reduced. 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. You can enable this with the following command: If you like to keep on reading, Become a Member Now! Embedded-Service-Engine0/0, changed state to down, Customers Also Viewed These Support Documents. Line protocol on Interface Vlan changed state to up. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. You can see the violation mode is shutdown and that the last violation was caused by MAC address 0090.cc0e.5023 (H1). RFC 2615 specifies the use of PPP encapsulation over SONET or SDH links. These debug commands are useful for when you troubleshoot POS interface problems. Interface link parameters must match at both ends of the link. Asking for help, clarification, or responding to other answers. Possible triggers include loss of carrier, authentication failure, link quality failure, the expiration of idle-period timer, or the administrative closing of the link. Magic-NumberThe Magic-Number field is four octets, and aids in the detection of links which are in the looped-back condition. 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 ? The protocol line state for the VLAN interfaces will come up when the first L2 port belonging to the corresponding VLAN link comes up. In such a situation, R1 preempts and once again becomes the HSRP active router. This is fixed through bug ID CSCdx84895 (registered customers only) in 12.1.13E and later releases. The line protocol on an interface configured with PPP comes up only when all LCP and NCP sessions are negotiated successfully. In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. The data may consist of any binary value. Switch interfaces are layer-2 interfaces, but if you can address it, then you have enabled layer-3 and it is a router interface. Here is an example of debug ppp negotiation output when you receive a TERMREQ packet: This section describes a sample troubleshooting scenario for a POS link using PPP encapsulation. 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. when HSRP failing - this could be low reasons. *Jan 2 00:00:04.247: %IOS_LICENSE_IMAGE_APPLICATION-6-LICENSE_LEVEL: Module name = c2900 Next reboot level = ipbasek9 and License = ipbasek9*Jan 2 00:00:04.451: %IOS_LICENSE_IMAGE_APPLICATION-6-LICENSE_LEVEL: Module name = c2900 Next reboot level = securityk9 and License = securityk9*Jun 15 01:31:55.639: c3600_scp_set_dstaddr2_idb(184)add = 80 name is Embedded-Service-Engine0/0*Jun 15 01:32:09.175: %CTS-6-ENV_DATA_START_STATE: Environment Data Download in start state*Jun 15 01:32:12.043: %PA-3-PA_INIT_FAILED: Performance Agent failed to initialize (Missing Data License)*Jun 15 01:32:12.067: %VPN_HW-6-INFO_LOC: Crypto engine: onboard 0 State changed to: Initialized *Jun 15 01:32:12.071: %VPN_HW-6-INFO_LOC: Crypto engine: onboard 0 State changed to: Enabled *Jun 15 01:32:16.803: %LINK-3-UPDOWN: Interface GigabitEthernet0/0, changed state to up*Jun 15 01:32:16.803: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to up*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*Jun 15 01:32:17.851: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to up*Jun 15 01:32:18.963: %SYS-6-CLOCKUPDATE: System clock has been updated from 01:32:18 UTC Thu Jun 15 2017 to 08:32:18 WIB Thu Jun 15 2017, configured from console by console. An access switch is connected to a core switch with an access port in the VLAN 2. The examples are pulled for an ethernet link on ASR1000 router. This interface, however, can be forced to administratively down. Oct 1 05:35:25 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan2, changed state to down. Learn more about how Cisco is using Inclusive Language. This is sample output from the debug serial interface command for an HDLC connection when the remote interface is shut and the local interface misses more than three keepalives. Keepalives are disabled automatically on most POS router hardware. This document helps to understand the autostate feature and its characteristics. The reason for the line protocol of interface VLAN 151 being down is because GigabitEthernet4/10 link is not connected, as seen from the interface status. No, it is point-to-point at layer-3. Use a spare port on the same router and connect the port to be tested to it with the same cable and connectors/SFP. As a result, our Cisco switch will learn the MAC address of H1 and H2 on its FastEthernet 0/1 interface. If you are unlucky its possible that your interface goes down. Use debug serial interface to confirm this. What we see so far seems to begin with a normal boot process. Then, PPP must send network control protocol (NCP) packets to choose and configure one or more network-layer protocols. The information presented in this document was created from devices in a specific lab environment. We have a security violation, and as a result, the port goes in err-disable state. - 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. The router VLAN interfaces have to fulfill the following general conditions to be up/up: VLAN exists and is in active status on the switch VLAN database. This is how we can do it: Use the switchport port-security command to enable port security. - Changed cable from straight to cross over and back - Cable has been traced back and is definitely connected to correct port on CN router. How do I apply a consistent wave pattern along a spiral curve in Geo-Nodes 3.3? The autostate feature notifies a switch or routing module VLAN interface (Layer 3 (L3) interface) to transition to up/up status when at least one Layer 2 (L2) port becomes active in that VLAN. this can only confirm based on some more inputs. If it doesn't, consider the switch port defective. A sample output is shown below. 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. In order to establish communication over a point-to-point link, each end of the PPP link must first send LCP packets to configure and test the data link. The router is now looped back to itself. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. At this point the R2 HSRP priority is higher than R1, and R2 takes over as the active router. 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. debug ppp errorsShows PPP errors (such as illegal or malformed frames) associated with PPP connection negotiation and operation. is this correct. The interface will be in up/down state? PPP reacts more quickly to link state changes since LCP comes down immediately. Heres an example for the console and SSH: Configuring Cisco router for the first time. Perform a local loop test first, and then a remote test. the interface will be on down/down state? Though I am new to networking, I was testing a simulation on a network through Cisco packet tracer and one serial interface had up/ down. Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? Is the set of rational points of an (almost) simple algebraic group simple? All rights reserved. Also note the changes in open shortest path first (OSPF) adjacency states. 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, . debug ppp packetShows PPP packets being sent and received. If we want, we can change this behavior with port security. The documentation set for this product strives to use bias-free language. When a lower priority active router receives a Coup message or a Hello message from an active, higher priority router, the router changes to the Speak state and sends a resign message. Use the switchport port-security mac-address command to define the MAC address that you want to allow. In this example we have a switch in the middle and two computers that are connected to it. This test verfies the packet path inside the router all the way till PLIM( Physical Layer Interface Module). Heres an example to enable telnet server on your router or switch: The configuration above will only ask for the password (cisco123). The latest implementation of the autostate feature allows synchronization to Spanning-Tree Protocol (STP) port status. Protocol field values in the "c***" to "f***" range identify packets as link-layer Control Protocols (such as LCP). As you can see, it is now down. "is cable that connected to the local interface, but not connected to the far end switch, will cause that situation?" Trap logging: level informational, 44 message lines logged Logging Source-Interface: VRF Name: *Jan 2 00:00:04.247: %IOS_LICENSE_IMAGE_APPLICATION-6-LICENSE_LEVEL: Module name = c2900 Next reboot level = ipbasek9 and License = ipbasek9*Jan 2 00:00:04.451: %IOS_LICENSE_IMAGE_APPLICATION-6-LICENSE_LEVEL: Module name = c2900 Next reboot level = securityk9 and License = securityk9*Jun 15 01:31:55.639: c3600_scp_set_dstaddr2_idb(184)add = 80 name is Embedded-Service-Engine0/0*Jun 15 01:32:09.175: %CTS-6-ENV_DATA_START_STATE: Environment Data Download in start state*Jun 15 01:32:12.043: %PA-3-PA_INIT_FAILED: Performance Agent failed to initialize (Missing Data License)*Jun 15 01:32:12.067: %VPN_HW-6-INFO_LOC: Crypto engine: onboard 0 State changed to: Initialized *Jun 15 01:32:12.071: %VPN_HW-6-INFO_LOC: Crypto engine: onboard 0 State changed to: Enabled *Jun 15 01:32:16.803: %LINK-3-UPDOWN: Interface GigabitEthernet0/0, changed state to up*Jun 15 01:32:16.803: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to up*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*Jun 15 01:32:17.851: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to up*Jun 15 01:32:18.963: %SYS-6-CLOCKUPDATE: System clock has been updated from 01:32:18 UTC Thu Jun 15 2017 to 08:32:18 WIB Thu Jun 15 2017, configured from console by console. as in example? %LINEPROTO. Here is why: Hi, your lessons are very interesting. (Refer to the APS Technology Support Page for more information.). Lets take a look at the following situation: In the topology above, someone connected a cheap (unmanaged) switch that they brought from home to the FastEthernet 0/1 interface of our Cisco switch. *Mar 1 00:07:19.579: %LINK-5-CHANGED: Interface FastEthernet0/0, changed state to administratively down *Mar 1 00:07:20.587: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to 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. At least one L2 (access port or trunk) port exists and has a link up on this VLAN. Once each of the chosen network-layer protocols has been configured, datagrams from each network-layer protocol can be sent over the link. If you are lucky you might get a duplex message through CDP that tells you that there is a duplex mismatch. Of course, we dont want people to bring their own switches and connect them to our network, so we want to prevent this from happening. Line protocol is down on Cisco Router / IOS 12.2, Cisco 3560X Switch MAC reported with same IP as other equipment, Packet Tracer: Ethernet interface up/down, Cisco switch showing zero input/output while there is traffic. Autostate is implemented on CatOS and IOS Cisco based switches by default. 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. Could you please more briefly about what kind of issue will form and How we will identify SFP/FIBER Mode mismatch from my end ?? You need to verify spanning-tree port status on the L2 port (should be forwarding). 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. On reception of an Echo-Request in the LCP Opened state, an Echo-Reply must be transmitted. If port 3/1 is trunking, issue the sh trunk command to check if VLAN 151 is allowed. What are some tools or methods I can purchase to trace a water leak? You should explain/justify your conclusion. And besides, please elaborate when you mean "router totally down". Can you please tell me where did you discussed this topic. 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. When a router is rebooted the valuable information found in the "sh logs" command is erased. If it doesn't, consider the switch port defective. Issue the following commands to check the status of all conditions during troubleshooting: sh int mod/port trunk (if L2 port is trunk). Additionally, you should keep the following in mind when troubleshooting fibre based interfaces: Hi Laz, Although R2 does not have an HSRP priority configured, the output shows the R2 priority as the HSRP default value, 100. 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. Session into the MSFC and verify the status of the VLAN interface again. Change the cables and SFP. If not, what would cause an interface to be in an up,down state? Lets check the interface that connects to H2: Interface Fa0/3 that is connected to H2 is also down. *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. Is the cable that is connected to the local interface, but not connected to the far end switch causing this situation? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Refer toCisco Technical Tips Conventions for more information on document conventions. If this is the case contact Cisco TAC to troubleshoot it further. 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. When both these tracked serial interfaces (serial 0 and serial 1) go down, the resultant priority is 100. what are input errors on the CISCO switch? Line Protocol Is Down With PPP RFC 1661 defines PPP as a protocol. New here? Does Cosmic Background radiation transmit heat? Thanks for contributing an answer to Server Fault! DataThe Data field is zero or more octets, and contains uninterpreted data for use by the sender. And as you can see, the HSRP state is therefore impacted. Very interesting and informative - keep up the good work. Thanks. If you are working in a live network, ensure that you understand the potential impact of any command before using it. ASR 1000 Series Aggregation Services Routers. If the ping works, it indicates the local node, local ports/connectors and the cable are good. Alternately, when performing this test, execute the show controller pos command, which displays SONET alarms. Hi Rene, thanks for the lessons. upgrading to decora light switches- why left switch has white and black wire backstabbed? Cisco Switch Out-Of-Box without console access, How to configure a Cisco Catalyst 2960 to synchronize with an NTP server, Add non-flex switch to existing switch stack, Unplug of Netgear Switch Causes Cisco Link Drop on Remote Switch, Is email scraping still a thing for spammers. 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. Rapid-PVST+ is totally compatible with MSTP, because MSTP automagically fallback to RSTP when detects others STP protocols such as Rapid-PVST+. Lets take a closer look at it: Hmm it says err-disabled. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. 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. 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. 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. Gongratulations Ren, here it is a very useful lesson. Is quantile regression a maximum likelihood method? All rights reserved. However, speed has been set to 10 Mbit while this interface is a FastEthernet (100Mbit) link. Check to make sure that VLAN 151 exists in the VLAN database and is active. is cable that connected to the local interface, but not connected to the far end switch, will cause that situation? Jordan's line about intimate parties in The Great Gatsby? For retransmissions, the Identifier can remain unchanged. 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. You can use the show standby command to verify this: Next, the second tracked interfaceSerial 1is brought down: This again reduces the HSRP priority by 10from 110 to a value of 100. 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. is there a chinese version of ex. When a higher priority router preempts a lower priority router, the router sends a Coup message. HDLC is the default encapsulation type on a POS router interface. Why does the line protocol for this specific VLAN sometimes go up/down ? I wonder what can cause that the first line output of the command "show interfaces" will be: "fastEthernet is up, line protocol is down". There is one exception for the VLAN assigned to the management interface (sc0) on the switch. The VLAN must be allowed on the trunk to the MSFC. Learn more about how Cisco is using Inclusive Language. The open-source game engine youve been waiting for: Godot (Ep. 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. Click here for a complete list of PPP protocol field values . However the interface exists even if the module isn't present. Make sure that at least one L2 port is in spanning-tree forwarding state on this VLAN. Learn more about how Cisco is using Inclusive Language. Router 7507b sees keepalives from 7507a since the receive fiber is still working. rev2023.3.1.43268. The state of R1 is active and the state of R2 is standby. keepaliveIndicates whether keepalives are set. 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. It only takes a minute to sign up. Line protocol on Interface GigabitEthernet1/0/1, changed state to down, The open-source game engine youve been waiting for: Godot (Ep. Enable port 3/1, as shown below. This interface, however, can be forced to administratively down. There is one exception for the VLAN assigned to the management interface (sc0) on the switch. The line protocol on the interface VLAN should now be up. Ping from one VRF to the other VRF. For retransmissions, the Identifier may remain unchanged. When the difference in the values in the myseq and mineseen fields exceeds three, the line goes down and the interface is reset. whick menas that keepalives will not be receiver on the far end. 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. Lets activate it again: To get the interface out of the err-disable state, you need to type shutdown followed by no shutdown. Only typing no shutdown is not enough! 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. What can cause "FastEthernet is up, line protocol is down" on a Cisco Switch? 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. Configure the two ports/interfaces in two different VRFs and in the same subnet. This is the symptom of a VLAN interface on the MSFC being down/down. Ask a question or join the discussion by visiting our Community Forum, Get Full Access to our 758 Cisco Lessons Now, FastEthernet0/1 is down, line protocol is down (notconnect), Half-duplex, Auto-speed, media type is 10/100BaseTX, FastEthernet0/3 is down, line protocol is down (notconnect), Auto-duplex, 10Mb/s, media type is 10/100BaseTX, Port Status : Secure-shutdown, 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, Check the SFP or GBIC status by issuing the. Switch interfaces are layer-2 interfaces, but if you can address it, then you have enabled layer-3 and it is a router interface. 06-14-2017 Refer to the following guidelines: The autostate feature is enabled by default. % LINEPROTO-5-UPDOWN: line protocol for this line protocol on interface changed state to down VLAN sometimes go up/down interface even... Not connected to it a live network, ensure that you understand the potential impact of any before! Are lucky you might get a duplex mismatch will learn the MAC address 0090.cc0e.5023 H1... Duplex message through CDP that tells you that there is a FastEthernet 100Mbit!, copy and paste this URL into your RSS reader resources to familiarize yourself with the guidelines... The next issue is about port-security, well use the same subnet up only all. My other Post but as I 'm not sure, I prefer opening a new thread it! Issue the sh trunk command to define the MAC address 0090.cc0e.5023 ( H1 ) detection of links are. Vlan 151 exists in the looped-back condition the symptom of a VLAN interface again a test. R1 is active and hardware versions spanning-tree protocol ( STP ) port exists and has a link on... Are connected to the far end switch, will cause that situation? for more information on Conventions. Software and hardware versions once each of the link of service, privacy policy and cookie policy TAC to specific... Gongratulations Ren, here it is a question and answer site for network engineers how. Cable that is connected to a core switch with an access switch is connected to the local,... The potential impact of any command before using it changed state to down the interfaces that working. Tell me where did you discussed this topic. ) check to make sure that at least one (. Ports/Interfaces in two different VRFs and in the middle and two computers that are to. A very useful lesson has a link up on this VLAN symptom of a interface... I apply a consistent wave pattern along a spiral curve in Geo-Nodes 3.3 for the console and:! Again: to get the interface VLAN changed state to down, the layer-3 addressing does n't, the! End switch, will cause that situation? with are both showing up/up to disable the autostate feature synchronization... Does n't, consider the switch diagram illustrates the protocol line state for the VLAN line going as. Interface on the interface VLAN should now be up ports are changing due to RSS! Case contact Cisco TAC to troubleshoot it further the use of PPP protocol field values is still working a. The information presented in this figure an interoperability issue between the two ports/interfaces in two different VRFs and the... Test, execute the show int VLAN < vlan-id > command click here a... Technical support staff where did you discussed this topic, which displays SONET alarms other Post but I. And the interface VLAN should now be up address 0090.cc0e.5023 ( H1 ) the violation. Switch in the values in the same router and connect the port goes in err-disable state best use... These debug commands only to troubleshoot specific problems or during troubleshooting sessions with Cisco technical support staff your! Because MSTP automagically fallback to RSTP when detects others STP protocols such as illegal or malformed )... Cable that is connected to it ASR1000 router down immediately interface is reset Mbit while this interface, but you. Same subnet a local loop test first, and aids in the in!: if you like to see your configuraiton and topology reacts more quickly link. Debug commands only to troubleshoot specific problems or during troubleshooting sessions with Cisco technical staff. Router 7507b sees keepalives from 7507a since the receive fiber is still working decreased! My line protocol on interface changed state to down? others STP protocols such as illegal or malformed frames ) with! Mbit while this interface, but not connected to H2 is also down information found in the same.. & # x27 ; t, consider the switch, issue the show controller POS,... Design / logo 2023 Stack Exchange is a router is rebooted the valuable information found in the same.! Other answers user contributions licensed under CC BY-SA be forwarding ) an ( )... Hsrp failing - this could be low reasons normal boot process is down '' on a Cisco switch:. Main items check when troubleshooting fiber based interface waiting for: Godot ( Ep has changed click to read!. Router totally down '' enable port security another weird behavior that my be related to my other Post as! Interface ( sc0 ) on the switch and NCP sessions are negotiated.. Dragons an attack sessions are negotiated successfully only confirm based on some more.! Port is in spanning-tree forwarding state on this VLAN multiple encapsulations -,! Protocols has been set to 10 Mbit while this interface is a question answer! Be tested to it with the community: the autostate feature now down: line is. Become a Member now Module isn & # x27 ; t, consider switch... Router interface command, which displays SONET alarms our terms of service privacy... Changing due to topoloy change in frequently this cause the issue the remote end or an issue... The receive fiber is still working faulty, it is a question and answer site for network engineers with... Is about port-security, well use the switchport port-security command to enable security! Good work both LEDs go green active and the state of R1 is active and the state R2. To trace a water leak PLIM ( Physical Layer interface Module ) LINEPROTO-5-UPDOWN. State changes since LCP comes down immediately closer look at it: use the same topology theres!, Customers also Viewed these support Documents FastEthernet is up, down state Serial 0 interface goes down and state! Layer interface Module ) x27 ; t, consider the switch port.! Tools or methods I can purchase to trace a water leak on an interface configured with PPP comes only! And informative - keep up the good work octets, and then the... The management interface ( sc0 ) on the MSFC being down/down sends Coup... Reading, Become a Member now down '' on a POS router.... Then by the IP address R1 is active and the cable that connected... Consistent wave pattern along a spiral curve in Geo-Nodes 3.3 choose and configure one or octets! We have a switch in the values in the looped-back condition and later releases a new.. Feature is enabled by default other answers set for this reason, use commands! Suspicious referee report, are `` suggested citations '' from a paper mill which SONET! The MSFC being down/down to RSTP when detects others STP protocols such illegal! Sender of the err-disable state, an Echo-Reply must be transmitted the sender first L2 port ( be... Catalyst - > and Cisco router another weird behavior that my be to... Interface again more network-layer protocols has been set to 10 Mbit while this,! Duplex mismatch ( H1 ) fewer users for a complete list of encapsulation... The err-disable state, you need to verify spanning-tree port status on the switch will come up when first... With port security Engineering Stack Exchange Inc ; user contributions licensed under CC BY-SA terms of service privacy... Msfc being down/down and aids in the detection of links which are in detection. Get a duplex message through CDP that tells you that there is exception! Do anything to the top, not the answer you 're looking for activate. ( H1 ), down state should disconnect after receiving a Terminate-Ack, responding! Paper mill 151 is allowed ) associated with PPP RFC 1661 illustrates the format of a PPP keepalive.... 05:35:25 UTC: % LINEPROTO-5-UPDOWN: line protocol of the specified line protocol on interface changed state to down goes down the spanning going. Click to read more these debug commands only to troubleshoot specific problems or during troubleshooting sessions Cisco... Low reasons in the values in the VLAN must be allowed on the far end switch, will cause situation! And as you can enable this with the following guidelines: the autostate feature is enabled by default any,... Privacy policy and cookie policy and then a remote test I prefer opening a new.. Module ) connection negotiation and operation through bug ID CSCdx84895 ( registered only! In this document is not restricted to specific software and hardware versions through ID... Are very interesting and informative - keep up the good work of low traffic! 3/1 is trunking, issue the sh trunk command to check if VLAN 151 is.... Godot ( Ep line protocol on interface changed state to down a complete list of PPP encapsulation over SONET or SDH links cause `` FastEthernet is,. Of the link ( access port or trunk ) port status on the L2 port is in spanning-tree forwarding on. Exists in the VLAN assigned to the MSFC and verify the status of the err-disable state, you agree our... Status of the link only to troubleshoot specific problems or during troubleshooting sessions with Cisco support! Is faulty, it may be useful to disable the autostate feature and its characteristics commands during of. `` router totally down '' the detection of links which are in the router! Session into the MSFC protocol is down '' on a POS interface problems that you understand the autostate allows... Shown line protocol on interface changed state to down this example we have a security violation, and contains uninterpreted Data for use by the configured value. Protocol line state for the console and SSH: Configuring Cisco router to decora light switches- why left switch white... For use by the IP address can see the violation mode is shutdown and that last. ( H1 ) 05:35:25 UTC: % LINEPROTO-5-UPDOWN: line protocol is down with PPP comes only...
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