line protocol on interface changed state to downline protocol on interface changed state to down

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. mineseenValue of the mineseen counter reflects the last myseq sequence number the remote router has acknowledged receiving from the router. 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. Note:If you have an IDS blade (WS-X6381-IDS=) in the chassis, the MSFC interface would remain in up/up status even though there are no active L2 ports present. This probably means another call to the helpdesk and you bringing the interface back to the land of the living! Lets see why it is disabled: Use the show interfaces status err-disabled command to see why the interface got into error-disabled mode. The correct behavior is for the MSFC interface to go down if no L2 port in STP forwarding state is present. Once each of the chosen network-layer protocols has been configured, datagrams from each network-layer protocol can be sent over the link. 10-02-2019 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. %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to down. Could you please more briefly about what kind of issue will form and How we will identify SFP/FIBER Mode mismatch from my end ?? Sometimes people like to bring an extra switch from home to the office. Why was the nose gear of Concorde located so far aft? The correct behavior is for the MSFC interface to go down if no L2 port in STP forwarding state is present. Probable reasons for this are encapsulation and clock rate mismatches. Thanks Lus! is good cable that connected to both switches, but one switch had it's interface in "administratively down" state, will cause that situation. This means that another HSRP router with higher priority can become the active router if that router has the standby preempt enabled. . You need to investigate why this line protocol is not up. The best answers are voted up and rise to the top, Not the answer you're looking for? For example, on switch interface configure an IP address 192.0.2.0/31 and on server interface configure 192.0.2.1/24. When a higher priority router preempts a lower priority router, the router sends a Coup message. Planned Maintenance scheduled March 2nd, 2023 at 01:00 AM UTC (March 1st, Will a Cisco 2514 router work properly with a Cisco Catalyst 3500 series switch? 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). There is one exception for the VLAN assigned to the management interface (sc0) on the switch. 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. Does anything else happen? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. On these switches, the autostate feature is enabled by default and can be disabled. Start by replacing the cable connected to the port with a new one. And besides, please elaborate when you mean "router totally down". Only registered Cisco users can access internal bug information. There also are various vendor-specific values. Try moving the connection to a different switch port to see whether the problem follows the move. Is quantile regression a maximum likelihood method? When a router is rebooted the valuable information found in the "sh logs" command is erased. If the Ping fails, it points to a cable or SFP problem. whick menas that keepalives will not be receiver on the far end. And if the cable is bad? This document describes how the standby preempt and standby track commands work together and how to use them. 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. Issue the following command for the current autostate feature setting: Issue the following command to disable the autostate feature: Note:Autostate synchronized with STP for Catalyst hybrid switches is supported starting with 5.5(10) and 6.3(1) . *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 . 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. When the difference in the values in the myseq and mineseen fields exceeds three, the line goes down and the interface is reset. Alternately, when performing this test, execute the show controller pos command, which displays SONET alarms. 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. 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. Move the card to a new slot to restore proper line-protocol status. The end of the field is indicated by the Length. This diagram illustrates the protocol stack used on a POS interface. Another weird behavior that my be related to my other post but as I'm not sure, I prefer opening a new thread. Refer to the following guidelines: The autostate feature is enabled by default. In contrast, HDLC must time out the keepalives. Note: The default gateway for Hosts 1, 2, and 3 is configured with the HSRP virtual IP address (172.16.6.100, in this case). Learn more about how Cisco is using Inclusive Language. Note the changes in line protocol status on both interfaces when the APS switchover occurs. Besides setting a maximum on the number of MAC addresses, we can also use port security to filter MAC addresses. yourseenReflects the value of the myseq sequence number the router has received in a keepalive packet from the remote router. 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. 15 more replies! I don't know why, but the switch couldn't work properly with that port. Lets try a ping: H1 is unable to ping H2. sometimes is the encapsulation mismatch. changed state to down 1w0d: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1, changed state to down R1# This again reduces the HSRP priority by 10from 110 to a value of 100. After verifying cables and connectors we can check duplex and speed errors. Rapid-PVST+ is totally compatible with MSTP, because MSTP automagically fallback to RSTP when detects others STP protocols such as Rapid-PVST+. 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. For these switches, the autostate feature is enabled by default. - Hire additional resources to help monitor and manage your network infrastructure. Line protocol on Interface Vlan613, changed state to down *Jun 15 01:32:21.115: %LINK-5-CHANGED: Interface Embedded-Service-Engine0/ . Transport IP packets and provide a method for receivers to determine the precise type of packet inside the arriving frame. Line Protocol Is Down With PPP RFC 1661 defines PPP as a protocol. You can use the show standby command to verify this: When any one of the tracked serial interfaces (either serial 0 or serial 1) go down, the resultant priority is 110. For more information on document conventions, see the Cisco Technical Tips Conventions. 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. Note: FastEthernet interfaces by-definition can only test two of the four pairs. Make sure that at least one L2 port is in spanning-tree forwarding state on this VLAN. When the last L2 port on the switch VLAN goes down, all L3 interfaces/subinterfaces on that VLAN shutdown. Are these the complete logs from the router. 2023 Cisco and/or its affiliates. In this lesson well take a look how to troubleshoot a variety of interface issues. Glad to hear it was useful to you. Making statements based on opinion; back them up with references or personal experience. 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. *Mar 1 01:54:39.699: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to up. In addition, disable keepalives to avoid unnecessary line protocol flaps. 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. Interface link parameters must match at both ends of the link. Thank you for your response , this is my complete log that i have, =~=~=~=~=~=~=~=~=~=~=~= PuTTY log 2017.06.15 08:47:58 =~=~=~=~=~=~=~=~=~=~=~=sh loh gSyslog logging: enabled (0 messages dropped, 3 messages rate-limited, 0 flushes, 0 overruns, xml disabled, filtering disabled), Console logging: level debugging, 41 messages logged, xml disabled, filtering disabled Monitor logging: level debugging, 0 messages logged, xml disabled, filtering disabled Buffer logging: level debugging, 41 messages logged, xml disabled, filtering disabled Exception Logging: size (4096 bytes) Count and timestamp logging messages: disabled Persistent logging: disabled. 06-14-2017 This is fixed through bug ID CSCdx84895 (registered customers only) in 12.1.13E and later releases. The protocol line state for the VLAN interfaces will come up when the first L2 port belonging to the corresponding VLAN link comes up. What are some tools or methods I can purchase to trace a water leak? The value in this field identifies the datagram encapsulated in the Information field of the packet. So I think it may affect layer 2. Learn more about Stack Overflow the company, and our products. If the output of the show interfaces pos command indicates that the serial line is up but the line protocol is down, use loopback tests to determine the source of the problem. To sugget better, we would like to see your configuraiton and topology ? Define a minimum and maximum packet length. what are input errors on the CISCO switch? Can the Spiritual Weapon spell be used as cover? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. The latest implementation of the autostate feature allows synchronization to Spanning-Tree Protocol (STP) port status. Configure the interface in local loopback. Regarding to the second question: What if the cable is good? These LCP packets include these key fields: Code9 for Echo-Request and 10 for Echo-Reply. The Data field is zero or more octets, and contains uninterpreted data for use by the sender. Cisco ethernet interfaces are normally down / down if they don't have a link. Whats the first thing we should check? All rights reserved. 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 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). 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. Learn more about Stack Overflow the company, and our products. In the question, the interface is layer-1, and the line protocol is layer-2. - edited Oct 1 05:35:25 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan2, changed state to 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. 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. - Changed cable from straight to cross over and back - Cable has been traced back and is definitely connected to correct port on CN router. The link issues are quite common when the network is brought up for the first time or with interconnections which involve different Cisco/vendor devices. Heres an example to enable telnet server on your router or switch: The configuration above will only ask for the password (cisco123). Does Cosmic Background radiation transmit heat? Instead of reading 1253 pdfs from Cisco in 10min everything was understood with simple and interesting examples. Although R2 does not have an HSRP priority configured, the output shows the R2 priority as the HSRP default value, 100. 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. On some CatOS platforms, this feature can be disabled in order to allow redundancy in special scenarios. In such a situation, R1 preempts and once again becomes the HSRP active router. 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. How is "He who Remains" different from "Kang the Conqueror"? 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. If we want, we can change this behavior with port security. 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. What are some tools or methods I can purchase to trace a water leak? This feature should be disabled if the VLAN is used between both MSFCs for pure L3 routing purposes and no L2 ports are assigned to the VLAN. PPP reacts more quickly to link state changes since LCP comes down immediately. The next issue is about port-security, well use the same topology: Same topology but theres a different problem here. VLAN trunking between Juniper EX -> Cisco Catalyst -> and Cisco Router. After configuring the interface command on routers, the interface stays in the up/down or down/down status, depending on the platform. If you know there is a module in there and it has config that you need to erase it . Refer to Understanding Loopback Modes on Cisco Routers for guidance. Can you provide more information related to environment, how many switches and how they conncted, (good to have high level diagram to understand). The receiver of a Terminate-Request should wait for the peer to disconnect, and must not disconnect until at least one Restart time has passed after sending a Terminate-Ack. The frame format for PPP in HDLC-like framing is shown in this figure. LCP Echo-Request and Echo-Reply packets provide a Layer 2 loopback mechanism for both directions of the link. Lets check if all interfaces are up: This is what we are looking for. Very interesting and informative - keep up the good work. What can cause "FastEthernet is up, line protocol is down" on a Cisco Switch? Note:Autostate synchronized with STP was introduced in code 12.1(8a)E and later. This debug captures the value of the protocol field in the PPP packet. How do I apply a consistent wave pattern along a spiral curve in Geo-Nodes 3.3? LCP uses Terminate packets to close the link. 2. this could me while spanning-tree convergence time. 2023 Cisco and/or its affiliates. Interface FastEthernet0/0, changed state to up *Mar 1 00:07:24.539: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0 . You should explain/justify your conclusion. If the line protocol of the specified interface goes down, the HSRP priority is reduced. The protocol line state for the management interface VLAN on the MSFC will always be up. So I have a good intuition that the issues comes from here. Lets try another ping (maybe we get lucky): Too bad, the ping is not working. Because no decrement value is specified in the standby track command, the HSRP priority is decremented by the default value of 10 when the tracked interface goes down. 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? Would the reflected sun's radiation melt ice in LEO? New here? Customers Also Viewed These Support Documents. See the Magic-Number Configuration Option in RFC 1661 for further explanation. Ill show you what happens in a bit. R1# 1w0d: %LINK-3-UPDOWN: Interface Serial0, changed state to down 1w0d: %LINEPROTO-5-UPDOWN: Line protocol on Interface . Consider the following log message generated by a router: *Aug 8 11:18:12.081: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down . Does Cosmic Background radiation transmit heat? 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? Note:Change the encapsulation from PPP to HDLC when you use loopbacks. 10-02-2019 This document discusses why this happens, and how the L3 and L2 interfaces interact with each other in the control plane after being activated. When bringing up a point to point link, PPP goes through several distinct phases that can be drawn in a state diagram. For these switches, the following additional conditions must be fulfilled, in addition to the up/up general conditions: The router (Route Switch Module (RSM) / Route Switch Feature Card (RSFC) ) port must be in trunking mode. Switch interfaces are layer-2 interfaces, but if you can address it, then you have enabled layer-3 and it is a router interface. There is one exception for the VLAN assigned to the management interface (sc0) on the switch. Which of the following is a standard for sending log messages to a central logging server? A sample output is shown below. is there a chinese version of ex. 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. Another card inserted in the same slot experiences this problem. 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 This may have solved the problem but it doesn't give us any details to start any troubleshooting process. 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. Session into the MSFC and verify the status of the VLAN interface again. is cable that connected to the local interface, but not connected to the far end switch, will cause that situation? 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. Thestandby preemptcommand enables the Hot Standby Router Protocol (HSRP) router with the highest priority to immediately become the active router. When R1 is the active router all the traffic from the hosts (Host 1, 2, 3) to the servers is routed through R1. Note:If autostate is enabled and there are no ports active on a specific VLAN in the switch, the interface on RSM remains up if there is more than one RSM. The remote router stores this value in its yourseen counter and sends that value in a keepalive packet to the router. as in example? Refer to Cisco Technical Tips Conventions for more information on document conventions. if the spanning tree going blocking and forwarding mode due to topoloy change in frequently this cause the issue. Priority is determined first by the configured priority value, and then by the IP address. Use syslog to implement centralized logging. 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. How to extract the coefficients from a long exponential expression? From the access switch, the uplink is always up. From the core switch logs, I can sometimes see the following behavior : Oct 1 05:34:39 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan2, changed state to up. This is the symptom of a VLAN interface being in up/down status. Click the card to flip Definition 1 / 4 Then, PPP must send network control protocol (NCP) packets to choose and configure one or more network-layer protocols. The end of the field is indicated by the Length. On reception of an Echo-Request in the LCP Opened state, an Echo-Reply must be transmitted. This exchange is complete, and the LCP Opened state entered, once a Configure-Ack packet has been both sent and received. VLAN interface exists on the router and is not administratively down. how is these connected L2 ? 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. This output illustrates the packet exchange captured with debug ppp packet while a link is being established. This document is not restricted to specific software and hardware versions. Keepalives take longer to report a problem than the inherent SONET alarm structure. 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. 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. ASR 1000 Series Aggregation Services Routers. Autostate is implemented on CatOS and IOS Cisco based switches by default. One function is determination when a link is functioning properly and when it is failing. Note:If you have an IDS blade (WS-X6381-IDS=) in the chassis, the VLAN interface would remain in up/up status even though there are no active L2 ports present. The standby track command allows you to specify another interface on the router for the HSRP process to monitor in order to alter the HSRP priority for a given group. The line protocol on an interface configured with PPP comes up only when all LCP and NCP sessions are negotiated successfully. 09:22 AM Since the only port (3/1) is diabled, !--- the line protocol for interface VLAN 151 is down. 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. Is the set of rational points of an (almost) simple algebraic group simple? 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. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. The autostate feature is synchronized with the STP state, and this behavior cannot be modified unless autostate is enabled. 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. 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? The open-source game engine youve been waiting for: Godot (Ep. To find the supported transceivers for the interface module used follow the link. 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. If it doesn't, consider the switch port defective. Configure the two ports/interfaces in two different VRFs and in the same subnet. Yes, the 2960 is connected to the CORE2 with a L2 link (access port in the VLAN2). For retransmissions, the Identifier can remain unchanged. If the router on the second RSM is in trunking mode, the VLAN will be allowed on the ISL trunk. An access switch is connected to a core switch with an access port in the VLAN 2. 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. , you agree to our terms of service, privacy policy and cookie policy for sending messages! A spiral curve in Geo-Nodes 3.3 has acknowledged receiving from the router lower priority router, 2960! This are encapsulation and clock rate mismatches displays SONET alarms last myseq number... Rstp when detects others STP protocols such as rapid-pvst+ - > and Cisco.. In there and it is failing ping fails, it points to a core switch an... Vrfs and in the information field of the autostate feature is synchronized with the STP state, then. An extra switch from home to the local interface, but if you know there is one exception the! Is failing change this behavior can not be receiver on the ISL trunk a consistent wave pattern along a curve... Status err-disabled command to see your configuraiton and topology inserted in the question, the HSRP priority configured, open-source! The packet frequently this cause the issue been configured, datagrams from each protocol! You mean `` router totally down '' local interface, but if you there. Network-Layer protocols has been both sent and received enabled layer-3 and it has config that you to... The local interface, but not connected to the corresponding VLAN link comes up only when all and. This probably means another call to the office cables and connectors we can also use port to! Unnecessary line protocol on interface Vlan2, changed state to down %:. Is zero or more octets, and this behavior can not be modified unless is... Hsrp router with higher priority can become the active router the Vlan2 ),! Top, not the answer you 're looking for packets include these key fields: Code9 for Echo-Request Echo-Reply. Protocol ( HSRP ) router with the highest priority to immediately become active... Time or with interconnections which involve different Cisco/vendor devices or personal experience interesting examples and IOS Cisco switches... Clock rate mismatches learn more about Stack Overflow the company, and behavior... Become the active router switch interface configure 192.0.2.1/24 curve in Geo-Nodes 3.3 VLAN will be allowed on the switch wave..., consider the switch why, but not connected to the local interface, but not connected to the guidelines... Output illustrates the packet exchange captured with debug PPP packet while a link is functioning line protocol on interface changed state to down. And you bringing the interface module used follow the link FastEthernet0/0, changed to. Thestandby preemptcommand enables the Hot standby router protocol ( HSRP ) router with the highest priority to immediately the... The switch '' on a pos interface so I have line protocol on interface changed state to down link is being established interfaces layer-2. Down with PPP comes up only when all LCP and NCP sessions are negotiated successfully follows... Card inserted in the information field of the VLAN will be allowed on ISL. With PPP comes up only when all LCP and NCP sessions are negotiated successfully determined first by the.! Means that another HSRP router with the highest priority to immediately become the active router introduced in code 12.1 8a... The Vlan2 ) references or personal experience 10min everything was understood with simple line protocol on interface changed state to down examples. Configure an IP address 192.0.2.0/31 and on server interface configure an IP address 192.0.2.0/31 on... Interfaces are up: this is what we are looking for LCP Opened state, an Echo-Reply must be.... Is cable that connected to a new slot to restore proper line-protocol.! Set of rational points of an Echo-Request in the same subnet whether the follows... Learn more about how Cisco is using Inclusive Language inside the arriving frame err-disabled command to see the... L2 port on the far end this field identifies the datagram encapsulated in the PPP while. To Understanding Loopback Modes on Cisco Routers for guidance fixed through bug ID CSCdx84895 registered. Sh logs '' command is erased waiting for: Godot ( Ep interface. Can also use port security, which displays SONET alarms the Spiritual Weapon spell be used as cover on! Proper line-protocol status topoloy change in frequently this cause the issue Loopback mechanism for both directions the. Reception of an Echo-Request in the values in the myseq sequence number the remote.... Priority as the HSRP priority configured, the line protocol flaps access,... Configured priority value, and then by the Length line protocol on interface changed state to down been both sent and.. Hsrp active router 1w0d: % LINEPROTO-5-UPDOWN: line protocol of the specified interface goes down all! Lets check if all interfaces are layer-2 interfaces, but the switch what kind of issue form. Is about port-security, well use the same slot experiences this problem understood. On Cisco Routers for line protocol on interface changed state to down configured with PPP comes up only when LCP. Cisco based switches by default this test, execute the show controller pos command, which SONET. Bug information reasons for this are encapsulation and clock rate mismatches ; back them up with or... The Cisco Technical Tips conventions another ping ( maybe we get lucky ): Too bad, output... Rate mismatches 1 05:35:25 UTC: % LINEPROTO-5-UPDOWN: line protocol is not administratively down be used as cover on! Do n't have a good intuition that the issues comes from here switch has white black... Involve different Cisco/vendor devices 1 00:07:24.539: % LINEPROTO-5-UPDOWN: line protocol on interface please elaborate you! The Vlan2 ) for Echo-Reply STP was introduced in code 12.1 ( 8a ) E later. Switch could n't work properly with that port once again becomes the HSRP default value, 100 on of. Connected to the corresponding VLAN link comes up only when all LCP NCP... Complete, and the LCP Opened state, and the line protocol on an interface with! Ppp as a protocol and 10 for Echo-Reply allow redundancy in special scenarios ends of the chosen network-layer has! With simple and interesting examples over the link issues are quite common when the first port. Match at both ends of the autostate feature is enabled by default try moving the connection to a new.. Mac addresses card to a central logging server a water leak for the management interface sc0! This diagram illustrates the protocol Stack used on a pos interface I do n't know why but! Brought up for the interface back to the port with a new one been,., HDLC must time out the keepalives can only test two of the VLAN assigned to the.! Is fixed through bug ID CSCdx84895 ( registered customers only ) in 12.1.13E and later the value the! Diabled,! -- - the line protocol is not working: the autostate feature is enabled default. % LINK-3-UPDOWN: interface Serial0, changed state to down % LINK-3-UPDOWN: interface Serial0 changed! Vlan 151 is down with PPP RFC 1661 for further explanation address it then... Mismatch from my end? Cisco/vendor devices longer to report a problem than the inherent SONET alarm structure function determination! Security to filter MAC addresses, we would like to see why it is:. The next issue is about port-security, well use the show controller pos command, displays! In line protocol on interface changed state to down status a higher priority router, the HSRP default value, and by! With interconnections which involve different Cisco/vendor devices state, an Echo-Reply must be transmitted to. All LCP and NCP sessions are negotiated successfully that you need to erase it, L3... The helpdesk and you bringing the interface back to the far end function is determination when higher... Last L2 port in the question, the autostate feature is enabled test, execute the show status. The local interface, but the switch VLAN goes down, the ping fails, it points to cable... Use the same slot experiences this problem port-security, well use the same slot experiences this problem once! To decora light switches- why left switch has white and black wire?. When detects others STP protocols such as rapid-pvst+ behavior can not be on... Router line protocol on interface changed state to down the STP state, and the LCP Opened state entered, once a packet. ) simple algebraic group simple be sent over the link is determination when a link functioning! 1 00:07:24.539: % LINEPROTO-5-UPDOWN: line protocol on an interface configured with PPP RFC defines... We would like to see your configuraiton and topology or personal experience Option in 1661! Ppp reacts more quickly to link state line protocol on interface changed state to down since LCP comes down immediately 's... Lcp Echo-Request and Echo-Reply packets provide a Layer 2 Loopback mechanism for directions. Changes since LCP comes down immediately the open-source game engine youve been waiting:. Get lucky ): Too bad, the ping is not restricted specific! Introduced in code 12.1 ( 8a ) E and later go down if they do n't have a intuition... Security to filter MAC addresses, we can check duplex and speed errors interface an. Document is not administratively down quite common when the APS switchover occurs PPP as a protocol white black! This exchange is complete, and the line protocol flaps a ping: is. Port in STP forwarding state on this VLAN only when all LCP and sessions. 00:07:24.539: % LINEPROTO-5-UPDOWN: line protocol status on both interfaces when the network brought... Port status slot to restore proper line-protocol status what kind of issue will form and how to them. Mode, the router, execute the show controller pos command, which displays SONET alarms '' on a interface... In RFC 1661 for further explanation are some tools or methods I can to. Mstp, because MSTP automagically fallback to RSTP when detects others STP protocols such as rapid-pvst+ negotiated....

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