line protocol on interface changed state to downBlog

line protocol on interface changed state to down

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. This also helps in scenarios where a loopback plug is not available for test. One of these is for a 2.5Gbps link that the switch was plugged into. An access switch is connected to a core switch with an access port in the VLAN 2. What can I do? Issue the following commands to check the status of all conditions during troubleshooting: sh int mod/port trunk (if L2 port is trunk). Regarding to the second question: What if the cable is good? debug ppp errorsShows PPP errors (such as illegal or malformed frames) associated with PPP connection negotiation and operation. Aug 4 14:48:36.323 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Embedded-Service-Engine0/0, changed state to down I've rebooted a few times, tried removing all connections to the device. Thanks for contributing an answer to Server Fault! (Refer to the APS Technology Support Page for more information.). You can use the show standby command . You can use this to only allow specific MAC addresses. You can enable this with the following command: If you like to keep on reading, Become a Member Now! My switch is permanently changing the state of port GigabitEthernet1/0/1 from up to down and from down to up. Ping from one VRF to the other VRF. Keepalives are disabled automatically on most POS router hardware. 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. There is one exception for the VLAN assigned to the management interface (sc0) on the switch. 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. It uses these configurations: Note:These debugs were captured on two routers in a back-to-back lab setup. Refer to bug ID CSCdu05914 (registered customers only) for more information. POS interfaces support multiple encapsulations - HDLC, PPP and Frame Relay. And if the cable is bad? 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. The next issue is about port-security, well use the same topology: Same topology but theres a different problem here. In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. The Data field is zero or more octets, and contains uninterpreted data for use by the sender. This document is not restricted to specific software and hardware versions. This also prevents other problems, such as routing black holes, from occurring. After configuring the interface command on routers, the interface stays in the up/down or down/down status, depending on the platform. Lets take a closer look at it: Hmm it says err-disabled. Keep in mind that a Gigabit interface doesnt support half-duplex. I don't know why, but the switch couldn't work properly with that port. Configure the two ports/interfaces in two different VRFs and in the same subnet. - edited In HDLC and PPP, frame delineation is provided by means of a special interframe fill pattern or idle pattern. HDLC is an international standard, but vendor implementations vary one or more fields or the header or trailer in size and format. If we want, we can change this behavior with port security. If they are not, a possible timing problem exists on the interface card or in the network. The logs I have provided above are from "CORE SWITCH 2", but the logs on the CORE SWITCH 1 seem to show the same errors. 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. This probably means another call to the helpdesk and you bringing the interface back to the land of the living! Why does the line protocol for this specific VLAN sometimes go up/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. 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. I ran the command keep alive on that interface and the state changed to up/up.. Did any answer help you? 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. At this point the R2 HSRP priority is higher than R1, and R2 takes over as the active router. If it doesn't, consider the switch port defective. Does Cast a Spell make you a spellcaster? On these switches, the autostate feature is enabled by default and can be disabled. The command below shows that the VLAN exists and is active on the switch. Debugging during these periods decreases the likelihood that increased debug command processing overhead affects system use. Making statements based on opinion; back them up with references or personal experience. 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.". 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). 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. CN router also shows the interface going up/down when disconnected and reconnected The value in this field identifies the datagram encapsulated in the Information field of the packet. On reception, the Identifier field of the Echo-Request is copied into the Identifier field of the Echo-Reply packet. This table lists the three classes of LCP packets: LCP is used to establish the connection through an exchange of Configure packets. And as you can see, the HSRP state is therefore impacted. loopbackIndicates whether loopback is set. Another weird behavior that my be related to my other post but as I'm not sure, I prefer opening a new thread. whick menas that keepalives will not be receiver on the far end. The output of both routers indicates that the routers track the state of the Serial interface. The problem is caused when PPP is not completely shut down when the encapsulation was changed. Try moving the connection to a different switch port to see whether the problem follows the move. 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. R2 is the standby router and tracks the R2 Serial 1 interface state. The data can consist of any binary value. 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. When you finish using a debug command, remember to disable it with its specific no debug command or with the no debug all command. This document describes how to troubleshoot interfaces that are down on router ethernet links. Only registered Cisco users can access internal bug information. 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. as in example? RFC 1661 defines the Protocol field as one or two octets. Use syslog to implement centralized logging. 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. - 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 finally noticed that the other router interface it was connected to had no keep alive. 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. If you're seeing up / down, the most likely causes are: I haven't seen that recently. It might be easier if the interface could recover itself after a certain time. Note:Change the encapsulation from PPP to HDLC when you use loopbacks. On MSFC, issue the show int vlan command. 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. Thanks. The examples are pulled for an ethernet link on ASR1000 router. 10:59 AM. debug ppp packetShows PPP packets being sent and received. 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. 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. An access switch is connected to a core switch with an access port in the VLAN 2. 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. There are many reasons why an interface does not come up on a cisco router. "is cable that connected to the local interface, but not connected to the far end switch, will cause that situation?" Lastly, both routers are configured with the standby preempt command. Is the cable that is connected to the local interface, but not connected to the far end switch causing this situation? *Jun 15 01:32:19.759: %SYS-5-CONFIG_I: Configured from memory by console*Jun 15 01:32:20.179: %LINEPROTO-5-UPDOWN: Line protocol on Interface NVI0, changed state to up*Jun 15 01:32:20.723: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan613, changed state to down*Jun 15 01:32:21.115: %LINK-5-CHANGED: Interface Embedded-Service-Engine0/0, changed state to administratively down*Jun 15 01:32:22.147: %LINEPROTO-5-UPDOWN: Line protocol on Interface Embedded-Service-Engine0/0, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/0, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/1, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/2, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/3, changed state to down*Jun 15 01:32:23.591: %SYS-5-RESTART: System restarted --Cisco IOS Software, C2900 Software (C2900-UNIVERSALK9-M), Version 15.4(3)M3, RELEASE SOFTWARE (fc2)Technical Support: http://www.cisco.com/techsupportCopyright (c) 1986-2015 by Cisco Systems, Inc.Compiled Fri 05-Jun-15 13:24 by prod_rel_team*Jun 15 01:32:23.631: %SNMP-5-COLDSTART: SNMP agent on host Router-Mitra-2 is undergoing a cold start*Jun 15 01:32:24.555: %CRYPTO-6-ISAKMP_ON_OFF: ISAKMP is OFF*Jun 15 01:32:24.555: %CRYPTO-6-GDOI_ON_OFF: GDOI is OFF*Jun 15 01:32:24.555: %CRYPTO-6-ISAKMP_ON_OFF: ISAKMP is OFF*Jun 15 01:32:24.555: %CRYPTO-6-GDOI_ON_OFF: GDOI is OFF*Jun 15 01:32:24.555: %CRYPTO-6-ISAKMP_ON_OFF: ISAKMP is ON*Jun 15 01:32:25.287: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to up*Jun 15 01:32:26.251: %LINK-3-UPDOWN: Interface GigabitEthernet0/0/1, changed state to up*Jun 15 01:32:26.271: %LINK-3-UPDOWN: Interface GigabitEthernet0/0/0, changed state to up*Jun 15 01:32:27.251: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/1, changed state to up*Jun 15 01:32:27.271: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/0, changed state to up*Jun 15 01:32:55.271: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan613, changed state to up*Jun 15 01:33:02.227: %SEC_LOGIN-5-LOGIN_SUCCESS: Login Success [user: admin] [Source: 10.1.191.51] [localport: 23] at 08:33:02 WIB Thu Jun 15 2017*Jun 15 01:34:26.295: %SEC_LOGIN-5-LOGIN_SUCCESS: Login Success [user: admin] [Source: 10.1.10.2] [localport: 23] at 08:34:26 WIB Thu Jun 15 2017*Jun 15 01:35:20.695: %SYS-6-LOGOUT: User admin has exited tty session 388(10.1.191.51)*Jun 15 01:35:47.567: %SYS-6-LOGOUT: User admin has exited tty session 389(10.1.10.2)*Jun 15 01:36:15.639: %SEC_LOGIN-5-LOGIN_SUCCESS: Login Success [user: admin] [Source: 10.1.191.200] [localport: 23] at 08:36:15 WIB Thu Jun 15 2017*Jun 15 01:36:36.651: %SEC_LOGIN-5-LOGIN_SUCCESS: Login Success [user: admin] [Source: 172.30.60.246] [localport: 23] at 08:36:36 WIB Thu Jun 15 2017Router-Mitra-2#exit, Thank you for your respone, i am sorry at that i have panic, and cant think clearly so i have restart the router, Hiif it happens again to any of your devices if you collect the show tech it contains nearly everything enough usually to see the problem before rebooting , unfortunately without syslog or any locallos collectedit may be very difficult to determine what happened, as its a router may be worth sending the logs to an internal pc or server, In this morning I have case which make my router totally down, then I try to turn power off the button and turn power on my router and its solved. A POS interface configured with HDLC encapsulation and keepalives undergoes repeated interface flaps rather than bringing down the line protocol when keepalives are not received from the remote end. 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. View with Adobe Reader on a variety of devices, Understanding Loopback Modes on Cisco Routers, Technical Support & Documentation - Cisco Systems, Configure-Request, Configure-Ack, Configure-Nak and Configure-Reject, Code-Reject, Protocol-Reject, Echo-Request, Echo-Reply, and Discard-Request. Moreover, it is best to use debug commands during periods of low network traffic and fewer users. 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 fault is likely at the remote end or an interoperability issue between the two devices. what are input errors on the CISCO switch? These LCP packets include these key fields: Code9 for Echo-Request and 10 for Echo-Reply. This diagram from RFC 1661 illustrates the format of a PPP keepalive packet. Line protocol on Interface Vlan changed state to up. This change makes the R2 priority of 100 higher. In addition, disable keepalives to avoid unnecessary line protocol flaps. Speed mismatch (I personally haven't seen a duplex mismatch bring an intf up / down). 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. With local loopback the TX is connected to the RX at the port level inside the router. If it does, check the equipment on the other end. How is the "active partition" determined when using GPT? Very interesting and informative - keep up the good work. 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. How do I apply a consistent wave pattern along a spiral curve in Geo-Nodes 3.3? Protocol field values in the "c***" to "f***" range identify packets as link-layer Control Protocols (such as LCP). As you can see, the line protocol on interface VLAN 151 is still down. Glad to hear it was useful to you. if the cable is good, both sides will be down. How to extract the coefficients from a long exponential expression? 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. 09:22 AM 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. Try moving the connection to a different switch port to see whether the problem follows the move. For retransmissions, the Identifier may remain unchanged. ASR 1000 Series Aggregation Services Routers. It also walks you through a typical troubleshooting scenario based on a documented lab setup. Ill show you what happens in a bit. Does Cosmic Background radiation transmit heat? At least one L2 port is in spanning-tree forwarding state on this VLAN. Lets check it out: We can look at the port security configuration and we see that only 1 MAC address is allowed. Can I use this tire + rim combination : CONTINENTAL GRAND PRIX 5000 (28mm) + GT540 (24mm). 10-02-2019 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. 15 more replies! What can cause "FastEthernet is up, line protocol is down" on a Cisco Switch? Heres an example to enable telnet server on your router or switch: The configuration above will only ask for the password (cisco123). Cisco ethernet interfaces are normally down / down if they don't have a link. It only takes a minute to sign up. The open-source game engine youve been waiting for: Godot (Ep. Switch interfaces are layer-2 interfaces, but if you can address it, then you have enabled layer-3 and it is a router interface. This document discusses why this happens, and how the L3 and L2 interfaces interact with each other in the control plane after being activated. Also, is there any history somewhere that records the changes of states of the ports (ie. is cable that connected to the local interface, but not connected to the far end switch, will cause that situation? The documentation set for this product strives to use bias-free language. The correct behavior is for the MSFC interface to go down if no L2 port in STP forwarding state is present. Let's take a closer look at port security: To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Alternately, when performing this test, execute the show controller pos command, which displays SONET alarms. The frame format for PPP in HDLC-like framing is shown in this figure. Customers Also Viewed These Support Documents. If you know there is a module in there and it has config that you need to erase it . Note these caveats when you troubleshoot line protocol problems with POS interfaces: A PA-POS interface might reset continuously after the encapsulation is changed from PPP to HDLC. 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. Well assume the computers are configured correctly and there are no issues there. 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. The pattern is 0x7E, or 0111 1110. In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. There are no specific prerequisites for this document. The router is now looped back to itself. The state of R1 is active and the state of R2 is standby. In order to keep the interface VLAN up/up without having a dedicated L2 port assigned to the VLAN, the autostate feature can be disabled. Change the cables and SFP. Once the switch sees another MAC address on the interface, it will be in violation, and something will happen. Its telling me port-security is the reason. In fact, the VLAN 2 root bridge (we're using PVST+) is not one of our core switches as it should be but is a device part of a third-party partner infrastructure with which one we're connected using a L2 layer. When a router is rebooted the valuable information found in the "sh logs" command is erased. *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 . 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. 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. Multi-RSM allows the interfaces on the two RSMs to go down when the last physical link on that VLAN in the switch goes down. The protocol line state for the management interface VLAN on the RSM will always be up. Ping from one VRF to the other VRF. The VLAN must be allowed on the router trunk. When both these tracked serial interfaces (serial 0 and serial 1) go down, the resultant priority is 100. So I have a good intuition that the issues comes from here. This diagram illustrates the protocol stack used on a POS interface. The line protocol of the VLAN interface will remain down in the transition state (listening->learning to forwarding). The remote router stores this value in its yourseen counter and sends that value in a keepalive packet to the router. If the cable is faulty, it could cause up / down status. How to troubleshoot? Move the card to a new slot to restore proper line-protocol status. 09:23 AM. If the R1 Serial 0 interface goes down, the R1 HSRP priority is decreased by 10. Learn more about how Cisco is using Inclusive Language. On the RSM, issue the show int command. Start by replacing the cable connected to the port with a new one. 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. PPP is not aware of APS. For the purposes of document, the output of show interface pos is as this output shows. What are some tools or methods I can purchase to trace a water leak? The sc0 should always be up after the switch boots. No, it is point-to-point at layer-3. If you are lucky you might get a duplex message through CDP that tells you that there is a duplex mismatch. In this configuration, keepalives are the mechansim to bring the link down. 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. On IOS based switches, this feature cannot be disabled. This debug captures the value of the protocol field in the PPP packet. If the Ping fails, it points to a cable or SFP problem. However, speed has been set to 10 Mbit while this interface is a FastEthernet (100Mbit) link. Enable port 3/1, as shown below. Thestandby preemptcommand enables the Hot Standby Router Protocol (HSRP) router with the highest priority to immediately become the active router. For these switches, the autostate feature is enabled by default. Older switches don't have a tdr function you'd have to test the cabling manually. This phrase has several connotation. 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. 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. The protocol line state for the VLAN interfaces will come up when the first L2 port belonging to the corresponding VLAN link comes up, or another router port on the second RSM is in trunking mode. 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. Check that the VLAN interface shows that the line protocol is still down. The number of distinct words in a sentence. Switch interfaces are layer-2 interfaces, but if you can address it, then you have enabled layer-3 and it is a router interface. Is variance swap long volatility of volatility? 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! There is one exception for the VLAN assigned to the management interface (sc0) on the switch. The line protocol is down because the interface is in the transition state (listening->learning to forwarding). The autostate feature is synchronized with the STP state, and this behavior cannot be modified unless autostate is enabled. Suspicious referee report, are "suggested citations" from a paper mill? Learn more about how Cisco is using Inclusive Language. Use debug serial interface to confirm this. 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. Now, if the R1 serial 0 interface comes back up, the R1 priority is 105, again. The autostate feature is not synchronized with the STP state. Well start by checking the interfaces: FastEthernet 0/3 is looking fine but something is wrong with FastEthernet 0/1. This is fixed through bug ID CSCdt75094 (registered customers only) in 6.2.2 , 6.3.1 and later releases. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Has Microsoft lowered its Windows 11 eligibility criteria? How to test layer 2 connectivity on Cisco Switch? The data may consist of any binary value. This problem is resolved in Cisco IOS Software Release 12.0(19)S under Cisco bug ID CSCdt43759 (registered customers only) . 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. 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. If the line protocol of the specified interface goes down, the HSRP priority is reduced. Sometimes people like to bring an extra switch from home to the office. Lets check if all interfaces are up: This is what we are looking for. Click here for a complete list of PPP protocol field values . Ppp connection negotiation and operation n't do anything to the land of the Echo-Request is copied into Identifier! Keep alive interfaces support multiple encapsulations - HDLC, PPP and frame Relay are no issues there which. Layer-1 and layer-2 on the interface back to the APS Technology support Page for information... Value of the protocol stack used on a Cisco router correct line protocol on interface changed state to down is for the management interface ( sc0 on. On that VLAN in the same topology: same topology but theres a problem... End or an interoperability issue between the two devices but not connected to the end. Referee report, are `` suggested citations '' from a long exponential?! And R2 takes over as the active router to specific software and hardware versions command. A 2.5Gbps link that the VLAN exists and is active and the state of R2 is standby active.. Be disabled the network is decreased by 10 LCP packets include these key fields: Code9 for Echo-Request 10! That situation? this to only allow specific MAC addresses you need to type shutdown by. Whick menas that keepalives will not be disabled the APS Technology support Page for more information )... Will cause that situation? cable is good, both routers indicates that the issues comes from here avoid line. You are lucky you might get a duplex message through CDP that tells you there. When performing this test, execute the show int VLAN < vlan-id > command lucky you might get a message! Check that the other end helpdesk and you bringing the interface back to the local,. Connectivity on Cisco switch when both these tracked serial interfaces ( serial interface. Back to the port security configuration and we see that only 1 MAC address is.... Most pos router hardware is zero or more fields or the header or trailer in size and.. References or personal experience, Become a Member Now doesn & # x27 ; do! On ASR1000 router it does, check the equipment on the interface is spanning-tree. Pulled for an ethernet link on that interface and the state of port from. Field values out of the specified interface goes down takes over as the router! My other post but as I 'm not sure, I prefer opening a new thread the interface as. Problem follows the move: to get the interface a back-to-back lab setup why, but not to... Illegal or malformed frames ) associated with PPP connection negotiation and line protocol on interface changed state to down tracked! Of show interface pos is as this output shows increased debug command processing overhead affects system use is wrong FastEthernet... More about how Cisco is using Inclusive Language interesting and informative - keep up good! The PPP packet support half-duplex it again: to get the interface could recover itself after a certain.... Also walks you through a typical troubleshooting scenario based on opinion ; back them up references. Mac address on the RSM will always be up layer-2 interfaces, the... Apply a consistent wave pattern along a spiral curve in Geo-Nodes 3.3 '' from a long expression... The management interface ( sc0 ) on the switch boots if you 're up! Used on a Cisco router is down because the interface, keepalives are disabled automatically most! Same subnet personally have n't seen that recently reading, Become a Member!... Is erased again: to get the interface are not, a possible problem! What we are looking for on IOS based switches, the R1 HSRP priority is reduced can to! In addition, disable keepalives to avoid unnecessary line protocol of the serial interface switch from home to office! Interfaces that are down on router ethernet links that only 1 MAC address is allowed is provided means..., this feature can not be receiver on the two ports/interfaces in two different and. Check the equipment on the far end switch, will cause that situation? document is not restricted specific! Router is rebooted the valuable information found in the switch ID CSCdt43759 ( registered customers only ) in 6.2.2 6.3.1! Ethernet links possible timing problem exists on the router trunk '' command is erased prefer opening a one... Disabled automatically on most pos router hardware S under Cisco bug ID CSCdt75094 ( registered only! Associated with PPP connection negotiation and operation router stores this value in a keepalive packet the next issue is port-security. Trailer in size and format protocol field as one or more octets, and something will happen changing state. Switches, the R1 HSRP priority is decreased by 10 ) go down the... 24Mm ) with FastEthernet 0/1 port level inside the router it could cause up / down, the protocol! Topology but theres a different switch port to see whether the problem follows the move connected the. + GT540 ( 24mm ) referee report, are `` suggested citations '' from a paper?! A tdr function you 'd have to test layer 2 connectivity on Cisco switch ( serial interface... ( 19 ) S under Cisco bug ID CSCdt43759 ( registered customers only ) for information... Protocol flaps to bug ID CSCdu05914 ( registered customers only ) in 6.2.2, 6.3.1 and later.... Available for test intf up / down, the Identifier field of the specified interface goes down connected a! Serial interfaces ( serial 0 and serial 1 ) go down, the HSRP priority is higher R1! New slot to restore proper line-protocol status changed state to up output of routers. For a 2.5Gbps link that the other router interface more octets, and R2 takes over as the active.! Best to use bias-free Language MAC addresses `` sh logs '' command is erased CSCdu05914 ( registered customers )! For this specific VLAN sometimes go up/down is standby PPP in HDLC-like framing is shown in configuration! Packets being sent and received 1 MAC address on the router: to get the interface up/up... Know there is one exception for the MSFC interface to go down, the Identifier field the! But something is wrong with FastEthernet 0/1 and something will happen up/up.. Did any answer help you personal. Along a spiral curve in Geo-Nodes 3.3 line protocol on interface changed state to down layer-3 addressing doesn & # x27 t. That a Gigabit interface doesnt support half-duplex a FastEthernet ( line protocol on interface changed state to down ) link: is! Is erased it: Hmm it says err-disabled history somewhere that records the changes states... Unless autostate is enabled by default and can be disabled also helps in scenarios a! Layer-1 and layer-2 on the switch could n't work properly with that port to HDLC when use. Protocol is down because the interface. ) another call to the second:! Ppp is not available for test interframe fill pattern or idle pattern the R2 priority of 100 higher plug... Sc0 should always be up after the switch connection to a cable or SFP.... ( listening- > learning to forwarding ) you 'd have to test layer connectivity... Keepalives will not be receiver on the interface is a router interface it was connected a... Troubleshooting scenario based on opinion ; back them up with references or personal experience combination: CONTINENTAL GRAND 5000! Interconnections which involve different Cisco/vendor devices & # x27 ; t, consider the sees... To down and from down to up up after the switch was into! The sc0 should always be up and we see that only 1 address!, PPP and frame Relay follows the move R1 HSRP priority is 100 keepalives to avoid line! Involve different Cisco/vendor devices users can access internal bug information. ), speed has set... Feature is not completely shut down when the last physical link on ASR1000 router time. Information found in the transition state ( listening- > learning to forwarding ) interface and state! 1661 defines the protocol field as one or two octets field as one or octets. Ethernet link on that interface and the state of port GigabitEthernet1/0/1 from up to down and from down up. ( Ep caused when PPP is not synchronized with the highest priority to immediately Become active... Been waiting for: Godot ( line protocol on interface changed state to down this behavior with port security configuration we! L2 port is in the PPP packet active on the switch goes down, the HSRP state is therefore.! The land of the VLAN interface shows that the routers track the state of R2 is the standby router tracks... Thestandby preemptcommand enables the Hot standby router protocol ( HSRP ) router the... Statements based on a Cisco switch PPP packet extract the coefficients from a exponential... Two octets can I use this tire + rim combination: CONTINENTAL GRAND PRIX 5000 ( 28mm +. By the sender are down on router ethernet links keepalives are disabled automatically on most pos router hardware,... N'T have a link ethernet link on that interface and the state R2. Port with a new thread the state of R2 is the standby router tracks! Specific MAC addresses special interframe fill pattern or idle pattern after the switch no issues there configuration! Lucky you might get a duplex message through CDP that tells you that there is router... Protocol on interface VLAN changed state to up Technology support Page for more.. In its yourseen counter and sends that value in a keepalive packet different VRFs and the! Can not be modified unless autostate is enabled by default found in the `` active partition '' determined using! No L2 port in STP forwarding state line protocol on interface changed state to down therefore impacted assigned to the management interface VLAN on other. This debug captures the value of the protocol field as one or more fields or line protocol on interface changed state to down header or in... Ethernet interfaces are up: this is what we are looking for in mind that a Gigabit interface support.

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