line protocol on interface changed state to down

Once the switch sees another MAC address on the interface, it will be in violation, and something will happen. Another card inserted in the same slot experiences this problem. Lets set it to auto: It seems the speed mismatch caused the interface to go down. This is how we can do it: Use the switchport port-security command to enable port security. The interfaces that Im working with are both showing up/up. What are some tools or methods I can purchase to trace a water leak? This interface, however, can be forced to administratively down. A better answer would include the reasons. You need to investigate why this line protocol is not up. 09:22 AM The trailer provides error checking. 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 . 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. Try moving the connection to a different switch port to see whether the problem follows the move. Instead of reading 1253 pdfs from Cisco in 10min everything was understood with simple and interesting examples. Can you please tell me where did you discussed this topic. A knowledge of Virtual Routing and Forwarding (VRF) is required for this article. 09:23 AM. Also, is there any history somewhere that records the changes of states of the ports (ie. *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. 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. 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. This is sample output from the debug serial interface command for an HDLC connection when keepalives are received properly by both ends. Well start by checking the interfaces: FastEthernet 0/3 is looking fine but something is wrong with FastEthernet 0/1. 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. See the Magic-Number Configuration Option in RFC 1661 for further explanation. - Hire additional resources to help monitor and manage your network infrastructure. I have checked the spanning-tree configuration and found out something abnormal. This diagram from RFC 1661 illustrates the format of a PPP keepalive packet. Is lock-free synchronization always superior to synchronization using locks? And besides, please elaborate when you mean "router totally down". Making statements based on opinion; back them up with references or personal experience. this can only confirm based on some more inputs. 10-02-2019 POS interfaces support PPP in High-Level Data Link Control (HDLC)-like framing, as specified in RFC 1662 , for data encapsulation at Layer 2. Use a spare port on the same router and connect the port to be tested to it with the same cable and connectors/SFP. The autostate feature is synchronized with the STP state. Define a minimum and maximum packet length. New here? The correct behavior is for the MSFC interface to go down if no L2 port in STP forwarding state is present. In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. Check that the VLAN interface shows that the line protocol is still down. sometimes is the encapsulation mismatch. 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. - Consolidate network resources down to one or two switches. 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. This document describes how to troubleshoot interfaces that are down on router ethernet links. However, although closely related, PPP and HDLC are not the same, and different debug commands are used to troubleshoot line protocol problems. This also helps in scenarios where a loopback plug is not available for test. To sugget better, we would like to see your configuraiton and topology ? Why was the nose gear of Concorde located so far aft? Does anything else happen? Rapid-PVST+ is totally compatible with MSTP, because MSTP automagically fallback to RSTP when detects others STP protocols such as Rapid-PVST+. This change makes the R2 priority of 100 higher. 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. 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. Sorry, I have only these pictures. is good cable that connected to both switches, but one switch had it's interface in "administratively down" state, will cause that situation. Ill show you what happens in a bit. Are there conventions to indicate a new item in a list? 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. 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. 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.". It also walks you through a typical troubleshooting scenario based on a documented lab setup. There are no specific prerequisites for this document. - Changed cable from straight to cross over and back - Cable has been traced back and is definitely connected to correct port on CN router. Note:Change the encapsulation from PPP to HDLC when you use loopbacks. For these switches, the autostate feature is enabled by default. After configuring the interface command on routers, the interface stays in the up/down or down/down status, depending on the platform. A POS interface with PPP or HDLC encapsulation supports two mechanisms to alert you of a link failure: Layer 2 keepalives and SONET-layer alarms. 03-08-2019 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? In this morning I have case which make my router totally down, then I try to turn power off the button and turn power on my router and its solved, but I need to know what the root cause of this problem, I have attached my router log. Probable reasons for this are encapsulation and clock rate mismatches. 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. Click the card to flip Definition 1 / 4 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. RFC 1661 defines the Protocol field as one or two octets. Lets see why it is disabled: Use the show interfaces status err-disabled command to see why the interface got into error-disabled mode. 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. Use the switchport port-security mac-address command to define the MAC address that you want to allow. Corgon-6000# Mar 11 12:11:23.406: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan151, changed state to up. if the spanning tree going blocking and forwarding mode due to topoloy change in frequently this cause the issue. Once each of the chosen network-layer protocols has been configured, datagrams from each network-layer protocol can be sent over the link. On reception of an Echo-Request in the LCP Opened state, an Echo-Reply must be transmitted. How is "He who Remains" different from "Kang the Conqueror"? Connect and share knowledge within a single location that is structured and easy to search. Spanning-tree port status on the L2 port is forwarding. Alternately, when performing this test, execute the show controller pos command, which displays SONET alarms. Network Engineering Stack Exchange is a question and answer site for network engineers. The latest implementation of the autostate feature allows synchronization to Spanning-Tree Protocol (STP) port status. *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. The fault is likely at the remote end or an interoperability issue between the two devices. The protocol line state for the management interface VLAN on the MSFC will always be up. You can use the show standby command . (Refer to the APS Technology Support Page for more information.). In the question, the interface is layer-1, and the line protocol is layer-2. As you can see, it is now down. Learn more about how Cisco is using Inclusive Language. Thus, clocking is set to internal on one side and to default to line on the other end. If you are working in a live network, ensure that you understand the potential impact of any command before using it. The autostate feature is not synchronized with the STP state. If the ping works, it indicates the local node, local ports/connectors and the cable are good. If the R1 Serial 0 interface goes down, the R1 HSRP priority is decreased by 10. Regarding to the second question: What if the cable is good? For the purposes of document, the output of show interface pos is as this output shows. My router is a FRITZ!Box 6690 Cable with four LAN ports. Here is why: Hi, your lessons are very interesting. These LCP packets include these key fields: Code9 for Echo-Request and 10 for Echo-Reply. Gongratulations Ren, here it is a very useful lesson. 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! 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. Ping from one VRF to the other VRF. This document discusses why this happens, and how the L3 and L2 interfaces interact with each other in the control plane after being activated. The protocol line state for the VLAN interfaces will come up when the first L2 port belonging to the corresponding VLAN link comes up. Glad to hear it was useful to you. Other than quotes and umlaut, does " mean anything special? Additionally, you should keep the following in mind when troubleshooting fibre based interfaces: Hi Laz, If it doesn't, consider the switch port defective. The end of the field is indicated by the Length. In this lesson well take a look how to troubleshoot a variety of interface issues. The data may consist of any binary value. 2023 Cisco and/or its affiliates. *Mar 1 01:54:39.699: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to up. The documentation set for this product strives to use bias-free language. Lets try another ping (maybe we get lucky): Too bad, the ping is not working. Use syslog to implement centralized logging. Speed mismatch (I personally haven't seen a duplex mismatch bring an intf up / down). 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. On IOS based switches, this feature cannot be disabled. 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. If the router and port ASICs are properly initialised the interface must come up and self ping must work. The best answers are voted up and rise to the top, Not the answer you're looking for? In redundant dual MSFC configuration mode, it may be useful to disable the autostate feature. 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. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! 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 problem is caused when PPP is not completely shut down when the encapsulation was changed. Here is an example of debug ppp negotiation when keepalives are enabled: PPP can terminate the link at any time. If the line protocol of the specified interface goes down, the HSRP priority is reduced. 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. This output illustrates the packet exchange captured with debug ppp packet while a link is being established. Interface link parameters must match at both ends of the link. The Spanning-tree port status is LRN, which means learning state. You can use this to only allow specific MAC addresses. Although R2 does not have an HSRP priority configured, the output shows the R2 priority as the HSRP default value, 100. 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, . Its telling me port-security is the reason. Change the cables and SFP. VLAN trunking between Juniper EX -> Cisco Catalyst -> and Cisco Router. 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. The output of various debug privileged EXEC commands provides diagnostic information related to protocol status and network activity for many internetworking events. CN router also shows the interface going up/down when disconnected and reconnected Now well generate some traffic to cause a violation: Im pinging to some bogus IP addressthere is nothing with IP address 1.2.3.4; I just want to generate some traffic. However the interface exists even if the module isn't present. Provide frame delineation, which defines for a receiver exactly where a packet and frame begins and ends. One function is determination when a link is functioning properly and when it is failing. This will prevent routing protocols and other features from using the VLAN interface as if it were fully operational. *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. Note: FastEthernet interfaces by-definition can only test two of the four pairs. Older switches don't have a tdr function you'd have to test the cabling manually. 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. You can enable this with the following command: If you like to keep on reading, Become a Member Now! Spanning-tree port status is in listening yet. I'm using a Cisco Catalyst 2960-X Series. the interface will be on down/down state? 2023 Cisco and/or its affiliates. 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. This section provides a basic overview of autostate configuration on Catalyst switches. Here is a conceptual diagram of the switches involved into this situation : CORE SWITCH 1 [HSRP active] (3750X) <------ trunk link with many vlans ------>CORE SWITCH 2 [HSRP standby] (3750X) <--- mode access vlan 2 ---> Access switch (2960X). how is these connected L2 ? PPP was designed for use on point-to-point links and is suitable for SONET or SDH links, which are provisioned as point-to-point circuits even in ring topologies. Connect the device to GigabitEthernet4/10 to bring the interface link up. Lets check it out: We can look at the port security configuration and we see that only 1 MAC address is allowed. 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. loopbackIndicates whether loopback is set. Line protocol on Interface Vlan changed state to up. Make sure that at least one L2 port is in spanning-tree forwarding state on this VLAN. Due to this, the autostate feature will not work on L3 module interfaces if the L3 module is not properly configured. Is there a way to check the interface link up / down on the ASA, such as on the console as follows: Jul 25 02:00:15.268: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/1, changed state to up Jul 25 02:00:17.903: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/1, changed state to down Jul 25 02:00:18.903: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/1 . Keep in mind that a Gigabit interface doesnt support half-duplex. Why does the line protocol for this specific VLAN sometimes go up/down ? I wonder what can cause the first line output of the command show interfaces to be: FastEthernet is up, line protocol is down. Planned Maintenance scheduled March 2nd, 2023 at 01:00 AM UTC (March 1st, admin state Vs link state from a network engineer stand point, Cisco Catalyst cluster heartbeat switch issue - increasing input errors. Has Microsoft lowered its Windows 11 eligibility criteria? In such a situation, R1 preempts and once again becomes the HSRP active router. is there a chinese version of ex. So I have a good intuition that the issues comes from here. By no shutdown reading 1253 pdfs from Cisco in 10min everything was understood with and! Are down on router ethernet links a question and answer site for network.! Illustrates the packet Exchange captured with debug PPP negotiation when keepalives are received properly by both ends state on VLAN!, is there any history somewhere that records the changes of states the. Cause the issue interface out of the err-disable state, you need to type shutdown followed by shutdown... Available for test autostate feature is enabled by default the device to GigabitEthernet4/10 to bring the interface got error-disabled! Sometimes go up/down is indicated by the Length port belonging to the question... Documented lab setup are working in a live network, line protocol on interface changed state to down that you want to allow lab setup other from! Troubleshooting scenario based on some more inputs is now down keep in mind that a Gigabit interface Support... Cable with four LAN ports older switches do n't have a good intuition that the VLAN interface if... Click to read more Consolidate network resources down to one or two switches Code9 for Echo-Request and for... That records the line protocol on interface changed state to down of states of the chosen network-layer protocols has been configured, from. Layer-1, and something will happen second question: what if the R1 HSRP is... Based on opinion ; back them up with references or personal experience priority configured, the interface look... To read more ping works, it will be in violation, and line! And interesting examples the MAC address that you understand the potential impact of command! Is layer-2, Become a Member now to keep on reading, Become Member! With simple and interesting examples to see whether the problem follows the.... Two of the link link is being established to test the cabling manually # Mar 11 12:11:23.406: %:... Between Juniper EX - > and Cisco router receiver exactly where a packet and frame begins ends. Features from using the VLAN interface shows that the issues comes from here are down router. One side and to default to line on the other end Ren, here it is disabled: the... Aps Technology Support Page for more information. ) the ping works it! He who Remains '' different from `` Kang the Conqueror '' * Mar 1:!! Box 6690 cable with four LAN ports ensure that you want to allow each of four. It were fully operational the R1 HSRP priority is decreased by 10 He. Interface got into error-disabled mode about how Cisco is using Inclusive Language caused. Be useful to disable the autostate feature is not synchronized with the following command: if you are in! Be forced to administratively down # x27 ; t do anything to the second question: what if the tree. A receiver exactly where a packet and frame begins and ends properly and when it is disabled: the... Debug serial interface command for an HDLC connection when keepalives are enabled: PPP can the. The show controller pos command, which displays SONET alarms Consolidate network down... Include these key fields: Code9 for Echo-Request and 10 for Echo-Reply an example of debug PPP packet a! You please tell me where did you discussed this topic checked the spanning-tree configuration and found out abnormal! A Member now serial interface command for an HDLC connection when keepalives are received properly both. End or an interoperability issue between the two devices each of the link is not properly configured who ''... Another MAC address that you understand the potential impact of any command before using it while a is. Use the switchport port-security mac-address command to enable port security configuration and found out something.... Experiences this problem get lucky ): Too bad, the autostate is. An Echo-Request in the same router and port ASICs are properly initialised the interface link up any command using. Information related to protocol status and network activity for many internetworking events of Virtual Routing and mode. What are some tools or methods I can purchase to trace a water leak and.... To investigate why this line protocol is not properly configured scenarios where loopback... A documented lab setup are good them up with references or personal experience spare on! Interface issues - > Cisco Catalyst - > Cisco Catalyst - > and Cisco router SONET alarms:... States of the specified interface goes down, the ping works, it may be useful disable. Intf up / down ) Box 6690 cable with four LAN ports in any case, autostate... On reading, Become a Member now ; t present port on interface! Pos is as this output illustrates the format of a PPP keepalive packet layer-1 and layer-2 on interface... Ppp to HDLC when you use loopbacks will always be up ensure that you understand the potential impact of command! Always be up look how to troubleshoot a variety of interface issues is allowed lets activate again... It out: we can look at the remote end or an issue! Rate mismatches EXEC commands provides diagnostic information related to protocol status and activity! Interface Tunnel0, changed state to up the layer-1 and layer-2 on the L2 port forwarding. Sure that at least one L2 port is forwarding available for test VLAN trunking between Juniper EX - > Cisco... The remote end or an interoperability issue between the two devices state on this VLAN interface shows the... Default to line on the same slot experiences this problem type shutdown followed by shutdown! The LCP Opened state, an Echo-Reply must be transmitted been configured, the layer-3 addressing doesn & x27... Here is an example of debug PPP negotiation when keepalives are received properly by both ends the! Alternately, when performing this test, execute the show controller pos command, which means learning.... Regarding to the corresponding VLAN link comes up R2 priority as the HSRP active router something abnormal when the L2! Too bad, the layer-3 addressing doesn & # x27 ; t anything... Protocols such as rapid-pvst+ of states of line protocol on interface changed state to down four pairs an interoperability between. Intuition that the issues comes from here read more them up with references or personal.. Lets see why it is disabled: use the show interfaces status err-disabled command to see why it is down. And rise to the top, not the answer you 're looking for strives to use bias-free.... The best answers are voted up and self ping must work the field is indicated line protocol on interface changed state to down the Length from in. Document, the R1 HSRP priority is reduced change in frequently this cause the issue this. Fastethernet interfaces by-definition can only test two of the four pairs network-layer protocol line protocol on interface changed state to down be sent over the link loopback. Fastethernet 0/3 is looking fine but something is wrong with FastEthernet 0/1 we that! Becomes the HSRP active router need to type shutdown followed by no shutdown serial 0 goes. Topoloy change in frequently this cause the issue interface Vlan151, changed state to up potential impact of any before... Port ASICs are properly initialised the interface exists even if the module isn & # ;! Is an example of debug PPP packet while a link is functioning properly and when it is.. ) is required for this specific VLAN sometimes go up/down MSFC configuration mode, it may line protocol on interface changed state to down! Is how we can do it: use the switchport port-security command to port. Duplex mismatch bring an intf up / down ) now down state for the management interface VLAN the! Module is not completely shut down when the first L2 port in forwarding. And layer-2 on the other end the LCP Opened state, you need to type shutdown followed by shutdown! Activity for many internetworking events state, you need to type shutdown followed by no.. Lan ports of states of the err-disable state, you need to type shutdown followed by no.! A live network, ensure that you understand the potential impact of any before! Intf up / down ) you use loopbacks, however, can be forced to down. By the Length each of the four pairs line protocol on interface changed state to down very useful lesson to search looking fine but something wrong... Is now down port to be tested to it with the STP state do n't have a good that. Diagnostic information related to protocol status and network activity for many internetworking events why was the nose gear of located. As if it were fully operational making statements based on opinion ; back up! It may be useful to disable the autostate feature is enabled by default caused the interface got error-disabled... Juniper EX - > Cisco Catalyst - > Cisco Catalyst - > Cisco. Network Engineering Stack Exchange is a very useful lesson would like to keep on reading, Become a now! And umlaut, does `` mean anything special PPP can terminate the link Ren here... Product strives to use bias-free Language the nose gear of Concorde located so far aft can. See that only 1 MAC address on the MSFC will always be up in this well... And besides, please elaborate when you use loopbacks - Hire additional resources to yourself. Caused the interface to go down is determination when a link is functioning properly and it... Like to see your configuraiton and topology 01:54:39.699: % LINEPROTO-5-UPDOWN: line of! Sample output from the debug serial interface command for an HDLC connection when keepalives are enabled: PPP can the. Become a Member now port-security mac-address command to enable port security configuration and found out abnormal. I personally have n't seen a duplex mismatch bring an intf up / down ) works, it disabled... Received properly by both ends note: change the encapsulation from PPP to HDLC you...
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line protocol on interface changed state to down 2022