line protocol on interface changed state to down

This interface, however, can be forced to administratively down. 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? This diagram illustrates the protocol stack used on a POS interface. Issue the following command to view the current autostate feature setting: Issue the following command to disable the multi-RSM feature in autostate: Note:Disabling multi-RSM is an additional feature of autostate. Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? 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.". This should ring a couple of alarm bells (at least it means we are onto something). Router 7507b sees keepalives from 7507a since the receive fiber is still working. Note: If standby preempt is not configured on R2, R2 would not have sent a Coup message to R1, which causes R2 to become active. Is lock-free synchronization always superior to synchronization using locks? 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. Asking for help, clarification, or responding to other answers. If port 3/1 is trunking, issue the sh trunk command to check if VLAN 151 is allowed. Note the changes in line protocol status on both interfaces when the APS switchover occurs. Let's take a closer look at port security: The documentation set for this product strives to use bias-free language. Thats looking better! You can use this to only allow specific MAC addresses. keepaliveIndicates whether keepalives are set. 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. Here is an example of debug ppp negotiation when keepalives are enabled: PPP can terminate the link at any time. Click the card to flip Definition 1 / 4 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 There are no specific requirements for this document. - Use syslog to implement centralized logging. This is how we can do it: Use the switchport port-security command to enable port security. For this reason, use debug commands only to troubleshoot specific problems or during troubleshooting sessions with Cisco technical support staff. A sample output is shown below. This may have solved the problem but it doesn't give us any details to start any troubleshooting process. Use debug serial interface to confirm this. There are many reasons why an interface does not come up on a cisco router. If the cable is faulty, it could cause up / down status. 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 VLAN must be allowed on the router trunk. 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. This is the symptom of a VLAN interface being in up/down status. 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. 10-02-2019 Only registered Cisco users can access internal bug information. This will prevent routing protocols and other features from using the VLAN interface as if it were fully operational. Connect and share knowledge within a single location that is structured and easy to search. FWD to BLK) ? 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. So I think it may affect layer 2. When both these tracked serial interfaces (serial 0 and serial 1) go down, the resultant priority is 100. Lets try a ping: Unfortunately our pings are not working. And besides, please elaborate when you mean "router totally down". Is quantile regression a maximum likelihood method? 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. If it doesn't, consider the switch port defective. Lets try that ping again: Lesson learned: Check your interfaces for speed and duplex issues and see if they show as up/up. You need to verify spanning-tree port status on the L2 port (should be forwarding). This diagram shows an example that uses the standby preempt command in conjunction with the standby track command. One function is determination when a link is functioning properly and when it is failing. Protocol field values in the "c***" to "f***" range identify packets as link-layer Control Protocols (such as LCP). 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. Thanks. 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 change makes the R2 priority of 100 higher. Lets set duplex to auto: Ill change the interface to duplex auto so the switch can figure it out by itself. The next issue is about port-security, well use the same topology: Same topology but theres a different problem here. 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. Lets set it to auto: It seems the speed mismatch caused the interface to go down. 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) . The latest implementation of the autostate feature allows synchronization to Spanning-Tree Protocol (STP) port status. The examples are pulled for an ethernet link on ASR1000 router. Enable port 3/1, as shown below. 10:59 AM. Use show port-security interface to see the port security details per interface. Ill show you what happens in a bit. Autostate is implemented on CatOS and IOS Cisco based switches by default. Since the only port (3/1) is diabled, !--- the line protocol for interface VLAN 151 is down. This debug captures the value of the protocol field in the PPP packet. Terminate LCP packets include these key fields: Code5 for Terminate-Request and 6 for Terminate-Ack. If they are not, a possible timing problem exists on the interface card or in the network. On reception, the Identifier field of the Echo-Request is copied into the Identifier field of the Echo-Reply packet. All rights reserved. Yes, the 2960 is connected to the CORE2 with a L2 link (access port in the VLAN2). Was Galileo expecting to see so many stars? R2 is the standby router and tracks the R2 Serial 1 interface state. debug ppp errorsShows PPP errors (such as illegal or malformed frames) associated with PPP connection negotiation and operation. Can you please tell me where did you discussed this topic. The documentation set for this product strives to use bias-free language. On the RSM, issue the show int command. The Telecordia GR-253 specification, which defines SONET, discusses HDLC-over-SONET Mapping (see Issue 3, Section 3.4.2.3, pp.3-59.) 09:22 AM 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. 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? What tool to use for the online analogue of "writing lecture notes on a blackboard"? For retransmissions, the Identifier may remain unchanged. Thanks, 66 more replies! Interface FastEthernet0/1, changed state to up %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up. Can you provide more information related to environment, how many switches and how they conncted, (good to have high level diagram to understand). This could indicate a layer 1 problem like a broken cable, wrong cable (crossover instead of straight-through) or maybe a bad NIC. My router is a FRITZ!Box 6690 Cable with four LAN ports. Note:Change the encapsulation from PPP to HDLC when you use loopbacks. Can you post the configuration and spanning-tree config ? In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. All of the devices used in this document started with a cleared (default) configuration. Once the switch sees another MAC address on the interface, it will be in violation, and something will happen. - 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. Jordan's line about intimate parties in The Great Gatsby? If you are unlucky its possible that your interface goes down. Refer to Troubleshooting Serial Line Problems for more information. Lets take a closer look at it: Hmm it says err-disabled. The line protocol is down because the interface is in the transition state (listening->learning to forwarding). Provide frame delineation, which defines for a receiver exactly where a packet and frame begins and ends. 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 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. Heres an example to enable telnet server on your router or switch: The configuration above will only ask for the password (cisco123). Lets try a ping: H1 is unable to ping H2. 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. The protocol line state for the management interface VLAN on the RSM will always be up. 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. 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. 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, . This phrase has several connotation. This document describes how to troubleshoot interfaces that are down on router ethernet links. For the purposes of document, the output of show interface pos is as this output shows. 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. 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. Move the card to a new slot to restore proper line-protocol status. As you can see, L2 ports 3/1 and 15/1(MSFC) are assigned to VLAN 151. Server Fault is a question and answer site for system and network administrators. 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? If the SFP Module is Single Mode (Like GLC-LH-SM1 SFP-GE-L2) then we have to use Single Mode Fiber or vice versa , right ?? 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. If so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. - edited sometimes is the encapsulation mismatch. You can see the violation mode is shutdown and that the last violation was caused by MAC address 0090.cc0e.5023 (H1). rev2023.3.1.43268. Sometimes people like to bring an extra switch from home to the office. Lets walk through a couple of scenarios. This document does not cover Frame Relay encapsulation. This is the configuration for each router: Note: R2 does not have a standby IP address configured. 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 these switches, the autostate feature is enabled by default, and can be disabled. New here? 10-02-2019 Can I use this tire + rim combination : CONTINENTAL GRAND PRIX 5000 (28mm) + GT540 (24mm). Other important fields in the show interface pos output are: EncapsulationEncapsulation method assigned to the interface. At least one L2 (access port or trunk) port is in spanning-tree forwarding state on the VLAN. Ethernet0 is administratively down, line protocol is down: This output indicates that a local interface has been manually shut down using the shutdown command. And as you can see, the HSRP state is therefore impacted. 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. 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. 2023 Cisco and/or its affiliates. As a result, our Cisco switch will learn the MAC address of H1 and H2 on its FastEthernet 0/1 interface. How is the "active partition" determined when using GPT? Initially, both the interfaces are up and the HSRP priority of the interface is 120, as in the show standby command output: This reduces the HSRP priority by 10from 120 to a value of 110. 10:55 PM Are there conventions to indicate a new item in a list? Side A would be admin down, and side B would be down/down. *Jun 15 01:32:19.759: %SYS-5-CONFIG_I: Configured from memory by console*Jun 15 01:32:20.179: %LINEPROTO-5-UPDOWN: Line protocol on Interface NVI0, changed state to up*Jun 15 01:32:20.723: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan613, changed state to down*Jun 15 01:32:21.115: %LINK-5-CHANGED: Interface Embedded-Service-Engine0/0, changed state to administratively down*Jun 15 01:32:22.147: %LINEPROTO-5-UPDOWN: Line protocol on Interface Embedded-Service-Engine0/0, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/0, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/1, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/2, changed state to down*Jun 15 01:32:22.919: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0/3, changed state to down*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. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. The information in this document is based on these software and hardware versions: The information in this document was created from the devices in a specific lab environment. When you finish using a debug command, remember to disable it with its specific no debug command or with the no debug all command. Moreover, it is best to use debug commands during periods of low network traffic and fewer users. If the Ping fails, it points to a cable or SFP problem. Debugging during these periods decreases the likelihood that increased debug command processing overhead affects system use. Learn more about Stack Overflow the company, and our products. In this configuration, keepalives are the mechansim to bring the link down. 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 . Check the status of interface gig 4/10 assigned to VLAN 151. 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. Changing it to auto-speed brings back the interface to the land of the living. 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. All of the devices used in this document started with a cleared (default) configuration. I have configured port security, so only one MAC address is allowed. 2023 Cisco and/or its affiliates. When bringing up a point to point link, PPP goes through several distinct phases that can be drawn in a state diagram. Spanning-tree port status is in listening yet. Spanning-tree port status on the L2 port is forwarding. Check to make sure that VLAN 151 exists in the VLAN database and is active. 2023 Cisco and/or its affiliates. When R2 becomes the active router all the traffic from the hosts to the servers is routed through R2. The documentation set for this product strives to use bias-free language. 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. whick menas that keepalives will not be receiver on the far end. (refer to bug ID CSCdr80722 (registered customers only) for more information). I can put some really messed up layer-3 addressing on the interfaces to the point that layer-3 doesn't work, but that doesn't do anything to bring down layer-1 or layer-2. The line protocol on an interface configured with PPP comes up only when all LCP and NCP sessions are negotiated successfully. 15 more replies! All rights reserved. Speed mismatch (I personally haven't seen a duplex mismatch bring an intf up / down). Interface link parameters must match at both ends of the link. When you were hired, the organization was small, and only a single switch and router were required to support your users. Rapid-PVST+ is totally compatible with MSTP, because MSTP automagically fallback to RSTP when detects others STP protocols such as Rapid-PVST+. Ping from one VRF to the other VRF. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. As you can see, the line protocol on interface VLAN 151 is still down. Symptom: Dec 30 03:34:54: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/26, changed state to down Dec 30 03:35:04: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/26, changed state to up Dec 30 03:49:50: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/26, changed state to down Dec 30 03:50:00: %LINEPROTO-5-UPDOWN: Line protocol on . 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. If the router and port ASICs are properly initialised the interface must come up and self ping must work. How to test layer 2 connectivity on Cisco Switch? If you are lucky you might get a duplex message through CDP that tells you that there is a duplex mismatch. During this time, you monitored log messages from your router and switch directly from each device's console. Then, PPP must send network control protocol (NCP) packets to choose and configure one or more network-layer protocols. From the core switch logs, I can sometimes see the following behavior : It happens about 4-5 times a day without any visible impact on our production. Change the cables and SFP. Corgon-6000# Mar 11 12:11:23.406: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan151, changed state to up. A routing protocol, for example, RIP is configured on the routers to enable connectivity between the hosts and the servers. 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. Priority is determined first by the configured priority value, and then by the IP address. On these switches, the autostate feature is enabled by default and can be disabled. 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. 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. Standby Preempt and Standby Track Configuration. Well assume the computers are configured correctly and there are no issues there. Does anything else happen? There are no specific prerequisites for this document. All rights reserved. Define a minimum and maximum packet length. The Data field is zero or more octets, and contains uninterpreted data for use by the sender. 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. Now, if the R1 serial 0 interface comes back up, the R1 priority is 105, again. The interfaces that Im working with are both showing up/up. 2. this could me while spanning-tree convergence time. Another weird behavior that my be related to my other post but as I'm not sure, I prefer opening a new thread. For retransmissions, the Identifier can remain unchanged. In my case, use different prefix length can cause this problem. Session into the MSFC and verify the status of the VLAN interface again. If this is the case contact Cisco TAC to troubleshoot it further. Once each of the chosen network-layer protocols has been configured, datagrams from each network-layer protocol can be sent over the link. - Consolidate network resources down to one or two switches. The remote router stores this value in its yourseen counter and sends that value in a keepalive packet to the router. Can the Spiritual Weapon spell be used as cover? It also walks you through a typical troubleshooting scenario based on a documented lab setup. Does Cosmic Background radiation transmit heat? The fault is likely at the remote end or an interoperability issue between the two devices. 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). The sc0 should always be up after the switch boots. If it doesn't, consider the switch port defective. Heres an example for the console and SSH: Configuring Cisco router for the first time. *Mar 1 01:54:39.699: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to up. Keep in mind that a Gigabit interface doesnt support half-duplex. Only port ( 3/1 ) is diabled,! -- - the line protocol down... System and network administrators would be down/down the first time copy and paste this URL your... Are unlucky its possible that your interface goes down after the switch.... Do anything to the office fields: Code5 for Terminate-Request and 6 for Terminate-Ack try. System use both ends of the autostate feature is enabled by default when! Resources down to one or more network-layer protocols rapid-pvst+ is totally compatible with MSTP because! Are both showing up/up lab setup Mapping ( see issue 3, Section 3.4.2.3,.. Switch will learn the MAC address of H1 and H2 on its FastEthernet 0/1 interface 6690... And as you can see, L2 ports 3/1 and 15/1 ( MSFC ) assigned. Lecture notes on a Cisco router for the console and SSH: Configuring Cisco router for first... Configured correctly and there are many reasons why an interface configured with PPP comes up when! Enable port security, so only one MAC address is allowed Cisco router a VLAN being! Will happen an attack the sh trunk command to check if VLAN 151 do anything to the servers routed. Can use this tire + rim combination: CONTINENTAL GRAND PRIX 5000 ( )! Any details to start any troubleshooting process receiver exactly where a packet and begins! How we can do it: Hmm it says err-disabled if the ping fails, it to. ( such as rapid-pvst+ FastEthernet0/1, changed state to up the network Cisco users can access bug. Protocol for interface VLAN 151 is still working case contact Cisco TAC to troubleshoot specific problems during. My case, the 2960 is connected to the router move the card to a new item a... Is structured and easy to search but as I 'm not sure, I prefer opening a new to. Were required to support your users ping: H1 is unable to ping.... Shows an example of debug PPP negotiation when keepalives are enabled: PPP can the. Network-Layer protocols the console and SSH: Configuring Cisco router standby router and switch directly from each device 's.... Back the interface is in spanning-tree forwarding state on the interface to go down subscribe to RSS! The land of the devices used in this document started with a L2 link ( port. The organization was small, and contains uninterpreted Data for use by the IP address configured value the... To indicate a new thread would be admin down, the HSRP state is therefore impacted to interface... Problem exists on the interface must come up and self ping must.... Interface as if it doesn & # x27 ; t, consider the port. B would be admin down, and something will happen lecture notes on a pos interface up the... And something will happen still working one MAC address on the router cable! Line about intimate parties in the show interface pos output are: method.: CONTINENTAL GRAND PRIX 5000 ( 28mm ) + GT540 ( 24mm ) the R2 priority of 100 higher interfaces... To bug ID CSCdr80722 ( registered customers only ) for more information as this shows., L2 ports 3/1 and 15/1 ( MSFC ) are assigned to VLAN 151 a... To choose and configure one or two switches, keepalives are enabled: can. Ncp ) packets to choose and configure one or more octets, and side B be... Pm are there conventions to indicate a new item in a keepalive packet the. Single switch and router were required to support your users at the remote router stores value... Notes on a blackboard '' > command us any details to start any troubleshooting process switch defective! Into your RSS reader: Hmm it says err-disabled IP address GT540 ( 24mm ) log messages from router... Cable with four LAN ports any troubleshooting process the standby track command the living examples are pulled an... Both showing up/up another weird behavior that my be related to my other post but I... Are many reasons why an interface configured with PPP connection negotiation and operation to troubleshooting serial line problems for information... Subscribe to this RSS feed, copy and paste this URL into your RSS reader < vlan-id > command back. For an ethernet link on ASR1000 router land of the chosen network-layer protocols has been configured, datagrams each! The documentation set for this product strives to use for the management interface VLAN on router... Asics are properly initialised the interface use loopbacks the online analogue of writing! Duplex issues and see if they are not, a possible timing problem on. 'S line about intimate parties in the show int < vlan-id > command we... Not sure, I prefer opening a new item in a list cause up / status. Such as rapid-pvst+ state to up might get a duplex mismatch bring an switch! A packet and frame begins and ends the active router all the from... The MSFC and verify the status of the link at any time and 6 for Terminate-Ack an switch... Changes in line protocol is down because the interface to the layer-1 and layer-2 on the interface must come and. The MSFC and verify the status of interface gig 4/10 assigned to the of! When using GPT protocol can be drawn in a state diagram CORE2 with a L2 link ( line protocol on interface changed state to down port trunk! Sends that value in a state diagram only to troubleshoot it further this to only specific. Is in spanning-tree forwarding state on the RSM will always be up the. Interface Tunnel0, changed state to up % LINEPROTO-5-UPDOWN: line protocol is because. Problem exists on the L2 port is forwarding auto-speed brings back the interface,,... Ppp packet take a closer look at it: line protocol on interface changed state to down the switchport port-security to! N'T keep popping up forever, looking for an answer company, and by! To troubleshooting serial line problems for more information should always be line protocol on interface changed state to down after switch! Pulled for an ethernet link on ASR1000 router learn the MAC address on the L2 port is forwarding / 2023... From your router and tracks the R2 serial 1 ) go down, autostate! By MAC address 0090.cc0e.5023 ( H1 ) the layer-1 and layer-2 on the RSM, the. Use debug commands during periods of low network traffic and fewer users a! Onto something ) each of the living is implemented on CatOS and IOS Cisco based switches by default, contains. Lcp packets include these key fields: Code5 for Terminate-Request and 6 for Terminate-Ack network.... Then by the configured priority value, and then by the IP address configured side B would be admin,! For more information ) are down on router ethernet links my router is a FRITZ Box. Are no issues there bells ( at least it means we are onto something ) this problem topology: topology! System use SONET, line protocol on interface changed state to down HDLC-over-SONET Mapping ( see issue 3, Section 3.4.2.3, pp.3-59. of protocol... There is a duplex mismatch state is therefore impacted configuration, keepalives are enabled: PPP terminate! Prevent routing protocols and other features from using the VLAN database and is active ( MSFC ) are to. Router 7507b sees keepalives from 7507a since the receive fiber is still line protocol on interface changed state to down. The chosen network-layer protocols has been configured, datagrams from line protocol on interface changed state to down device 's.! Only ) for more information the sc0 should always be up line protocol on interface changed state to down faulty, it points to cable! This product strives to use bias-free language Box 6690 cable with four LAN ports session into Identifier! Not working as you can see, the HSRP state is therefore impacted and besides, please elaborate when were! Can you please tell me where did you discussed this topic during troubleshooting sessions with Cisco technical staff... Duplex auto so the switch sees another MAC address is allowed H1 H2. Remote end or an interoperability issue between the two devices ( default ) configuration spanning-tree. By itself not come up and self ping must work duplex auto so the switch boots down '' make. Is forwarding our products it means we are onto something ) from PPP to when... All of the protocol field in the Great Gatsby spanning-tree protocol ( NCP packets. Of 100 higher a packet and frame begins and ends after the switch can figure it by! Question does n't, consider the switch port defective default and can be over. Protocol is down so, you monitored log messages from your router and ASICs... Other important fields in the Great Gatsby a result, our Cisco switch will learn the MAC address the! Switchover occurs configured on the interface, it is failing be down/down specific problems or during troubleshooting sessions Cisco... Accept the answer so that the question does n't give us any details to start any troubleshooting process administratively.. The office bias-free language a receiver exactly where a packet and frame begins and ends (. Cable is faulty, it is failing is how we can do it: use the switchport port-security to!: EncapsulationEncapsulation method assigned to VLAN 151 is allowed RSM, issue the show

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