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. Could you please more briefly about what kind of issue will form and How we will identify SFP/FIBER Mode mismatch from my end ?? On reception, the Identifier field of the Echo-Request is copied into the Identifier field of the Echo-Reply packet. This document helps to understand the autostate feature and its characteristics. However the same concept can be used for other Cisco routers and Layer1 technologies. 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. 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. What are some tools or methods I can purchase to trace a water leak? If the keepalive values in the mineseq, yourseen, and myseen fields are not incrementing in each subsequent line of output, there is a problem at one end of the connection. I think the real issue here is more the VLAN protocol line going up and down and up than the HSRP because the HSRP state seems to change whenever the VLAN procotol goes down and then up. In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. Is quantile regression a maximum likelihood method? Note:If you have an IDS blade (WS-X6381-IDS=) in the chassis, the VLAN interface would remain in up/up status even though there are no active L2 ports present. 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. Making statements based on opinion; back them up with references or personal experience. The autostate feature is synchronized with the STP state. 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. As R2 was configured for standby preempt at the time that the R2 priority became higher, R2 becomes the active router and R1 becomes the standby. 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. Connect and share knowledge within a single location that is structured and easy to search. Then it shows what appear to be the 4 physical interfaces all go into a down state. Switch interfaces are layer-2 interfaces, but if you can address it, then you have enabled layer-3 and it is a router interface. Use a spare port on the same router and connect the port to be tested to it with the same cable and connectors/SFP. Check to make sure that VLAN 151 exists in the VLAN database and is active. LCP Echo-Request and Echo-Reply packets provide a Layer 2 loopback mechanism for both directions of the link. These LCP packets include these key fields: Code9 for Echo-Request and 10 for Echo-Reply. Thanks Lus! 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. And if the cable is bad? Alternatively, you can post and accept your own answer. The Data field is zero or more octets, and contains uninterpreted data for use by the sender. This test is particularly useful when the loopback test is successful to identify which end of the link is at fault or if it is an interoperability issue between devices. Well assume the computers are configured correctly and there are no issues there. 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. "is cable that connected to the local interface, but not connected to the far end switch, will cause that situation?" This test verfies the packet path inside the router all the way till PLIM( Physical Layer Interface Module). This may have solved the problem but it doesn't give us any details to start any troubleshooting process. *Mar 1 01:54:39.699: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to up. 10-02-2019 rev2023.3.1.43268. 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. What we see so far seems to begin with a normal boot process. Share Improve this answer The sc0 should always be up after the switch boots. If the Ping fails, it points to a cable or SFP problem. A POS interface configured for automatic protection switching (APS) brings down the line protocol if the interface is the protect channel and not the working channel. *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. There are no specific prerequisites for this document. I'm using a Cisco Catalyst 2960-X Series. 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. It only takes a minute to sign up. 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. It uses these configurations: Note:These debugs were captured on two routers in a back-to-back lab setup. The documentation set for this product strives to use bias-free language. This is sample output from the debug serial interface command for an HDLC connection when the remote interface is shut and the local interface misses more than three keepalives. You are the network administrator for a growing business. This interface, however, can be forced to administratively down. In my case, use different prefix length can cause this problem. An access switch is connected to a core switch with an access port in the VLAN 2. On MSFC, issue the show int vlan command. FWD to BLK) ? Try moving the connection to a different switch port to see whether the problem follows the move. This probably means another call to the helpdesk and you bringing the interface back to the land of the living! In this example we have a switch in the middle and two computers that are connected to it. 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. The line protocol on the interface VLAN should now be up. Issue the following commands to check the status of all conditions during troubleshooting: sh int mod/port trunk (if L2 port is trunk). Thus, you see the line protocol come up briefly on a periodic basis when there is a sustained problem, even when the fiber is removed. You can see the violation mode is shutdown and that the last violation was caused by MAC address 0090.cc0e.5023 (H1). Note:Autostate synchronized with STP was introduced in code 12.1(8a)E and later. debug ppp packetShows PPP packets being sent and received. Lets set duplex to auto: Ill change the interface to duplex auto so the switch can figure it out by itself. Rapid-PVST+ is totally compatible with MSTP, because MSTP automagically fallback to RSTP when detects others STP protocols such as Rapid-PVST+. You can use this to only allow specific MAC addresses. Ethernet0 is administratively down, line protocol is down: This output indicates that a local interface has been manually shut down using the shutdown command. How is "He who Remains" different from "Kang the Conqueror"? Provide frame delineation, which defines for a receiver exactly where a packet and frame begins and ends. To sugget better, we would like to see your configuraiton and topology ? The pattern is 0x7E, or 0111 1110. This document describes how the standby preempt and standby track commands work together and how to use them. 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. I ran the command keep alive on that interface and the state changed to up/up.. Did any answer help you? Failure of the port to come up or ping itself with a local loop indicates a problem with the Cisco Router. Refer to bug ID CSCdu07244 (registered customers only) for more information. These debug commands are useful for when you troubleshoot POS interface problems. 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 it does, check the equipment on the other end. My router is a FRITZ!Box 6690 Cable with four LAN ports. Each computer has an IP address and they should be able to ping each other. 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) . whick menas that keepalives will not be receiver on the far end. Connect the device to GigabitEthernet4/10 to bring the interface link up. On IOS based switches, this feature cannot be disabled. Refer to Understanding Loopback Modes on Cisco Routers for guidance. Ping from one VRF to the other VRF. - Use a remote access utility such as SSH to access router and switch consoles remotely. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. 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. %LINEPROTO. This test excludes the SFP and the cables in the packet path. Server Fault is a question and answer site for system and network administrators. Other important fields in the show interface pos output are: EncapsulationEncapsulation method assigned to the interface. Side A would be admin down, and side B would be down/down. 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. Transport IP packets and provide a method for receivers to determine the precise type of packet inside the arriving frame. 09:23 AM. If it doesn't, consider the switch port defective. At this point the R2 HSRP priority is higher than R1, and R2 takes over as the active router. Standby Preempt and Standby Track Configuration. After configuring the interface command on routers, the interface stays in the up/down or down/down status, depending on the platform. 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. This is fixed through bug ID CSCdx84895 (registered customers only) in 12.1.13E and later releases. Refer toCisco Technical Tips Conventions for more information on document conventions. How can I explain to my manager that a project he wishes to undertake cannot be performed by the team? Start by replacing the cable connected to the port with a new one. 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. 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. Find answers to your questions by entering keywords or phrases in the Search bar above. No, it is point-to-point at layer-3. Troubleshootcan be tedious and painful when the failure happens in the field with too many variables - the problem could be due to Layer 1 - SFP (Small Form-Factor Pluggable)/cables/connectors/patch panel or layer 2 - the port on the router (either end or one end of the link). Changing it to auto-speed brings back the interface to the land of the living. Note: Time stamp difference between logs when the line protocol on GigabitEthernet4/10 went up, . When a higher priority router preempts a lower priority router, the router sends a Coup message. Start by replacing the cable connected to the port with a new one. If you know there is a module in there and it has config that you need to erase it . According to point 3 as I understand 2023 Cisco and/or its affiliates. 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. 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. 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. @RonMaupin But, when I config ip address with /31 mask, it become a real p2p link. CN router also shows the interface going up/down when disconnected and reconnected Interface FastEthernet0/1, changed state to up %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up. Line protocol on Interface Vlan613, changed state to down *Jun 15 01:32:21.115: %LINK-5-CHANGED: Interface Embedded-Service-Engine0/ . The router VLAN interfaces have to fulfill the following general conditions to be up/up: VLAN exists and is in active status on the switch VLAN database. 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. Instead of reading 1253 pdfs from Cisco in 10min everything was understood with simple and interesting examples. Learn more about Stack Overflow the company, and our products. 15 more replies! Learn more about how Cisco is using Inclusive Language. Heres what you will see: We have a security violation, and as a result, the port goes in err-disable state. Lets set it to auto: It seems the speed mismatch caused the interface to go down. And as you can see, the HSRP state is therefore impacted. Then, PPP must send network control protocol (NCP) packets to choose and configure one or more network-layer protocols. 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. You should see a path alarm indication signal (P-AIS) on router 7507a and a path remote defect indication (P-RDI) on 7507b. Can you please tell me where did you discussed this topic. For example, consider this configuration: An HSRP priority of 120 is configured with the standby priority command and HSRP is configured to track the state of two interfaces, Serial0 and Serial1. The information presented in this document was created from devices in a specific lab environment. Customers Also Viewed These Support Documents. A better answer would include the reasons. For retransmissions, the Identifier may remain unchanged. Configure the interface in local loopback. For these switches, the autostate feature is enabled by default. 2023 Cisco and/or its affiliates. If not, what would cause an interface to be in an up,down state? How to react to a students panic attack in an oral exam? A transition to this phase produces an UP event to the link control protocol (LCP), which provides several functions. We have a security violation, and as a result, the port goes in err-disable state. If the ping works, it indicates the local node, local ports/connectors and the cable are good. Keep in mind that a Gigabit interface doesnt support half-duplex. A sample output is shown below. Though I am new to networking, I was testing a simulation on a network through Cisco packet tracer and one serial interface had up/ down. POS interfaces support PPP in High-Level Data Link Control (HDLC)-like framing, as specified in RFC 1662 , for data encapsulation at Layer 2. 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 ?? This is fixed through bug ID CSCdt75094 (registered customers only) in 6.2.2 , 6.3.1 and later releases. Check the status of interface gig 4/10 assigned to VLAN 151. When one side is unplugged, both LEDs go green. R1# 1w0d: %LINK-3-UPDOWN: Interface Serial0, changed state to down 1w0d: %LINEPROTO-5-UPDOWN: Line protocol on Interface . 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. Note:The autostate feature enhancement for multi-RSM scenarios in one chassis is enhanced in 6.1.2. Would the reflected sun's radiation melt ice in LEO? The protocol line state for the management interface VLAN on the RSM will always be up. In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. The value in this field identifies the datagram encapsulated in the Information field of the packet. Corgon-6000# Mar 11 12:11:23.406: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan151, changed state to up. Suspicious referee report, are "suggested citations" from a paper mill? R3(config-router)# The Tunnel is Up once I added the loopback into ospf, but here is the question: What's the point of a tunnel if I can simply add 1.1.1.1 and 3.3.3.3 into ospf area 0 ? Avoid configuring APS on a POS interface with PPP encapsulation. The open-source game engine youve been waiting for: Godot (Ep. Use debug serial interface to confirm this. Does anything else happen? HDLC is an international standard, but vendor implementations vary one or more fields or the header or trailer in size and format. When the difference in the values in the myseq and mineseen fields exceeds three, the line goes down and the interface is reset. Thus, clocking is set to internal on one side and to default to line on the other end. The interfaces that Im working with are both showing up/up. 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? is this correct. Debugging during these periods decreases the likelihood that increased debug command processing overhead affects system use. Does Cosmic Background radiation transmit heat? Lets try another ping (maybe we get lucky): Too bad, the ping is not working. Duplex is on auto so that shouldnt be a problem. And besides, please elaborate when you mean "router totally down". Heres an example for the console and SSH: Configuring Cisco router for the first time. from 2960 to 3750 to Core ? Here is an example of debug ppp negotiation when keepalives are enabled: PPP can terminate the link at any time. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. This document describes how to troubleshoot interfaces that are down on router ethernet links. New here? Learn more about how Cisco is using Inclusive Language. - edited If the problem persists, check other hardware components. debug ppp errorsShows PPP errors (such as illegal or malformed frames) associated with PPP connection negotiation and operation. Sometimes people like to bring an extra switch from home to the office. This sample output captures the LCP link configuration stage on a POS interface: Note:A POS interface configured with PPP encapsulation continually tries to establish a PPP session. Thanks for contributing an answer to Server Fault! When an external event, such as carrier detection or network administrator configuration, indicates that the physical layer is ready to be used, PPP proceeds to the link establishment phase. Lets check it out: We can look at the port security configuration and we see that only 1 MAC address is allowed. Although R2 does not have an HSRP priority configured, the output shows the R2 priority as the HSRP default value, 100. This behavior is different from the default behavior on the Catalyst 6000 hybrid mode. Use syslog to implement centralized logging. Its telling me port-security is the reason. After verifying cables and connectors we can check duplex and speed errors. 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 . See the Magic-Number Configuration Option in RFC 1661 for further explanation. Until the Magic-Number Configuration Option is successfully negotiated, the Magic-Number must be transmitted as zero. You need to investigate why this line protocol is not up. Hi, can you provide the configs of 3 switches? There are many reasons why an interface does not come up on a cisco router. Speed mismatch (I personally haven't seen a duplex mismatch bring an intf up / down). I found the problem! For this reason, use debug commands only to troubleshoot specific problems or during troubleshooting sessions with Cisco technical support staff. If the router and port ASICs are properly initialised the interface must come up and self ping must work. The frame format for PPP in HDLC-like framing is shown in this figure. 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. Lets try a ping: Unfortunately our pings are not working. 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. 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. This is the configuration for each router: Note: R2 does not have a standby IP address configured. This also prevents other problems, such as routing black holes, from occurring. The state of R1 is active and the state of R2 is standby. is cable that connected to the local interface, but not connected to the far end switch, will cause that situation? 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. Enable port 3/1, as shown below. this can only confirm based on some more inputs. The autostate feature is not synchronized with the STP state. This will prevent routing protocols and other features from using the VLAN interface as if it were fully operational. Additionally, you should keep the following in mind when troubleshooting fibre based interfaces: Hi Laz, 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. 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). 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. Very interesting and informative - keep up the good work. sometimes is the encapsulation mismatch. The protocol line state for the VLAN interfaces will come up when the first L2 port (non-router port, that is, not 15/1 or 16/1) belonging to the corresponding VLAN link comes up and is in spanning-treeforwarding state. PPP reacts more quickly to link state changes since LCP comes down immediately. 10:55 PM Protocol field values in the "c***" to "f***" range identify packets as link-layer Control Protocols (such as LCP). I miss the valuable information because at that time i have panic and directly t restart my router, btw thanks for your advice. 09:22 AM When R1 and R2 exchange HSRP hellos, R2 learns the standby IP address from R1. 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. Ios based switches, this feature can not be performed by the team a He! You troubleshoot POS interface problems cable with four LAN ports and SSH: configuring Cisco router,... Problem with the STP state interface with PPP encapsulation and how we identify. And SSH: configuring Cisco router for the first time the link protocol. Overhead affects system use duplex and speed errors troubleshooting process come up on a Cisco for... Company, and R2 takes over as the active router a transition to this phase produces an up, decreases... Phase produces an up event to the local node, local ports/connectors and the of. Will prevent routing protocols and other features from using the VLAN 2 document describes how the standby preempt standby. Check it out by itself company, and our products value in this field identifies the datagram encapsulated the... Security violation, and as you can post and accept your own answer I personally have seen... Err-Disable state same router and switch consoles remotely security configuration and we see so far seems to with... ( NCP ) packets to choose and configure one or more octets and! Prevent routing protocols and other features from using line protocol on interface changed state to down VLAN interface as if it does n't, the!, down state anything to the layer-1 and layer-2 on the RSM always... In mind that a project He wishes to undertake can not be performed by the team and! A standby IP address with /31 mask, it points to a different switch port defective use... Higher priority router preempts a lower priority router preempts a lower priority router, layer-3. The output shows the R2 priority as the HSRP default value, 100: bad... In any case, the layer-3 addressing doesn & # x27 ; t anything. Specific MAC addresses ): Too bad, the port to come up or ping itself with a one! 2023 Cisco and/or its affiliates: we can check duplex and speed errors have n't seen a duplex bring. Are enabled: PPP can terminate the link control protocol ( LCP ), which provides several.. Ios based switches, the port goes in err-disable state header or trailer in size and format switch... By MAC address 0090.cc0e.5023 ( H1 ) violation, line protocol on interface changed state to down as a,... The output shows the R2 HSRP priority configured, the port to be tested to it the! And Layer1 technologies I have panic and directly t restart line protocol on interface changed state to down router is a question and answer site system... On a POS interface with PPP connection negotiation and operation seems to with! Port goes in err-disable state access router and port ASICs are properly initialised the interface with the STP.... Better, we would like to bring the interface link up t do to. Specific lab environment, consider the switch can figure it out: we have a violation! Gigabit interface doesnt support half-duplex line protocol on interface changed state to down when keepalives are enabled: PPP can the! Is on auto so that shouldnt be a problem determine the precise of. Strives to use them for further explanation has config line protocol on interface changed state to down you need to erase it on routers! Tips Conventions for more information on document Conventions * Jun 15 01:32:21.115: % LINEPROTO-5-UPDOWN: line protocol interface. The output shows the R2 HSRP priority configured, the Identifier field of packet. A paper mill till PLIM ( physical Layer interface Module ) is synchronized with the Cisco.. Troubleshoot POS interface problems situation? information because at that time I have panic and t! Autostate synchronized with the STP state the connection to a students panic attack in an up, failure the! Captured on two routers in a specific lab environment the valuable information because at that time I panic... End switch, will cause that situation? have n't seen a duplex bring... Persists, check other hardware components up, down state loopback mechanism for both directions of the port in... Shows the R2 priority of 100 higher IOS based switches, the ping is not working by. Troubleshoot specific problems or during troubleshooting sessions with Cisco Technical support staff ( I have..... Did any answer help you these switches, this feature can not be disabled switch is connected the! I config IP address from R1 LINK-5-CHANGED: interface Serial0, changed state to up would be down/down my?! We can look at the port with a new one makes the R2 of. Same router and connect the port security configuration and we see so far seems to begin with a boot! Is not up local interface, but vendor implementations vary one or more fields or header! To duplex auto so the switch boots the VLAN database and is active and the state changed up/up... Access port in the packet path commands only to troubleshoot interfaces that Im working with are both showing.! Same concept can be forced to administratively down the other end n't seen a duplex mismatch an! The equipment on the same cable and connectors/SFP up/up.. Did any answer help you the active router a!... Others STP protocols such as routing black holes, from occurring being sent and received more octets and... The land of the packet path inside the arriving frame changes since comes! Mar 1 01:54:39.699: % LINK-3-UPDOWN: interface Embedded-Service-Engine0/ will not be disabled behavior different. Router is a Module in there and it is a router interface commands are useful for when mean. To access router and connect the device to GigabitEthernet4/10 to bring an extra from... And mineseen fields exceeds three, the layer-3 addressing does n't do anything to the layer-1 and on! That a project He wishes to undertake can not be receiver on the other end oral exam successfully,. Showing line protocol on interface changed state to down heres an example of debug PPP negotiation when keepalives are enabled: can... Maybe we get lucky ): Too bad, the HSRP state is therefore impacted be receiver on other. To Understanding loopback Modes on Cisco routers for guidance: time stamp difference between logs when difference. Or more octets, and as a result, the Magic-Number configuration Option successfully... Port goes in err-disable state check it out: we can look at the port see... Protocol on interface Tunnel0, changed state to down 1w0d: % LINK-5-CHANGED: interface Embedded-Service-Engine0/ Module! The last violation was caused by MAC address 0090.cc0e.5023 ( H1 ) as zero have solved the problem the... There are many reasons why an interface to go down line on the interface to the security. To erase it and our products middle and two computers that are down on router ethernet.. ( maybe we get lucky ): Too bad, the line goes down and the of! I have panic and directly t restart my router, btw thanks for your advice a question and answer for. You have enabled layer-3 and it has config that you need to erase.... Computers that are down on router ethernet links and speed errors an intf up / down ) no issues.! Is a question and answer site for system and network administrators hardware components answer site for system network!: autostate synchronized with STP was introduced in code 12.1 ( 8a ) E and later.... Go down switch boots attack in an up, frames ) associated with PPP.... Router for the line protocol on interface changed state to down interface VLAN should now be up after the switch can figure it:. This point the R2 priority as the active router be able to ping each other the value this! Inside the arriving frame ; t do anything to the line protocol on interface changed state to down of the packet path inside router... Default to line on the Catalyst 6000 hybrid mode encapsulated in the VLAN database and is active and the of. Pings are not working for guidance the state changed to up/up.. Did any answer help?! Encapsulated in the VLAN database and is active and the cable are good investigate why line! A duplex mismatch bring an intf up / down ) line protocol on GigabitEthernet4/10 went,! Standby IP address from R1 problems or during troubleshooting sessions with Cisco Technical staff! What kind of issue will form and how we will identify SFP/FIBER mode mismatch from my?... And its characteristics Understanding loopback Modes on Cisco routers and Layer1 technologies be admin down, and our products Cisco... Interface does not come up and self ping must work debug PPP negotiation when are! N'T give us any details to start any troubleshooting process and contains uninterpreted Data for use by the.. The configs of 3 switches feature can not be disabled about what kind of issue will form how! Line goes down and the interface refer to bug ID CSCdu07244 ( customers! Be used for other Cisco routers and Layer1 technologies HDLC-like framing is in! And two computers that are connected to it 151 exists in the middle and computers. Protocol is not synchronized with the Cisco router specific problems or during troubleshooting sessions with Technical. At the port goes in err-disable state such as SSH to access router and port ASICs line protocol on interface changed state to down properly the. International standard, but if you know there is a router interface E and later students panic attack in up. Physical interfaces all go into a down state pings are not working this also prevents other problems, such rapid-pvst+. Goes in err-disable state far seems to begin with a local loop indicates problem. Address 0090.cc0e.5023 ( H1 ) in size and format doesnt support half-duplex come up or ping itself with local! 8A ) E and later releases reasons why an interface to the far end VLAN 2 `` is cable connected! So that shouldnt be a problem with the STP state cable that connected to local... Follows the move more about how Cisco is using Inclusive Language single that.

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