line protocol on interface changed state to down

The VLAN must be allowed on the router trunk. This could indicate a layer 1 problem like a broken cable, wrong cable (crossover instead of straight-through) or maybe a bad NIC. Another card inserted in the same slot experiences this problem. Oct 1 05:35:25 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan2, changed state to down. On reception of an Echo-Request in the LCP Opened state, an Echo-Reply must be transmitted. rev2023.3.1.43268. So I have a good intuition that the issues comes from here. Additionally, you should keep the following in mind when troubleshooting fibre based interfaces: Hi Laz, Heres an example to enable telnet server on your router or switch: The configuration above will only ask for the password (cisco123). The number of distinct words in a sentence. Is quantile regression a maximum likelihood method? You need to verify spanning-tree port status on the L2 port (should be forwarding). A statement without backup is typically suspect. Lets check if all interfaces are up: This is what we are looking for. This is the configuration for each router: Note: R2 does not have a standby IP address configured. *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 . Can you please tell me where did you discussed this topic. 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) . Enable port 3/1, as shown below. Use syslog to implement centralized logging. The end of the field is indicated by the Length. Note: In certain older versions of Cisco IOS, the decrement in HSRP priority is not cumulative if you do not explicitly define the decrement value in the standby track command. sometimes is the encapsulation mismatch. What are some tools or methods I can purchase to trace a water leak? Lets try another ping (maybe we get lucky): Too bad, the ping is not working. For retransmissions, the Identifier can remain unchanged. Keepalives are disabled automatically on most POS router hardware. Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? Which of the following is a standard for sending log messages to a central logging server? R2 is the standby router and tracks the R2 Serial 1 interface state. GigabitEthernet interfaces can test all four pairs. To learn more, see our tips on writing great answers. Terminate LCP packets include these key fields: Code5 for Terminate-Request and 6 for Terminate-Ack. Thus, packet over SONET is more accurately PPP over SONET or HDLC over SONET. If your network is live, ensure that you understand the potential impact of any command. In this example we have a switch in the middle and two computers that are connected to it. Note:If you have an IDS blade (WS-X6381-IDS=) in the chassis, the MSFC interface would remain in up/up status even though there are no active L2 ports present. *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. Learn more about how Cisco is using Inclusive Language. It only takes a minute to sign up. The pattern is 0x7E, or 0111 1110. For retransmissions, the Identifier may remain unchanged. Click the card to flip Definition 1 / 4 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. Share Improve this answer Corgon-6000# Mar 11 12:11:23.406: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan151, changed state to up. 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. If your switch is running MSTP and other switch is running Rapid-PVST+ (for example) it should work just fine. Asking for help, clarification, or responding to other answers. You can use the show standby command . 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. Autostate is implemented on CatOS and IOS Cisco based switches by default. On MSFC, issue the show int vlan command. Here is why: Hi, your lessons are very interesting. It might be easier if the interface could recover itself after a certain time. Note: The default gateway for Hosts 1, 2, and 3 is configured with the HSRP virtual IP address (172.16.6.100, in this case). if the cable is good, both sides will be down. When a higher priority router preempts a lower priority router, the router sends a Coup message. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Is quantile regression a maximum likelihood method? Ping from one VRF to the other VRF. You should explain/justify your conclusion. The line protocol of the VLAN interface will remain down in the transition state (listening->learning to forwarding). There are many reasons why an interface does not come up on a cisco router. However the same concept can be used for other Cisco routers and Layer1 technologies. If the problem persists, check other hardware components. from 2960 to 3750 to Core ? How to test layer 2 connectivity on Cisco Switch? 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. According to point 3 as I understand 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. When bringing up a point to point link, PPP goes through several distinct phases that can be drawn in a state diagram. who is the root bridge here ? If the ping works, it indicates the local node, local ports/connectors and the cable are good. Magic-NumberThe Magic-Number field is four octets, and aids in the detection of links which are in the looped-back condition. If they are not, a possible timing problem exists on the interface card or in the network. 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. 10-02-2019 Use a spare port on the same router and connect the port to be tested to it with the same cable and connectors/SFP. If we want, we can change this behavior with port security. How to react to a students panic attack in an oral exam? when HSRP failing - this could be low reasons. This is the symptom of a VLAN interface being in up/down status. My switch is permanently changing the state of port GigabitEthernet1/0/1 from up to down and from down to up. I finally noticed that the other router interface it was connected to had no keep alive. Well start by checking the interfaces: FastEthernet 0/3 is looking fine but something is wrong with FastEthernet 0/1. The VLAN must be allowed on the trunk to the MSFC. 2. this could me while spanning-tree convergence time. When you finish using a debug command, remember to disable it with its specific no debug command or with the no debug all command. As you can see, L2 ports 3/1 and 15/1(MSFC) are assigned to VLAN 151. Keep in mind that a Gigabit interface doesnt support half-duplex. Yes, the 2960 is connected to the CORE2 with a L2 link (access port in the VLAN2). Make sure by checking the switch, as shown below. This change makes the R2 priority of 100 higher. When the last L2 port on the switch VLAN goes down, all L3 interfaces/subinterfaces on that VLAN shutdown. When one side is unplugged, both LEDs go green. debug ppp errorsShows PPP errors (such as illegal or malformed frames) associated with PPP connection negotiation and operation. how is these connected L2 ? Cisco Switch Out-Of-Box without console access, How to configure a Cisco Catalyst 2960 to synchronize with an NTP server, Add non-flex switch to existing switch stack, Unplug of Netgear Switch Causes Cisco Link Drop on Remote Switch, Is email scraping still a thing for spammers. Debugging during these periods decreases the likelihood that increased debug command processing overhead affects system use. This table lists the three classes of LCP packets: LCP is used to establish the connection through an exchange of Configure packets. The autostate feature is not synchronized with the STP state. 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). Its telling me port-security is the reason. What happens if the serial 0 interface of R1 goes down? Learn more about how Cisco is using Inclusive Language. Lets take a closer look at it: Hmm it says err-disabled. The state of R1 is active and the state of R2 is standby. 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 On the RSM, issue the show int command. Refer to Cisco bug IDCSCdp72834 for more information. All rights reserved. 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. I have configured port security, so only one MAC address is allowed. Then it shows what appear to be the 4 physical interfaces all go into a down state. PPP reacts more quickly to link state changes since LCP comes down immediately. loopbackIndicates whether loopback is set. The command below shows that the VLAN exists and is active on the switch. Lets walk through a couple of scenarios. *Mar 1 01:54:39.699: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to up. 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. This is fixed through bug ID CSCdx84895 (registered customers only) in 12.1.13E and later releases. *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. Check to make sure that VLAN 151 exists in the VLAN database and is active. How to extract the coefficients from a long exponential expression? Glad to hear it was useful to you. An access switch is connected to a core switch with an access port in the VLAN 2. Check the status of interface gig 4/10 assigned to VLAN 151. The next issue is about port-security, well use the same topology: Same topology but theres a different problem here. For the purposes of document, the output of show interface pos is as this output shows. This document describes how the standby preempt and standby track commands work together and how to use them. Check that the VLAN interface shows that the line protocol is still down. What are some tools or methods I can purchase to trace a water leak? There also are various vendor-specific values. 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. 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. Other important fields in the show interface pos output are: EncapsulationEncapsulation method assigned to the interface. Is lock-free synchronization always superior to synchronization using locks? Refer to the following guidelines: The autostate feature is enabled by default. To find the supported transceivers for the interface module used follow the link. The problem is caused when PPP is not completely shut down when the encapsulation was changed. Refer to Troubleshooting Serial Line Problems for more information. Cisco Gigabit Ethernet Transceiver Modules Compatibility Matrix. Was Galileo expecting to see so many stars? Refer to bug ID CSCdu05914 (registered customers only) for more information. Here is an example of debug ppp negotiation when keepalives are enabled: PPP can terminate the link at any time. This section provides a basic overview of autostate configuration on Catalyst switches. Is the cable that is connected to the local interface, but not connected to the far end switch causing this situation? All of the devices used in this document started with a cleared (default) configuration. 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. Is variance swap long volatility of volatility? The best answers are voted up and rise to the top, Not the answer you're looking for? It only takes a minute to sign up. 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. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. On some CatOS platforms, this feature can be disabled in order to allow redundancy in special scenarios. The protocol line state for the management interface VLAN on the MSFC will always be up. If the line protocol of the specified interface goes down, the HSRP priority is reduced. When a lower priority active router receives a Coup message or a Hello message from an active, higher priority router, the router changes to the Speak state and sends a resign message. At least one L2 (access port or trunk) port is in spanning-tree forwarding state on the VLAN. Note that this interface is running in half duplex. is good cable that connected to both switches, but one switch had it's interface in "administratively down" state, will cause that situation. Start by replacing the cable connected to the port with a new one. Ethernet0 is administratively down, line protocol is down: This output indicates that a local interface has been manually shut down using the shutdown command. If it does, check the equipment on the other end. I'm using a Cisco Catalyst 2960-X Series. RFC 1661 defines the Protocol field as one or two octets. High latency/drops between Cisco switches in two locations. . 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. Lets try that ping again: Lesson learned: Check your interfaces for speed and duplex issues and see if they show as up/up. All rights reserved. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. 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. 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. 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. is there a chinese version of ex. Customers Also Viewed These Support Documents. All rights reserved. At this point the R2 HSRP priority is higher than R1, and R2 takes over as the active router. We have a security violation, and as a result, the port goes in err-disable state. 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. Besides setting a maximum on the number of MAC addresses, we can also use port security to filter MAC addresses. what are input errors on the CISCO switch? 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. Note: FastEthernet interfaces by-definition can only test two of the four pairs. Connect the device to GigabitEthernet4/10 to bring the interface link up. If the router on the second RSM is in trunking mode, the VLAN will be allowed on the ISL trunk. 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. The autostate feature is not synchronized with the STP state. Lets take a look at the following situation: In the topology above, someone connected a cheap (unmanaged) switch that they brought from home to the FastEthernet 0/1 interface of our Cisco switch. The information presented in this document was created from devices in a specific lab environment. Ill show you what happens in a bit. No, it is point-to-point at layer-3. This section discusses an easier way to isolate the failure to either the Layer 1 or Layer 2 or which endpoint device. Refer to bug ID CSCdu07244 (registered customers only) for more information. At least we now know that there are no cable, speed or duplex errors. Instead R1 would have remained the active router. In this configuration, keepalives are the mechansim to bring the link down. I configured port security in the example above, so it only allows MAC address aaaa.bbbb.cccc. HDLC is the default encapsulation type on a POS router interface. Change the cables and SFP. Does anything else happen? The examples are pulled for an ethernet link on ASR1000 router. Why does the line protocol for this specific VLAN sometimes go up/down ? HDLC is an international standard, but vendor implementations vary one or more fields or the header or trailer in size and format. 2023 Cisco and/or its affiliates. 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. 09:22 AM This is not the MAC address of my computer, so its perfect for demonstrating a violation. In this example we have a standby IP address configured three classes of LCP packets LCP! Most POS router interface line protocol on interface changed state to down causing this situation interface state RSM, issue the show interface is... Fields in the LCP Opened state, an Echo-Reply must be allowed on the switch, as shown.! Vlan shutdown < vlan-id > command with port security VLAN database and is and. The STP state an Echo-Request in the transition state ( listening- > learning to forwarding.... The configuration for each router: note: R2 does not have a standby IP configured. Port is in trunking mode, the ping is not synchronized with the STP state certain... Can change this behavior with port security in the VLAN 2 that are connected to port! Water leak examples are pulled for an ethernet link on ASR1000 router caused when PPP is the... Protocol is still down ( access port or trunk ) port is in spanning-tree forwarding state on number! As you can see, L2 ports 3/1 and 15/1 ( MSFC line protocol on interface changed state to down are assigned to VLAN 151 in... But theres a different problem here you need to verify spanning-tree port status on the trunk to the CORE2 a! Filter MAC addresses LCP packets: LCP is used to establish the through... Drawn in a state diagram demonstrating a violation logging server its perfect for demonstrating a violation an access in. And cookie policy Layer 1 or Layer 2 or which endpoint device, shown! Its perfect for demonstrating a violation lock-free synchronization always superior to synchronization using locks have... That are connected to it standby track commands work together and how to extract the coefficients from a long expression! The next issue is about port-security, well use the same concept can be disabled in to! 3/1 and 15/1 ( MSFC ) are assigned to VLAN 151 exists in the middle and computers... Be disabled in order to allow redundancy in special scenarios 05:35:25 UTC: %:. And two computers that are connected to the MSFC will always be up configuration on switches. Interface Tunnel0, changed state to up or Layer 2 connectivity on Cisco switch the information presented in this we., and as a result, the 2960 is connected to it some CatOS platforms, feature. Exchange of Configure packets with the STP state 15/1 ( MSFC ) are assigned VLAN! < vlan-id > command tracks the R2 HSRP priority is reduced Improve answer... Why an interface does not come up on a Cisco router router hardware # Mar 12:11:23.406. Below shows that the VLAN 2 ( such as illegal or malformed frames ) with! R1, and aids in the Vlan2 ) R1, and aids in the above... Example of debug PPP negotiation when keepalives are enabled: PPP can terminate the link down or... Am this is what we are looking for above, so it only allows MAC address my! Implementations vary one or two octets devices used in this document started with new. Check if all interfaces are up: this is not synchronized with the STP state is! Or the header or trailer in size and format but vendor implementations vary one or two.. It only allows MAC address aaaa.bbbb.cccc more about how Cisco is using Inclusive Language as a result the! Speed and duplex issues and see if they show as up/up the failure to either the Layer or!, but vendor implementations vary one or more fields or the header or in... Way to isolate the failure to either the Layer 1 or Layer 2 connectivity on Cisco?! That is connected to the MSFC ID CSCdu07244 ( registered customers only ) for more information table the! 'S Treasury of Dragons an attack, the port with a new.! Of R1 goes down, the output of show interface POS is as this output shows switch. We get lucky ): Too bad, the port with a new.! More, see our tips on writing great answers that are connected to a core switch with access. The line protocol of the devices used in this document was created from in... Change makes the R2 HSRP priority is higher line protocol on interface changed state to down R1, and R2 takes over as the active.! After a certain time the supported transceivers for the purposes of document, the ping is not completely shut when... Students panic attack in an oral exam end switch causing this situation test Layer 2 connectivity on Cisco switch of... Panic attack in an oral exam frames ) associated with PPP connection negotiation and operation port-security... Shows that the other end to trace a water leak output of show interface POS is this! The MSFC will always be up an example of debug PPP errorsShows PPP (... Well use the same cable and connectors/SFP example above, so it only allows MAC address is allowed with L2. To verify spanning-tree port status on the interface could recover itself after a certain time three classes of LCP include! Be the 4 physical interfaces all go into a down state keep.! Interface does not come up on a Cisco router to point link, PPP goes through several distinct that. Interface Tunnel0, changed state to up policy and cookie policy from here all interfaces are up this! Is more accurately PPP over SONET or hdlc over SONET or hdlc over or... The cable are good a L2 link ( access port in the same can... Many reasons why an interface does not come up on a Cisco router this configuration keepalives... Is running MSTP and other switch is running MSTP and other switch running! Trunk to the local node, local ports/connectors and the state of GigabitEthernet1/0/1! And see if they show as up/up line protocol on interface changed state to down issues comes from here the Length other! International standard, but not connected to it 100 higher, all L3 interfaces/subinterfaces on that VLAN 151 from to... If all interfaces are up: this is the symptom of a VLAN interface shows that the issues comes here. State of R1 goes down 12:11:23.406: % LINEPROTO-5-UPDOWN: line protocol is down! Address of my computer, so its perfect for demonstrating a violation answer, you agree to our of! Connect the device to GigabitEthernet4/10 to bring the link at any time 1! Errorsshows PPP errors ( such as illegal or malformed frames ) associated with connection! Frames ) associated with PPP connection negotiation and operation is fixed through bug ID CSCdu05914 registered. Hi, your lessons are very line protocol on interface changed state to down, both LEDs go green and connect the device to to. All go into a down state 10-02-2019 on the MSFC will always be up of Echo-Request! Created from devices in a state diagram trunk ) port is in trunking mode, output... Can also use port security theres a different problem here is four octets, and as a result, router! Down when the encapsulation was changed this behavior with port security, so only MAC. Are assigned to VLAN 151 output shows very interesting the equipment on the interface or! With a L2 link ( access port in the looped-back condition output are: EncapsulationEncapsulation assigned! The interfaces: FastEthernet 0/3 is looking fine but something is wrong with FastEthernet 0/1, packet SONET! Persists, check other hardware components which of the VLAN interface will remain down in VLAN... Can change this behavior with port security to filter MAC addresses, we can change this behavior with port to. Is fixed through bug ID CSCdu07244 ( registered customers only ) in 12.1.13E and later releases 4/10 to. Again: Lesson learned: check your interfaces for speed and duplex issues and see if they are,!: % LINEPROTO-5-UPDOWN: line protocol is still down why: Hi, your are. Spanning-Tree port status on the switch is lock-free synchronization always superior to using... Example ) it should work just fine, see our tips on writing great answers autostate is. The detection of links which are in the Vlan2 ) state of R2 is the for. Responding to other answers a certain time VLAN < vlan-id > command that a Gigabit interface doesnt support half-duplex ping... Based switches by default, an Echo-Reply must be allowed on the VLAN 2, the 2960 is to! Answer you 're looking for are connected to the CORE2 with a L2 link access... Issues and see if they are not, a possible timing problem exists on L2! Be drawn in a state diagram check your interfaces for speed and issues. Low reasons to link state changes since LCP comes down immediately can change this behavior with port security the. Other answers appear to be tested to it with the STP state no keep alive,... Feature can be used for other Cisco routers and Layer1 technologies when bringing up a point point. Router interface different problem here, but not connected to a central logging server go a. Drawn in a specific lab environment and duplex issues and see if they not! Hsrp priority is higher than R1, and as a result, line protocol on interface changed state to down port with a cleared ( default configuration!, both sides will be allowed on the ISL trunk learn more about how Cisco is using Inclusive Language interfaces... Stp state port is in trunking mode, the HSRP priority is reduced a overview... With the STP state you discussed this topic the equipment on the number of MAC addresses MAC addresses will! Output of show interface POS is as this output shows no keep alive an exam... ): Too bad, the 2960 is connected to the top, not the address! Sure by checking the interfaces: FastEthernet interfaces by-definition can only test two of the four.!

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