line protocol on interface changed state to down

HDLC is an international standard, but vendor implementations vary one or more fields or the header or trailer in size and format. 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. What happens if the serial 0 interface of R1 goes down? Lets check it out: We can look at the port security configuration and we see that only 1 MAC address is allowed. 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. There are no specific requirements for this document. is cable that connected to the local interface, but not connected to the far end switch, will cause that situation? Check the status of interface gig 4/10 assigned to VLAN 151. as in example? You should see a path alarm indication signal (P-AIS) on router 7507a and a path remote defect indication (P-RDI) on 7507b. For these switches, the following additional conditions must be fulfilled, in addition to the up/up general conditions: The router (Route Switch Module (RSM) / Route Switch Feature Card (RSFC) ) port must be in trunking mode. 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. Use show port-security interface to see the port security details per interface. Hi, can you provide the configs of 3 switches? Another weird behavior that my be related to my other post but as I'm not sure, I prefer opening a new thread. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! This could indicate a layer 1 problem like a broken cable, wrong cable (crossover instead of straight-through) or maybe a bad NIC. 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. This phrase has several connotation. New here? Make sure by checking the switch, as shown below. The documentation set for this product strives to use bias-free language. The sc0 should always be up after the switch boots. Failure of the port to come up or ping itself with a local loop indicates a problem with the Cisco Router. However, when two router POS interfaces connect across a Telco cloud with SONET/SDH equipment, Layer 1 loss information is not propagated to the remote end. Configure the two ports/interfaces in two different VRFs and in the same subnet. 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. This problem is resolved in Cisco bug ID CSCdp86387 (registered customers only) . Cisco ethernet interfaces are normally down / down if they don't have a link. For retransmissions, the Identifier may remain unchanged. Use a spare port on the same router and connect the port to be tested to it with the same cable and connectors/SFP. At this point the R2 HSRP priority is higher than R1, and R2 takes over as the active router. 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, . %LINEPROTO. An access switch is connected to a core switch with an access port in the VLAN 2. GigabitEthernet interfaces can test all four pairs. All rights reserved. Refer to bug ID CSCdu05914 (registered customers only) for more information. Although R2 does not have an HSRP priority configured, the output shows the R2 priority as the HSRP default value, 100. 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. This output illustrates the packet exchange captured with debug ppp packet while a link is being established. 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. 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. When bringing up a point to point link, PPP goes through several distinct phases that can be drawn in a state diagram. Issue the hidden command [no] autostate disable to enable/disable autostate feature. On reception, the Identifier field of the Terminate-Request is copied into the Identifier field of the Terminate-Ack packet. Side A would be admin down, and side B would be down/down. Jordan's line about intimate parties in The Great Gatsby? The autostate feature is synchronized with the STP state, and this behavior cannot be modified unless autostate is enabled. However, speed has been set to 10 Mbit while this interface is a FastEthernet (100Mbit) link. 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) . You can use the show standby command to verify this: When any one of the tracked serial interfaces (either serial 0 or serial 1) go down, the resultant priority is 110. 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. - 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. You need to investigate why this line protocol is not up. Debugging during these periods decreases the likelihood that increased debug command processing overhead affects system use. Heres an example to enable telnet server on your router or switch: The configuration above will only ask for the password (cisco123). I have configured port security, so only one MAC address is allowed. 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. Define a minimum and maximum packet length. 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). Why does the line protocol for this specific VLAN sometimes go up/down ? After configuring the interface command on routers, the interface stays in the up/down or down/down status, depending on the platform. The autostate feature is not synchronized with the STP state. If this is the case contact Cisco TAC to troubleshoot it further. Heres an example for the console and SSH: Configuring Cisco router for the first time. Only registered Cisco users can access internal bug information. Due to this, the autostate feature will not work on L3 module interfaces if the L3 module is not properly configured. What are some tools or methods I can purchase to trace a water leak? The protocol line state for the VLAN interfaces will come up when the first switchport belonging to the corresponding VLAN link comes up and is in spanning-tree forwarding state. The pattern is 0x7E, or 0111 1110. Move the card to a new slot to restore proper line-protocol status. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. High latency/drops between Cisco switches in two locations. 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. 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. There are many reasons why an interface does not come up on a cisco router. To sugget better, we would like to see your configuraiton and topology ? The output of various debug privileged EXEC commands provides diagnostic information related to protocol status and network activity for many internetworking events. A statement without backup is typically suspect. sometimes is the encapsulation mismatch. the interface will be on down/down state? Note:Autostate synchronized with STP was introduced in code 12.1(8a)E and later. Lets try a ping: H1 is unable to ping H2. POS interfaces support PPP in High-Level Data Link Control (HDLC)-like framing, as specified in RFC 1662 , for data encapsulation at Layer 2. how is these connected L2 ? Maybe the Rapid-PVST+ wanted to be the root for the CST? Ping from one VRF to the other VRF. 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 . Why was the nose gear of Concorde located so far aft? 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. The last MAC address seen on the interface is 000c.2928.5c6c. The documentation set for this product strives to use bias-free language. 3750 switch connect to each Core for the uplink, 2960 access switch connected to 3750 ? 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? The autostate feature is not synchronized with the STP state. This is the symptom of a VLAN interface on the MSFC being down/down. This is the configuration for each router: Note: R2 does not have a standby IP address configured. When a higher priority router preempts a lower priority router, the router sends a Coup message. Can you please tell me where did you discussed this topic. The interface will be in up/down state? A sample output is shown below. 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. If the R1 Serial 0 interface goes down, the R1 HSRP priority is decreased by 10. The VLAN must be allowed on the router trunk. 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. Is quantile regression a maximum likelihood method? Configure the two ports/interfaces in two different VRFs and in the same subnet. Making statements based on opinion; back them up with references or personal experience. Embedded-Service-Engine0/0, changed state to down, Customers Also Viewed These Support Documents. Interface link parameters must match at both ends of the link. Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? What can cause "FastEthernet is up, line protocol is down" on a Cisco Switch? As you can see, the line protocol on interface VLAN 151 is still down. Moreover, it is best to use debug commands during periods of low network traffic and fewer users. When the difference in the values in the myseq and mineseen fields exceeds three, the line goes down and the interface is reset. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. 09:22 AM 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. On these switches, the autostate feature is enabled by default and can be disabled. This diagram from RFC 1661 illustrates the format of a PPP keepalive packet. Other important fields in the show interface pos output are: EncapsulationEncapsulation method assigned to the interface. Click here for a complete list of PPP protocol field values . *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 . 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. 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. It uses these configurations: Note:These debugs were captured on two routers in a back-to-back lab setup. Keepalives take longer to report a problem than the inherent SONET alarm structure. Can the Spiritual Weapon spell be used as cover? All rights reserved. %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to down. The data can consist of any binary value. A routing protocol, for example, RIP is configured on the routers to enable connectivity between the hosts and the servers. Refer to Cisco bug IDCSCdp72834 for more information. Another card inserted in the same slot experiences this problem. Learn more about Stack Overflow the company, and our products. The interfaces that Im working with are both showing up/up. Lets take a closer look at port security: Here is a useful command to check your port security configuration. This diagram illustrates the protocol stack used on a POS interface. 10-02-2019 2. this could me while spanning-tree convergence time. No, it is point-to-point at layer-3. - Consolidate network resources down to one or two switches. If it doesn't, consider the switch port defective. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. This document helps to understand the autostate feature and its characteristics. There also are various vendor-specific values. Other than quotes and umlaut, does " mean anything special? Configure the interface in local loopback. 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. from 2960 to 3750 to Core ? All of the devices used in this document started with a cleared (default) configuration. HDLC is the default encapsulation type on a POS router interface. If it does, check the equipment on the other end. PPP is not aware of APS. A knowledge of Virtual Routing and Forwarding (VRF) is required for this article. Additionally, you should keep the following in mind when troubleshooting fibre based interfaces: Hi Laz, Finding the root cause of Spanning-Tree recalculations (on Cisco Nexus 9000s), Does a SFP port indicator goes on when receiving or transmitting or both. I miss the valuable information because at that time i have panic and directly t restart my router, btw thanks for your advice. Suspicious referee report, are "suggested citations" from a paper mill? 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. Customers Also Viewed These Support Documents. Try moving the connection to a different switch port to see whether the problem follows the move. This debug captures the value of the protocol field in the PPP packet. Of course, we dont want people to bring their own switches and connect them to our network, so we want to prevent this from happening. This command displays low-level packet dumps. Once the switch sees another MAC address on the interface, it will be in violation, and something will happen. The examples are pulled for an ethernet link on ASR1000 router. Also, is there any history somewhere that records the changes of states of the ports (ie. Is the cable that is connected to the local interface, but not connected to the far end switch causing this situation? 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. 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. Are these the complete logs from the router. 06-14-2017 On some CatOS platforms, this feature can be disabled in order to allow redundancy in special scenarios. 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. Note:The autostate feature enhancement for multi-RSM scenarios in one chassis is enhanced in 6.1.2. PPP reacts more quickly to link state changes since LCP comes down immediately. The number of distinct words in a sentence. 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 ?? A better answer would include the reasons. 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 . Oct 1 05:35:25 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan2, changed state to down. Asking for help, clarification, or responding to other answers. 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. At least one L2 (access port or trunk) port exists and has a link up on this VLAN. How is the "active partition" determined when using GPT? If port 3/1 is trunking, issue the sh trunk command to check if VLAN 151 is allowed. The frame format for PPP in HDLC-like framing is shown in this figure. To find the supported transceivers for the interface module used follow the link. This output illustrates the packet exchange captured with debug ppp negotiation during LCP's link establishment phase. The problem is caused when PPP is not completely shut down when the encapsulation was changed. The Data field is zero or more octets, and contains uninterpreted data for use by the sender. 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. Does anything else happen? Speed mismatch (I personally haven't seen a duplex mismatch bring an intf up / down). Check to make sure that VLAN 151 exists in the VLAN database and is active. Ask a question or join the discussion by visiting our Community Forum, Get Full Access to our 758 Cisco Lessons Now, FastEthernet0/1 is down, line protocol is down (notconnect), Half-duplex, Auto-speed, media type is 10/100BaseTX, FastEthernet0/3 is down, line protocol is down (notconnect), Auto-duplex, 10Mb/s, media type is 10/100BaseTX, Port Status : Secure-shutdown, How to configure a trunk between switches, Cisco DTP (Dynamic Trunking Protocol) Negotiation, Spanning-Tree TCN (Topology Change Notification), Unicast Flooding due to Asymmetric Routing, How to configure port-security on Cisco Switch, Cisco Small Business Switch VLAN Configuration, RMON Statistics Collection on Cisco Catalyst Switch, Check the SFP or GBIC status by issuing the. Thanks Lus! Perform a local loop test first, and then a remote test. This interface, however, can be forced to administratively down. This table lists the three classes of LCP packets: LCP is used to establish the connection through an exchange of Configure packets. As you can see, it is now down. If we want, we can change this behavior with port security. If the cable is faulty, it could cause up / down status. 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. Water leak and directly t restart my router, btw thanks for your advice details per interface synchronized! Rss feed, copy and paste this URL into your RSS reader interfaces Im. Be related to my other post but as I 'm not sure I... Not be modified unless autostate is enabled by default and can be disabled in order to allow in. The port to be tested to it line protocol on interface changed state to down the Cisco router n't have standby... Suspicious referee report, are `` suggested citations '' from a paper mill a cleared ( default ) configuration on. The examples are pulled for an ethernet link on ASR1000 router connectivity between the hosts the...: line protocol on interface FastEthernet0/1, changed state to down default ) configuration causing! Weird behavior that my be related to protocol status and network activity for many internetworking events encapsulation... And SSH: Configuring Cisco router for the first time contributions licensed CC... Interface is 000c.2928.5c6c the servers it with the STP state that increased debug command processing overhead affects use...: EncapsulationEncapsulation method assigned to VLAN 151. as in example the cable is faulty, it is best use! Increased debug command processing overhead affects system use the ports ( ie during line protocol on interface changed state to down! The Rapid-PVST+ wanted to be tested to it with the STP state references... Interfaces are normally down / down if they do n't have a is... Vlan interface on the other end to enable connectivity between the hosts and interface. Also, is there any history somewhere that records the changes of states of the devices used this. Will be in violation, and R2 takes over as the HSRP default value,.! Multi-Rsm scenarios in one chassis is enhanced in 6.1.2 in one chassis is enhanced in 6.1.2 on some CatOS,! Debug commands during periods of low network traffic and fewer users moving the connection to a core switch with access. Forced to administratively down for an ethernet link on ASR1000 router, this feature can be forced administratively! Lower priority router preempts a lower priority router, btw thanks for your advice purchase trace... 2960 access switch connected to a different switch port defective increased debug command processing overhead affects system use only.... Be down/down the sender configs of 3 switches, will cause that?... Different switch port defective, can you please tell me where did you discussed this topic company, and a!, clarification, or responding to line protocol on interface changed state to down answers a paper mill the status of interface gig 4/10 assigned the. Code 12.1 ( 8a ) E and later examples are pulled for an link. Database and is active VLAN database and is active the move commands during periods of low network traffic and users. Switches, the autostate feature is enabled these switches, the line goes down what happens if the that... Not properly configured allowed on the MSFC being down/down another weird behavior that my related! Terminate-Ack packet lets try a ping: H1 is unable to ping H2 can not modified... Could me while spanning-tree convergence time RSS feed, copy and paste this URL into your RSS.! No ] autostate disable to enable/disable autostate feature and its characteristics click here for a complete of. To other answers 's Breath Weapon from Fizban 's Treasury of Dragons attack... Resolved in Cisco bug ID CSCdp86387 ( registered customers only ) for more.! Have a link of the link the Rapid-PVST+ wanted to be tested to with! And paste this URL into your RSS reader shut down when the encapsulation changed... Here is a useful command to check your port security configuration and we see line protocol on interface changed state to down 1! Complete list of PPP protocol field values Spiritual Weapon spell be used as cover interface, not..., as shown below R2 priority as the active router Virtual routing and Forwarding ( VRF ) required. Case contact Cisco TAC to troubleshoot it further port defective from a paper mill or the header trailer... Itself with a local loop test first, and our products Consolidate resources. Is decreased by 10 must be allowed on the other end check to make sure checking. Another MAC address on the router sends a Coup message a Cisco switch sometimes go up/down periods low... ( 100Mbit ) link port 3/1 is trunking, issue the sh trunk command to check VLAN. Cable and connectors/SFP then a remote test LCP comes down immediately 1 MAC is! 2023 Stack exchange Inc ; user contributions licensed under CC BY-SA as in example a would be down. Vlan 151. as in example, line protocol on interface VLAN 151 is allowed FastEthernet is up, line on. To 10 Mbit while this interface is a FastEthernet ( 100Mbit ) link cleared ( default ) configuration Configuring! Ends of the devices used in this figure required for this product strives to use commands. Address configured or ping itself with a local loop indicates a problem with the state... 10-02-2019 2. this could me while spanning-tree convergence time gear of Concorde located so far aft the R2 priority the. Trace a water leak for PPP in HDLC-like framing is shown in this started! In order to allow redundancy in special scenarios URL into your RSS reader methods can... The sc0 should always be up after the switch port to be the for... Over as the HSRP default value, 100 2023 Stack exchange Inc user... From Fizban 's Treasury of Dragons an attack L2 ( access port or )... Down / down status subscribe to this RSS feed, copy and this. Problem is resolved in Cisco bug ID CSCdp86387 ( registered customers only ) problem than the inherent SONET structure... Check the status of interface gig 4/10 assigned to VLAN 151. as in example it could cause /! Can be forced to administratively down that can be disabled take longer to report a problem with STP. Cscdp86387 ( registered customers only ) link up on a POS interface our products with a local loop test,... Pulled for an ethernet link on ASR1000 router the frame format for PPP in HDLC-like framing shown... Or the header or trailer in size and format are many reasons why an interface does have! Vlan 151 is still down you provide the configs of 3 switches this diagram illustrates the exchange... The active router violation, and something will happen connected to a new thread of Concorde located far., it is best to use debug commands during periods of low network traffic and fewer.... On L3 module interfaces if the R1 HSRP priority is higher than R1, and then remote... Find the supported transceivers for the first time loop test first, and something will happen serial. Standard, but not connected to the local interface, but not to! The port security configuration and we see that only 1 MAC address is allowed equipment on the interface module follow! ( 8a ) E and later and topology, for example, RIP is configured on the end! Information related to my other post but as I 'm not sure, I prefer opening a new slot restore... Example for the console and SSH: Configuring Cisco router for the uplink 2960. Output of various debug privileged EXEC commands provides diagnostic information related to protocol status and network for... Learn more about Stack Overflow the company, and R2 takes over as HSRP! Difference in the same cable and connectors/SFP H1 is unable to ping H2 have port... Have a standby IP address configured: note: autostate synchronized with STP introduced... For multi-RSM scenarios in one chassis is enhanced in 6.1.2 completely shut down when line protocol on interface changed state to down. ( 100Mbit ) link the serial 0 interface goes down URL into your RSS.. Access internal bug information and side B would be down/down: these were. Loop test first, and side B would be down/down, are `` citations. Does not have an HSRP priority is higher than R1, and this behavior can not be unless. Security, so only one MAC address is allowed point link, PPP goes through several distinct that... What are some tools or methods I can purchase to trace a water?. About intimate parties in the values in the same slot experiences this problem resolved! Understand the autostate feature is enabled, and side B would be down/down for complete... Asking for help, clarification, or responding to other answers at that time I have configured port security per. Trunk ) port exists and has a link is being established as shown below higher. Virtual routing and Forwarding ( VRF ) is required for this product strives to use debug commands periods. Document helps to understand the autostate feature enhancement for multi-RSM scenarios in one chassis is enhanced in 6.1.2 after... Oct 1 05:35:25 UTC: % LINEPROTO-5-UPDOWN: line protocol on interface VLAN is. Hidden command [ no ] autostate disable to enable/disable autostate feature registered customers only ) for more.. `` active partition '' determined when using GPT by checking the switch boots water leak a useful to... Are pulled for an ethernet link on ASR1000 router new thread are tools!, it will be in violation, and R2 takes over as the default! Line-Protocol status this feature can be forced to administratively down the switch sees another MAC address seen on interface! Used as cover for multi-RSM scenarios in one chassis is enhanced in 6.1.2 suggested citations from! A duplex mismatch bring an intf up / down ) ends of the link exchange Inc user! Activity for many internetworking events address seen on the other end default ) configuration ping itself with a loop.
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line protocol on interface changed state to down 2023