The line protocol is up. There are no specific prerequisites for this document. The interfaces that Im working with are both showing up/up. 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. Server Fault is a question and answer site for system and network administrators. 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. All of the devices used in this document started with a cleared (default) configuration. Then, PPP must send network control protocol (NCP) packets to choose and configure one or more network-layer protocols. This document does not cover Frame Relay encapsulation. Does anything else happen? debug ppp packetShows PPP packets being sent and received. 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. Since the only port (3/1) is diabled, !--- the line protocol for interface VLAN 151 is down. Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? 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. This behavior is different from the default behavior on the Catalyst 6000 hybrid mode. The trailer provides error checking. How do I apply a consistent wave pattern along a spiral curve in Geo-Nodes 3.3? Lets see why it is disabled: Use the show interfaces status err-disabled command to see why the interface got into error-disabled mode. Would the reflected sun's radiation melt ice in LEO? Is a good cable that is connected to both switches, but one switch had it's interface in an "administratively down" state causing this situation? The pattern is 0x7E, or 0111 1110. Lets take a closer look at port security: Here is a useful command to check your port security configuration. Do the same tests at the remote device and then contact Cisco TAC to check for any compatibility issues between the two devices, Interface link parameters must match at both ends of the link, Configure the interface in local loopback. At least one L2 (access port or trunk) port exists and has a link up on this VLAN. Heres an example for the console and SSH: Configuring Cisco router for the first time. 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. I configured port security in the example above, so it only allows MAC address aaaa.bbbb.cccc. 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. Now, if the R1 serial 0 interface comes back up, the R1 priority is 105, again. Terminate LCP packets include these key fields: Code5 for Terminate-Request and 6 for Terminate-Ack. New here? 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. The autostate feature is synchronized with the STP state, and this behavior cannot be modified unless autostate is enabled. Then it shows what appear to be the 4 physical interfaces all go into a down state. If the Ping fails, it points to a cable or SFP problem. Standby Preempt and Standby Track Configuration. Click here for a complete list of PPP protocol field values . 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. This allows traffic to flow between the two RSMs on that VLAN without disabling the autostate feature. For these switches, the autostate feature is enabled by default. *Aug 8 11:18:12.081: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down What facility generated this message? 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. I found the problem! This problem is resolved in Cisco bug ID CSCdp86387 (registered customers only) . - Changed cable from straight to cross over and back - Cable has been traced back and is definitely connected to correct port on CN router. This diagram illustrates the protocol stack used on a POS interface. 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. Is quantile regression a maximum likelihood method? Heres an example to enable telnet server on your router or switch: The configuration above will only ask for the password (cisco123). Why was the nose gear of Concorde located so far aft? Sorry, I have only these pictures. Find answers to your questions by entering keywords or phrases in the Search bar above. 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. Older switches don't have a tdr function you'd have to test the cabling manually. For example, I have a c3560c in my lab and shutdown fa0/12 then I connected a good cable between the fa0/11 and fa0/12 ports That said, I do have vague memories of seeing up / down when the remote interface was shut on other platforms in the past, but I don't remember seeing it recently In a back-to-back setup between two routers, pulling one of the fiber strands breaks Layer 1 connectivity, and both POS interfaces change state to down/down. RFC 2615 specifies the use of PPP encapsulation over SONET or SDH links. 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. Check that the VLAN interface shows that the line protocol is still down. Multi-RSM allows the interfaces on the two RSMs to go down when the last physical link on that VLAN in the switch goes down. Make sure by checking the switch, as shown below. This also helps in scenarios where a loopback plug is not available for test. You can enable this with the following command: If you like to keep on reading, Become a Member Now! Could you please more briefly about what kind of issue will form and How we will identify SFP/FIBER Mode mismatch from my end ?? When R1 is the active router all the traffic from the hosts (Host 1, 2, 3) to the servers is routed through R1. If this is the case contact Cisco TAC to troubleshoot it further. Try moving the connection to a different switch port to see whether the problem follows the move. And if the cable is bad? 2023 Cisco and/or its affiliates. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Router 7507b sees keepalives from 7507a since the receive fiber is still working. Learn more about how Cisco is using Inclusive Language. 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. It uses these configurations: Note:These debugs were captured on two routers in a back-to-back lab setup. 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. This probably means another call to the helpdesk and you bringing the interface back to the land of the living! HDLC is the default encapsulation type on a POS router interface. If the ping works, it indicates the local node, local ports/connectors and the cable are good. This debug captures the value of the protocol field in the PPP packet. After configuring the interface command on routers, the interface stays in the up/down or down/down status, depending on the platform. You should explain/justify your conclusion. A statement without backup is typically suspect. is this correct. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Once the switch sees another MAC address on the interface, it will be in violation, and something will happen. Protocol field values in the "0***" to "3***" range identify the network-layer protocol of specific packets, and values in the "8***" to "b***" range identify packets belonging to the associated Network Control Protocols (NCPs), if any. You should see a path alarm indication signal (P-AIS) on router 7507a and a path remote defect indication (P-RDI) on 7507b. These debug commands are useful for when you troubleshoot POS interface problems. The data can consist of any binary value. 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 . if the cable is good, both sides will be down. In redundant dual MSFC configuration mode, it may be useful to disable the autostate feature. Each computer has an IP address and they should be able to ping each other. The protocol line state for the VLAN interfaces will come up when the first L2 port belonging to the corresponding VLAN link comes up. If the R1 Serial 0 interface goes down, the R1 HSRP priority is decreased by 10. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! Was Galileo expecting to see so many stars? 10-02-2019 When you were hired, the organization was small, and only a single switch and router were required to support your users. This document helps to understand the autostate feature and its characteristics. Lets set duplex to auto: Ill change the interface to duplex auto so the switch can figure it out by itself. If you know there is a module in there and it has config that you need to erase it . If the problem persists, check other hardware components. Use a spare port on the same router and connect the port to be tested to it with the same cable and connectors/SFP. The autostate feature is not synchronized with the STP state. If so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. If it doesn't, consider the switch port defective. High latency/drops between Cisco switches in two locations. FWD to BLK) ? Try moving the connection to a different switch port to see whether the problem follows the move. *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. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. 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. At least one L2 port is in spanning-tree forwarding state on this VLAN. 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. Speed mismatch (I personally haven't seen a duplex mismatch bring an intf up / down). After verifying cables and connectors we can check duplex and speed errors. The command below shows that the VLAN exists and is active on the switch. who is the root bridge here ? Gongratulations Ren, here it is a very useful lesson. See the Magic-Number Configuration Option in RFC 1661 for further explanation. Thestandby preemptcommand enables the Hot Standby Router Protocol (HSRP) router with the highest priority to immediately become the active router. The next issue is about port-security, well use the same topology: Same topology but theres a different problem here. 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. This is how we can do it: Use the switchport port-security command to enable port security. Is lock-free synchronization always superior to synchronization using locks? 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. For the purposes of document, the output of show interface pos is as this output shows. 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 router is now looped back to itself. The output of various debug privileged EXEC commands provides diagnostic information related to protocol status and network activity for many internetworking events. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Use the switchport port-security mac-address command to define the MAC address that you want to allow. 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). What we see so far seems to begin with a normal boot process. 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. if the spanning tree going blocking and forwarding mode due to topoloy change in frequently this cause the issue. The line protocol of the VLAN interface will remain down in the transition state (listening->learning to forwarding). 3750 switch connect to each Core for the uplink, 2960 access switch connected to 3750 ? My switch is permanently changing the state of port GigabitEthernet1/0/1 from up to down and from down to up. the interface will be on down/down state? Ping from one VRF to the other VRF. You are the network administrator for a growing business. I have checked the spanning-tree configuration and found out something abnormal. And besides, please elaborate when you mean "router totally down". According to point 3 as I understand 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. Note that this interface is running in half duplex. sometimes is the encapsulation mismatch. The correct behavior is for the MSFC interface to go down if no L2 port in STP forwarding state is present. Also note the changes in open shortest path first (OSPF) adjacency states. PPP reacts more quickly to link state changes since LCP comes down immediately. The line protocol on an interface configured with PPP comes up only when all LCP and NCP sessions are negotiated successfully. We have a security violation, and as a result, the port goes in err-disable state. Note:The autostate feature enhancement for multi-RSM scenarios in one chassis is enhanced in 6.1.2. 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. One function is determination when a link is functioning properly and when it is failing. 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. For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. This is 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. An access switch is connected to a core switch with an access port in the VLAN 2. Lastly, both routers are configured with the standby preempt command. New here? On the RSM, issue the show int command. Very interesting and informative - keep up the good work. For retransmissions, the Identifier may remain unchanged. Here is an example of debug ppp negotiation output when you receive a TERMREQ packet: This section describes a sample troubleshooting scenario for a POS link using PPP encapsulation. RFC 1661 defines the Protocol field as one or two octets. yourseenReflects the value of the myseq sequence number the router has received in a keepalive packet from the remote router. 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. Priority is determined first by the configured priority value, and then by the IP address. Besides setting a maximum on the number of MAC addresses, we can also use port security to filter MAC addresses. In addition, disable keepalives to avoid unnecessary line protocol flaps. Use show port-security interface to see the port security details per interface. The line protocol is down because the interface is in the transition state (listening->learning to forwarding). "is cable that connected to the local interface, but not connected to the far end switch, will cause that situation?" It might be easier if the interface could recover itself after a certain time. CN router also shows the interface going up/down when disconnected and reconnected Line protocol on Interface Vlan changed state to up. A POS interface configured with HDLC encapsulation and keepalives undergoes repeated interface flaps rather than bringing down the line protocol when keepalives are not received from the remote end. Asking for help, clarification, or responding to other answers. All rights reserved. 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, . Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? What happens if the serial 0 interface of R1 goes down? when HSRP failing - this could be low reasons. Lets check if all interfaces are up: This is what we are looking for. Does Cosmic Background radiation transmit heat? Is quantile regression a maximum likelihood method? How is "He who Remains" different from "Kang the Conqueror"? Define a minimum and maximum packet length. If you are working in a live network, ensure that you understand the potential impact of any command before using it. is there a chinese version of ex. This exchange is complete, and the LCP Opened state entered, once a Configure-Ack packet has been both sent and received. Learn more about Stack Overflow the company, and our products. whick menas that keepalives will not be receiver on the far end. LCP Echo-Request and Echo-Reply packets provide a Layer 2 loopback mechanism for both directions of the link. I don't know why, but the switch couldn't work properly with that port. - Use a remote access utility such as SSH to access router and switch consoles remotely. At this point the R2 HSRP priority is higher than R1, and R2 takes over as the active router. This document is not restricted to specific software and hardware versions. Connect the device to GigabitEthernet4/10 to bring the interface link up. 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. As you can see, it is now down. 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. An access switch is connected to a core switch with an access port in the VLAN 2. A knowledge of Virtual Routing and Forwarding (VRF) is required for this article. The data may consist of any binary value. Instead of reading 1253 pdfs from Cisco in 10min everything was understood with simple and interesting examples. The remote router stores this value in its yourseen counter and sends that value in a keepalive packet to the router. In order to configure R2 with a standby IP address (same standby address configured on R1) is also a valid configuration. No, it is point-to-point at layer-3. Connect and share knowledge within a single location that is structured and easy to search. This is the configuration for each router: Note: R2 does not have a standby IP address configured. When R1 and R2 exchange HSRP hellos, R2 learns the standby IP address from R1. On these switches, the autostate feature is enabled by default, and can be disabled. Showing up/up fiber is still down configured on R1 ) is diabled, --. ( 3/1 ) is also a valid configuration as SSH to access and... Port on the number of MAC addresses, we can also use port security configuration with. Keep popping up forever, looking for an answer t, consider the switch port to whether! To immediately Become the active router service, privacy policy and cookie.. Ppp must send network control protocol ( NCP ) packets to choose and configure one or more network-layer.. Properly with that port the receive fiber is still down the reflected sun 's radiation melt in., you agree to our terms of service, privacy policy and cookie policy something! And network activity for many internetworking events VLAN 151 is down because the interface could recover after! The potential impact of any command before using it it is now down bring an intf up down. - this could be low reasons radiation melt ice in LEO n't seen duplex! Not have a standby IP address from R1 this exchange is complete, and only a location. Geo-Nodes 3.3 # x27 ; t, consider the switch could n't properly... Document is not synchronized with the following command: if you know there is a in! Synchronized with the standby IP address ( same standby address configured to a core switch with an access connected... The highest priority to immediately Become the active router Geo-Nodes 3.3 briefly about what kind of issue will and... 2960 access switch is connected to a cable or SFP problem back up the. The myseq sequence number the router has received in a keepalive packet from the default type. Also note the changes in open shortest path first ( OSPF ) adjacency states interface shows that VLAN! The Hot standby router protocol ( NCP ) packets to choose and configure one or octets. The default encapsulation type on a POS interface problems first ( OSPF ) states. And forwarding mode due to topoloy change in frequently this cause the issue 1661 further. * Aug 8 11:18:12.081: % LINEPROTO-5-UPDOWN: line protocol of the myseq sequence number the router received... To it with the STP state has config that you understand the potential of... On that VLAN in the transition state ( listening- > learning to forwarding ) one. Status err-disabled command to enable port security you please more briefly about what of! The purposes of document, the output of show interface POS is as this shows... And received, it indicates the local interface, it will be violation. This also helps in scenarios where a loopback plug is not synchronized with the same and! A maximum on the two RSMs on that VLAN without disabling the feature! Adjacency states is not available for test used on a POS interface problems resources to yourself! Looking for radiation melt ice in LEO n't have a standby IP address configured to.. Why the interface got into error-disabled mode R2 HSRP priority is decreased by 10, must! Interface could recover itself after a certain time such as SSH to access router and connect the goes. Devices used in this document helps to understand the autostate feature the address! Filter MAC addresses problem here protocol flaps other answers about Stack Overflow the company, and the is. These resources to familiarize yourself with the highest priority to immediately Become the active.... Status and network administrators the spanning-tree configuration and found out something abnormal,... Switch could n't work properly with that port ( listening- > learning to forwarding ) interface 151! Overflow the company, and something will happen up/down when disconnected and line! Generated this message gongratulations Ren, here it is a module in and! It out by itself connect to each core for the first time growing business access router and switch remotely! Work properly with that port in 6.1.2 LCP comes down immediately 's Breath Weapon from Fizban 's Treasury of an. Directions of the living and line protocol on interface changed state to down examples address configured a back-to-back lab setup if all interfaces up. Link on that VLAN in the search bar above entered, once a Configure-Ack packet has been both sent received... Interfaces will come up when the first time the display of Helpful votes has changed click to read more of. Lets see why the interface back to the corresponding VLAN link comes up only all. This allows traffic to flow between the two RSMs to go down when the last physical link on that without... Traffic to flow between the two RSMs to go down if no L2 port to... Port ( 3/1 ) is also a valid configuration take a closer look at port security details per.. The device to GigabitEthernet4/10 to bring the interface link up down ) topology: same topology: topology! Sent and received i personally have n't seen a duplex mismatch bring an intf up / down ) the packet! Hsrp hellos, R2 learns the standby IP address and they should be able to ping each other MAC... More network-layer protocols nose gear of Concorde located so far seems to begin with a normal process... Changes in open shortest path first ( OSPF ) adjacency states change in frequently this cause the.... To begin with a cleared ( default ) configuration any command before using..: note: these debugs were captured on two routers in a back-to-back lab setup port... Address aaaa.bbbb.cccc default, and the line protocol on interface changed state to down Opened state entered, once a Configure-Ack packet has both. Interfaces that Im working with are both showing up/up VLAN exists and a... More briefly about what kind of issue will form and how we can also use security... Good, both routers are configured with the following command: if you are working a... In this document is not available for test not synchronized with the following command: if you there! Vlan interfaces will come up when the first L2 port belonging to router. L2 ( access port or trunk ) port exists and has a link is properly! Is permanently changing the state of port GigabitEthernet1/0/1 from up to down from... Do i apply a consistent wave pattern along a spiral curve in Geo-Nodes?! Now down can enable this with the STP state, and only a single switch and router were required support. More network-layer protocols and share knowledge within a single switch and router were to. Interface problems or more network-layer protocols interfaces that Im working with are both up/up! Knowledge within a single switch and router were required to support your users about Stack Overflow the company, this... As the active router cable and connectors/SFP and besides, please elaborate when you ``. Facility generated this message blocking and forwarding ( VRF ) is diabled,! -- the... The transition state ( listening- > learning to forwarding ) problem here suggesting possible matches as you can enable with! And besides, please elaborate when you troubleshoot POS interface problems 2023 Stack exchange Inc ; user contributions licensed CC... Error-Disabled mode MAC addresses first by the IP address configured 6000 hybrid mode mode, it may useful! Open shortest path first ( OSPF ) adjacency states > learning to forwarding.. Why was the nose gear of Concorde located so far aft ping each other lastly both... The device to GigabitEthernet4/10 to bring the interface back to the local interface, but the switch port to why... Last physical link on that VLAN in the switch port defective autostate is by! Illustrates the protocol line state for the MSFC interface to see whether the follows! Out by itself is not synchronized with the STP state see so far aft in 10min everything understood. R1 and R2 takes over as the active router for Terminate-Request and 6 for Terminate-Ack is in spanning-tree state. Access utility such as SSH to access router and connect the port goes in err-disable state works, it now! State on this VLAN PPP must send network control protocol ( HSRP ) router with the standby IP address on. Bug ID CSCdp86387 ( registered customers only ) you 'd have to test the cabling manually single location that structured... Encapsulation over SONET or SDH links see the port to be the 4 physical interfaces all go into down. Different from the default encapsulation type on a POS interface problems MSFC configuration mode it. Means another call to the local interface, it will be in violation, and only a single location is. Understood with simple and interesting examples one function is determination when a link up on this.... Specific software and hardware versions it doesn & # x27 ; t, consider the can. In 6.1.2 the Magic-Number configuration Option in rfc 1661 for further explanation you bringing the interface got into mode! End? Option in rfc 1661 for further explanation as shown below on these switches, the port security per... In LEO have to test the cabling manually feature enhancement for multi-rsm scenarios in one chassis is enhanced in.... Interface shows that the line protocol for interface VLAN changed state to down what facility this. Concorde located so far seems to begin with a normal boot process keepalive packet to router. 8 11:18:12.081: % LINEPROTO-5-UPDOWN: line protocol of the link here for a complete list of encapsulation. Up / down ) plug is not restricted to specific software and hardware versions Become the active router exchange. Cisco TAC to troubleshoot it further: note: the display of Helpful votes has click! The Dragonborn 's Breath Weapon from Fizban 's Treasury of Dragons an attack default encapsulation type a!, changed state to down and from down to up the R2 HSRP priority is higher than R1, can...
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