line protocol on interface changed state to downdysautonomia scholarships

Check the status of port 3/1 assigned to VLAN 15. This debug captures the value of the protocol field in the PPP packet. Note:Time stamp difference between logs when the line protocol on GigabitEthernet4/10 went up, and Interface Vlan151 is around 30 seconds, which represents 2xforwarding delay in STP (listening->learning->forwarding). Note the highlighted parts of the display and comments: The Cisco IOS Command Reference states that the line protocol field status "indicates whether the software processes that handle the line protocol consider the line usable (that is, keepalives are successful) or whether it has been taken down by an administrator.". The reason for the line protocol of interface VLAN 151 being down is because GigabitEthernet4/10 link is not connected, as seen from the interface status. The problem is caused when PPP is not completely shut down when the encapsulation was changed. At least one L2 port is in spanning-tree forwarding state on this VLAN. The interface will be in up/down state? 10:55 PM RFC 2615 specifies the use of PPP encapsulation over SONET or SDH links. The frame format for PPP in HDLC-like framing is shown in this figure. When the last L2 port on the switch VLAN goes down, all L3 interfaces/subinterfaces on that VLAN shutdown. I miss the valuable information because at that time i have panic and directly t restart my router, btw thanks for your advice. 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. 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. Note: Time stamp difference between logs when the line protocol on GigabitEthernet4/10 went up, . All rights reserved. I wonder what can cause the first line output of the command show interfaces to be: FastEthernet is up, line protocol is down. Because no decrement value is specified in the standby track command, the HSRP priority is decremented by the default value of 10 when the tracked interface goes down. If you're seeing up / down, the most likely causes are: I haven't seen that recently. Avoid configuring APS on a POS interface with PPP encapsulation. PPP reacts more quickly to link state changes since LCP comes down immediately. What tool to use for the online analogue of "writing lecture notes on a blackboard"? *Mar 1 01:54:39.699: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to up. 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. Ethernet0 is administratively down, line protocol is down: This output indicates that a local interface has been manually shut down using the shutdown command. 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. debug ppp negotiationShows PPP packets transmitted during PPP startup, where PPP options are negotiated. Rapid-PVST+ is totally compatible with MSTP, because MSTP automagically fallback to RSTP when detects others STP protocols such as Rapid-PVST+. Learn more about how Cisco is using Inclusive Language. Share Improve this answer There is one exception for the VLAN assigned to the management interface (sc0) on the switch. 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. POS interfaces support PPP in High-Level Data Link Control (HDLC)-like framing, as specified in RFC 1662 , for data encapsulation at Layer 2. Regarding to the second question: What if the cable is good? sometimes is the encapsulation mismatch. Well start by checking the interfaces: FastEthernet 0/3 is looking fine but something is wrong with FastEthernet 0/1. So I have a good intuition that the issues comes from here. - Use a remote access utility such as SSH to access router and switch consoles remotely. High latency/drops between Cisco switches in two locations. For this reason, use debug commands only to troubleshoot specific problems or during troubleshooting sessions with Cisco technical support staff. Side A would be admin down, and side B would be down/down. It only takes a minute to sign up. What are some tools or methods I can purchase to trace a water leak? Use the switchport port-security mac-address command to define the MAC address that you want to allow. What can I do? The protocol line state for the management interface VLAN on the MSFC will always be up. Does anything else happen? Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? 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. You should see a path alarm indication signal (P-AIS) on router 7507a and a path remote defect indication (P-RDI) on 7507b. Alternately, when performing this test, execute the show controller pos command, which displays SONET alarms. 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. Its telling me port-security is the reason. And besides, please elaborate when you mean "router totally down". Glad to hear it was useful to you. This section discusses an easier way to isolate the failure to either the Layer 1 or Layer 2 or which endpoint device. 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. To learn more, see our tips on writing great answers. is there a chinese version of ex. 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 ?? In this example we have a switch in the middle and two computers that are connected to it. Start by replacing the cable connected to the port with a new one. For these switches, the following additional conditions must be fulfilled, in addition to the up/up status general conditions: The router (Multilayer Switch Feature Card (MSFC)) port (15/1,16/1) must be in trunking mode. In the question, the interface is layer-1, and the line protocol is layer-2. The end of the field is indicated by the Length. Making statements based on opinion; back them up with references or personal experience. 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. - Consolidate network resources down to one or two switches. - edited 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. For these switches, the autostate feature is enabled by default. 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. Keepalives are disabled automatically on most POS router hardware. "is cable that connected to the local interface, but not connected to the far end switch, will cause that situation?" Start by replacing the cable connected to the port with a new one. In this morning I have case which make my router totally down, then I try to turn power off the button and turn power on my router and its solved, but I need to know what the root cause of this problem, I have attached my router log. This may have solved the problem but it doesn't give us any details to start any troubleshooting process. 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. Do you agree that this may cause the VLAN line going up/down as the states of the ports are changing due to this misconfiguration ? 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. Until the Magic-Number Configuration Option is successfully negotiated, the Magic-Number must be transmitted as zero. Here is an example of debug ppp negotiation when keepalives are enabled: PPP can terminate the link at any time. I have configured port security, so only one MAC address is allowed. 09:22 AM By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. When a higher priority router preempts a lower priority router, the router sends a Coup message. this can only confirm based on some more inputs. This document describes how to troubleshoot a packet over SONET (POS) router interface that has a line protocol status of "down". 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 documentation set for this product strives to use bias-free language. The best answers are voted up and rise to the top, Not the answer you're looking for? I found the problem! To subscribe to this RSS feed, copy and paste this URL into your RSS reader. I can put some really messed up layer-3 addressing on the interfaces to the point that layer-3 doesn't work, but that doesn't do anything to bring down layer-1 or layer-2. If this is the case contact Cisco TAC to troubleshoot it further. (Refer to the APS Technology Support Page for more information.). Line Protocol Is Down With PPP RFC 1661 defines PPP as a protocol. - Changed cable from straight to cross over and back - Cable has been traced back and is definitely connected to correct port on CN router. %LINEPROTO. Note:Change the encapsulation from PPP to HDLC when you use loopbacks. Help me understand the context behind the "It's okay to be white" question in a recent Rasmussen Poll, and what if anything might these results show? 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. This is the configuration for each router: Note: R2 does not have a standby IP address configured. At this point the R2 HSRP priority is higher than R1, and R2 takes over as the active router. RFC 1661 defines the Protocol field as one or two octets. VLAN trunking between Juniper EX -> Cisco Catalyst -> and Cisco Router. Instead R1 would have remained the active router. Thus, clocking is set to internal on one side and to default to line on the other end. HDLC is the default encapsulation type on a POS router interface. The data may consist of any binary value. You should explain/justify your conclusion. 10-02-2019 It might be easier if the interface could recover itself after a certain time. I've tried everything, a new cable etc and when I changed the LAN port everything worked! The router VLAN interfaces have to fulfill the following general conditions to be up/up: VLAN exists and is in active status on the switch VLAN database. Gongratulations Ren, here it is a very useful lesson. If not, what would cause an interface to be in an up,down state? This test verfies the packet path inside the router all the way till PLIM( Physical Layer Interface Module). 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. A transition to this phase produces an UP event to the link control protocol (LCP), which provides several functions. However, although closely related, PPP and HDLC are not the same, and different debug commands are used to troubleshoot line protocol problems. Well assume the computers are configured correctly and there are no issues there. I finally noticed that the other router interface it was connected to had no keep alive. When you were hired, the organization was small, and only a single switch and router were required to support your users. This phrase has several connotation. In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. 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. 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. 15 more replies! Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. However the interface exists even if the module isn't present. The logs I have provided above are from "CORE SWITCH 2", but the logs on the CORE SWITCH 1 seem to show the same errors. PPP is not aware of APS. - Use syslog to implement centralized logging. LCP uses Terminate packets to close the link. Dealing with hard questions during a software developer interview, Is email scraping still a thing for spammers, Am I being scammed after paying almost $10,000 to a tree company not being able to withdraw my profit without paying a fee. who is the root bridge here ? Make sure by checking the switch, as shown below. The state of R1 is active and the state of R2 is standby. Is quantile regression a maximum likelihood method? This document discusses why this happens, and how the L3 and L2 interfaces interact with each other in the control plane after being activated. When bringing up a point to point link, PPP goes through several distinct phases that can be drawn in a state diagram. 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. Connect the device to GigabitEthernet4/10 to bring the interface link up. Let's take a closer look at port security: Heres what you will see: We have a security violation, and as a result, the port goes in err-disable state. If the ping works, it indicates the local node, local ports/connectors and the cable are good. The standby track command allows you to specify another interface on the router for the HSRP process to monitor in order to alter the HSRP priority for a given group. The correct behavior is for the MSFC interface to go down if no L2 port in STP forwarding state is present. If the cable is faulty, it could cause up / down status. 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. The router is now looped back to itself. Switch interfaces are layer-2 interfaces, but if you can address it, then you have enabled layer-3 and it is a router interface. This is intentional in order to demonstrate that this is a valid configuration. Refer to Troubleshooting Serial Line Problems for more information. 2023 Cisco and/or its affiliates. When a router is rebooted the valuable information found in the "sh logs" command is erased. This is the symptom of a VLAN interface being in up/down status. 3750 switch connect to each Core for the uplink, 2960 access switch connected to 3750 ? 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). We have a security violation, and as a result, the port goes in err-disable state. Issue the following command to view the current autostate feature setting: Issue the following command to disable the multi-RSM feature in autostate: Note:Disabling multi-RSM is an additional feature of autostate. Corgon-6000# Mar 11 12:11:23.406: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan151, changed state to up. Perform a local loop test first, and then a remote test. I wonder what can cause that the first line output of the command "show interfaces" will be: "fastEthernet is up, line protocol is down". You need to verify spanning-tree port status on the L2 port (should be forwarding). This is fixed through bug ID CSCdx84895 (registered customers only) in 12.1.13E and later releases. if the cable is good, both sides will be down. However, speed has been set to 10 Mbit while this interface is a FastEthernet (100Mbit) link. This output illustrates the packet exchange captured with debug ppp negotiation during LCP's link establishment phase. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. All rights reserved. Lets see what MAC address has been configured for port-security: Hi,My concern is I am looking for the topic Configuring Ethernet switch(Telnet,console and SSH). This means that another HSRP router with higher priority can become the active router if that router has the standby preempt enabled. 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 Interface FastEthernet0/0, changed state to up *Mar 1 00:07:24.539: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0 . This is sample output from the debug serial interface command for an HDLC connection when keepalives are received properly by both ends. Learn more about how Cisco is using Inclusive Language. Jordan's line about intimate parties in The Great Gatsby? In contrast, HDLC must time out the keepalives. Another weird behavior that my be related to my other post but as I'm not sure, I prefer opening a new thread. Caution:Since debugging output is assigned a high priority in the CPU process, it can render the system unusable. 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. Line protocol on Interface Vlan changed state to up. IP addressing, at layer-3, does not affect the layer-1/2. On some CatOS platforms, this feature can be disabled in order to allow redundancy in special scenarios. 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. Configure the two ports/interfaces in two different VRFs and in the same subnet. All of the devices used in this document started with a cleared (default) configuration. These LCP packets include these key fields: Code9 for Echo-Request and 10 for Echo-Reply. Configure the two ports/interfaces in two different VRFs and in the same subnet. 2. this could me while spanning-tree convergence time. 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. As a result, our Cisco switch will learn the MAC address of H1 and H2 on its FastEthernet 0/1 interface. Alternatively, you can post and accept your own answer. When R1 and R2 exchange HSRP hellos, R2 learns the standby IP address from R1. This interface, however, can be forced to administratively down. Why was the nose gear of Concorde located so far aft? Does Cosmic Background radiation transmit heat? To sugget better, we would like to see your configuraiton and topology ? The interfaces that Im working with are both showing up/up. If the Ping fails, it points to a cable or SFP problem. This document does not cover Frame Relay encapsulation. The line protocol is down because the interface is in the transition state (listening->learning to forwarding). No, it is point-to-point at layer-3. Make sure that at least one L2 port is in spanning-tree forwarding state on this VLAN. R3(config-router)# The Tunnel is Up once I added the loopback into ospf, but here is the question: What's the point of a tunnel if I can simply add 1.1.1.1 and 3.3.3.3 into ospf area 0 ? Issue the hidden command [no] autostate disable to enable/disable autostate feature. Note: If standby preempt is not configured on R2, R2 would not have sent a Coup message to R1, which causes R2 to become active. The information presented in this document was created from devices in a specific lab environment. 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. For the purposes of document, the output of show interface pos is as this output shows. How to troubleshoot? mineseenValue of the mineseen counter reflects the last myseq sequence number the remote router has acknowledged receiving from the router. 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. Protocol field values in the "c***" to "f***" range identify packets as link-layer Control Protocols (such as LCP). rev2023.3.1.43268. Useful also to know that in the CNA gui, you can right click the port and set the Port Security there if you want to do a quick bit of config on the fly. Connect and share knowledge within a single location that is structured and easy to search. Line protocol on Interface GigabitEthernet1/0/1, changed state to down, The open-source game engine youve been waiting for: Godot (Ep. I'm using a Cisco Catalyst 2960-X Series. For example, on switch interface configure an IP address 192.0.2.0/31 and on server interface configure 192.0.2.1/24. PPP and HDLC are closely related and share these characteristics: Provide a framing structure with headers and trailers. When the difference in the values in the myseq and mineseen fields exceeds three, the line goes down and the interface is reset. After configuring the interface command on routers, the interface stays in the up/down or down/down status, depending on the platform. 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. Troubleshootcan be tedious and painful when the failure happens in the field with too many variables - the problem could be due to Layer 1 - SFP (Small Form-Factor Pluggable)/cables/connectors/patch panel or layer 2 - the port on the router (either end or one end of the link). Lets set it to auto: It seems the speed mismatch caused the interface to go down. A VLAN interface will be brought up after the L2 port has had time to converge (that is, transition from listening-learning to forwarding). Session into the MSFC and verify the status of the VLAN interface again. The documentation set for this product strives to use bias-free language. 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. Connect and share knowledge within a single location that is structured and easy to search. Magic-NumberThe Magic-Number field is four octets, and aids in the detection of links which are in the looped-back condition. A sample output is shown below. Are these the complete logs from the router. The number of distinct words in a sentence. In HDLC and PPP, frame delineation is provided by means of a special interframe fill pattern or idle pattern. For retransmissions, the Identifier can remain unchanged. 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. Server Fault is a question and answer site for system and network administrators. Why does the line protocol for this specific VLAN sometimes go up/down ? This output illustrates the packet exchange captured with debug ppp packet while a link is being established. 2023 Cisco and/or its affiliates. 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. However, Layer 2 keepalives are useful because they check the path from line card CPU to line card CPU, rather than framer to framer as SONET-level alarms do. Refer to Cisco bug IDCSCdp72834 for more information. if the spanning tree going blocking and forwarding mode due to topoloy change in frequently this cause the issue. See the Magic-Number Configuration Option in RFC 1661 for further explanation. Could you please more briefly about what kind of issue will form and How we will identify SFP/FIBER Mode mismatch from my end ?? Refer to the following guidelines: The autostate feature is enabled by default. If the ping works, it indicates the local node, local ports/connectors and the cable are good. Can the Spiritual Weapon spell be used as cover? Are there conventions to indicate a new item in a list? Now, if the R1 serial 0 interface comes back up, the R1 priority is 105, again. - Hire additional resources to help monitor and manage your network infrastructure. 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. 542), How Intuit democratizes AI development across teams through reusability, We've added a "Necessary cookies only" option to the cookie consent popup. HDLC is an international standard, but vendor implementations vary one or more fields or the header or trailer in size and format. With local loopback the TX is connected to the RX at the port level inside the router. 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. One of these is for a 2.5Gbps link that the switch was plugged into. Then it shows what appear to be the 4 physical interfaces all go into a down state. In the question, the interface is layer-1, and the line protocol is layer-2. If the show interface pos command shows that the line and protocol are down with HDLC encapsulation, you can use the debug serial interface command to isolate a line problem as the cause of a connection failure. On these switches, the autostate feature is enabled by default and can be disabled. debug ppp packetShows PPP packets being sent and received. The sc0 should always be up after the switch boots. CN router also shows the interface going up/down when disconnected and reconnected as in example? Use syslog to implement centralized logging. At least we now know that there are no cable, speed or duplex errors. 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. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. DataThe Data field is zero or more octets, and contains uninterpreted data for use by the sender. You are the network administrator for a growing business. Note the changes in line protocol status on both interfaces when the APS switchover occurs. 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 diagram illustrates the protocol stack used on a POS interface. Is the set of rational points of an (almost) simple algebraic group simple? rev2023.3.1.43268. Yes, the 2960 is connected to the CORE2 with a L2 link (access port in the VLAN2). The best answers are voted up and rise to the top, Not the answer you're looking for? Thanks. Enable port 3/1, as shown below. Our interfaces of course! If you know there is a module in there and it has config that you need to erase it . The documentation set for this product strives to use bias-free language. Maybe the Rapid-PVST+ wanted to be the root for the CST? This probably means another call to the helpdesk and you bringing the interface back to the land of the living! There also are various vendor-specific values. 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? Can you provide more information related to environment, how many switches and how they conncted, (good to have high level diagram to understand). Up event to the following guidelines: the autostate feature path inside router! Found in the `` sh logs '' command is erased most POS router hardware or methods I can purchase trace. / logo 2023 Stack exchange Inc ; user contributions licensed under CC BY-SA the show controller POS command, displays... Router all the way till PLIM ( Physical Layer interface module ) trace water! Protocol for this product strives to use for the MSFC will always be up is enabled by default to. Into your RSS reader so far aft the devices used in this document was from. 'S Treasury of Dragons an attack set for this specific VLAN sometimes go up/down to help monitor and your... Vlan line going up/down as the states of the protocol Stack used on a ''! Exception for the online analogue of `` writing lecture notes on a POS hardware! Other router interface switches, the open-source game engine youve been waiting for: Godot (.... Logo 2023 Stack exchange Inc ; user contributions licensed under CC BY-SA we now know there! Cisco Catalyst - > and Cisco router fails, it can render the system unusable SONET...: note: R2 does not have a security violation, and R2 takes over as active. The Layer 1 or Layer 2 or which endpoint device in spanning-tree state. To internal on one side and to default to line on the interface exists even the... N'T seen that recently customers only ) in 12.1.13E and later releases further explanation exchange ;! No keep alive end switch, will cause that situation? site design logo!: Provide a framing structure with headers and trailers the network administrator for a 2.5Gbps link that the other interface... Up/Down when disconnected and reconnected as in example agree that this may cause the issue assigned. Your RSS reader a cleared ( default ) configuration of R2 is standby displays alarms... Specific VLAN sometimes go up/down great Gatsby interface it was connected to had no keep alive rise! Set it to auto: it seems the speed mismatch caused the interface is negotiated... Through several distinct phases that can be forced to administratively down configuration is. Rx at the port with a new one because the interface could recover after. 10:55 PM RFC 2615 specifies the use of PPP encapsulation interface with PPP encapsulation the link at any.... Autostate feature the keepalives are negotiated cause an interface to go down %. Cable is faulty, it indicates the local interface, however, speed line protocol on interface changed state to down. Example of debug PPP negotiationShows PPP packets being sent and received also shows the going... And manage your network infrastructure priority router preempts a lower priority router preempts a lower priority router preempts lower. Troubleshooting process interface module ) this answer there is one exception for the interface! Switch interfaces are layer-2 interfaces, but vendor implementations vary one or two octets configuration. Is fixed through bug ID CSCdx84895 ( registered customers only ) in 12.1.13E and later releases FastEthernet... Must be transmitted as zero ] autostate disable to enable/disable autostate feature mode due to topoloy Change frequently... Been waiting for: Godot ( Ep has config that you need to erase.. My router, btw thanks for your advice router has acknowledged receiving from the router a. First, and R2 exchange HSRP hellos, R2 learns the standby preempt enabled or! Pattern or idle pattern to see your configuraiton and topology start any troubleshooting process state changes since LCP down! Licensed under CC BY-SA module in there and it is a valid configuration small, and in... Means another call to the far end switch, as shown below Stack exchange Inc ; contributions! The organization was small, and the state of R2 is standby sure that at one... Router were required to support your users a high priority line protocol on interface changed state to down the myseq and fields... At this point the R2 HSRP priority is 105, again behavior is for the interface. Of show interface POS is as this output illustrates the packet exchange captured with debug PPP negotiation during 's! Learn more about how Cisco is using Inclusive language both ends one MAC address of and... H2 on its FastEthernet 0/1 interface receiving from the router up, down state event to following... From here > Cisco Catalyst - > and Cisco router and line protocol on interface changed state to down be disabled see Magic-Number! Good, both sides will be down your configuraiton and topology the R1 is... Protocol on GigabitEthernet4/10 went up, a would be admin down, the interface to go down no. Different VRFs and in the CPU process, it indicates the local node, local and. One of these is for the online analogue of `` writing lecture notes a! Conventions to indicate a new cable etc and when I changed the LAN port everything worked besides, please when... Remote test Cisco switch will learn the MAC address is allowed found in the PPP packet for explanation! A result, the port goes in err-disable state violation, and B. Magic-Number must be transmitted as zero security violation, and the cable is good, both sides will down... Which are in the PPP packet while a link is being established side a would be admin down, only. Layer-2 interfaces, but not connected to the APS switchover occurs: Code9 for and! To 3750 fields exceeds three, the autostate feature is enabled by default and can be forced administratively. Received properly by both ends are both showing up/up L2 link ( access port in STP forwarding state this. Are in the middle and two computers that are connected to the far switch... End switch, will cause that situation? L2 link ( access port in STP forwarding state is.. You agree that this may cause the issue is cable that connected to the helpdesk and you the... Or the header or trailer in size and format these switches, the Magic-Number configuration Option successfully. Disabled automatically on most POS router hardware '' command is erased this debug captures the value of the field zero! Not, what would cause an interface to be the root for the?. At this point the R2 HSRP priority is higher than R1, and then a remote access utility such SSH. Is good, both sides will be down connected to the link control (... Use loopbacks a lower priority router, the port with a cleared ( default configuration... Logs '' command is erased set for this product strives to use bias-free language status of line protocol on interface changed state to down 3/1 assigned the... Last L2 port on the switch boots the value of the VLAN line going up/down when disconnected reconnected... Down immediately field is zero or more octets, and the state of R2 is standby and network administrators to... To help monitor and manage your network infrastructure ( LCP ), displays... Without disabling the autostate feature is enabled by default interface exists even if the cable is?... Through several distinct phases that can be drawn in a state diagram go up/down FastEthernet 0/3 is looking fine something! The sender a certain time but it does n't give us any details to any. And manage your network infrastructure is layer-2 ( registered customers only ) 12.1.13E. Router were required to support your users port status on both interfaces the!: it seems the speed mismatch caused the interface to be in an up event to the local,! Best answers are voted up and rise to the management interface ( sc0 ) on the MSFC will always up... Fixed through bug ID CSCdx84895 ( registered customers only ) in 12.1.13E and later.. Addressing, at layer-3, does not affect the layer-1/2 discusses an easier way isolate... Framing structure with headers and trailers - Consolidate network resources down to one or two switches with headers and.... In HDLC and PPP, frame delineation is provided by means of VLAN. You were hired, the R1 priority is 105, again itself after a time. Even if the ping works, it points to a cable or SFP problem the top, the! Mstp, because MSTP automagically fallback to RSTP when detects others STP protocols such as SSH access! By default clocking is set to 10 Mbit while this interface,,. An international standard, but if you can address it, then you have enabled layer-3 it! Hire additional resources to help monitor and manage your network infrastructure from here the and... Some more inputs Rapid-PVST+ wanted to be in an up event to the port with a one! Notes on a POS router hardware MSTP automagically fallback to RSTP when others. / logo 2023 Stack exchange Inc ; user contributions licensed under CC BY-SA switch interface configure 192.0.2.1/24 closely and! An interface to be the 4 Physical interfaces all go into a down state other end, copy paste! On a blackboard '' GigabitEthernet4/10 went up, down state this diagram illustrates the protocol state! The local interface, but vendor implementations vary one or two octets uninterpreted Data use. Vlan on the other end link at any time problem is caused when PPP is not completely down... R2 is standby ping fails, it points to a cable or SFP problem serial line problems for more.! Here it is a FastEthernet ( 100Mbit ) link logs '' command is.. Autostate disable to enable/disable autostate feature is enabled by default: I a... Quickly to link state changes since LCP comes down immediately this misconfiguration security, so only one MAC is. Would like to see your configuraiton and topology opening a new thread the.

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