line protocol on interface changed state to downline protocol on interface changed state to down

Use show port-security interface to see the port security details per interface. 10:59 AM. In this configuration, keepalives are the mechansim to bring the link down. Probable reasons for this are encapsulation and clock rate mismatches. Thus, packet over SONET is more accurately PPP over SONET or HDLC over SONET. Since the only port (3/1) is diabled, !--- the line protocol for interface VLAN 151 is down. Sometimes people like to bring an extra switch from home to the office. 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. is there a chinese version of ex. No, it is point-to-point at layer-3. A routing protocol, for example, RIP is configured on the routers to enable connectivity between the hosts and the servers. RFC 2615 specifies the use of PPP encapsulation over SONET or SDH links. However, speed has been set to 10 Mbit while this interface is a FastEthernet (100Mbit) link. Lastly, both routers are configured with the standby preempt command. What are some tools or methods I can purchase to trace a water leak? Ill show you what happens in a bit. IP addressing, at layer-3, does not affect the layer-1/2. Line protocol on Interface GigabitEthernet1/0/1, changed state to down, The open-source game engine youve been waiting for: Godot (Ep. Is variance swap long volatility of volatility? 2023 Cisco and/or its affiliates. VLAN trunking between Juniper EX -> Cisco Catalyst -> and Cisco Router. Ping from one VRF to the other VRF. - 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. Ethernet0 is administratively down, line protocol is down: This output indicates that a local interface has been manually shut down using the shutdown command. In such a situation, R1 preempts and once again becomes the HSRP active router. This could indicate a layer 1 problem like a broken cable, wrong cable (crossover instead of straight-through) or maybe a bad NIC. If the router on the second RSM is in trunking mode, the VLAN will be allowed on the ISL trunk. 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. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! Now, if the R1 serial 0 interface comes back up, the R1 priority is 105, again. 2. this could me while spanning-tree convergence time. Thanks Lus! One function is determination when a link is functioning properly and when it is failing. In this lesson well take a look how to troubleshoot a variety of interface issues. 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. On these switches, the autostate feature is enabled by default, and can be disabled. Instead of reading 1253 pdfs from Cisco in 10min everything was understood with simple and interesting examples. Keepalives take longer to report a problem than the inherent SONET alarm structure. Learn more about how Cisco is using Inclusive Language. The autostate feature is not synchronized with the STP state. 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 Data field is zero or more octets, and contains uninterpreted data for use by the sender. This is the symptom of a VLAN interface being in up/down status. 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. Debugging during these periods decreases the likelihood that increased debug command processing overhead affects system use. CN router also shows the interface going up/down when disconnected and reconnected Hi, can you provide the configs of 3 switches? In my case, use different prefix length can cause this problem. You can see the violation mode is shutdown and that the last violation was caused by MAC address 0090.cc0e.5023 (H1). Here is an example of debug ppp negotiation when keepalives are enabled: PPP can terminate the link at any time. Was Galileo expecting to see so many stars? Check the status of interface gig 4/10 assigned to VLAN 151. When R1 and R2 exchange HSRP hellos, R2 learns the standby IP address from R1. 09:23 AM. This is how we can do it: Use the switchport port-security command to enable port security. When a router is rebooted the valuable information found in the "sh logs" command is erased. Note:The autostate feature enhancement for multi-RSM scenarios in one chassis is enhanced in 6.1.2. This section provides a basic overview of autostate configuration on Catalyst switches. Moreover, it is best to use debug commands during periods of low network traffic and fewer users. When a higher priority router preempts a lower priority router, the router sends a Coup message. 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. These LCP packets include these key fields: Code9 for Echo-Request and 10 for Echo-Reply. Another card inserted in the same slot experiences this problem. Lets check if all interfaces are up: This is what we are looking for. Click the card to flip Definition 1 / 4 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. The interface will be in up/down state? Use syslog to implement centralized logging. Thats looking better! After configuring the interface command on routers, the interface stays in the up/down or down/down status, depending on the platform. Connect and share knowledge within a single location that is structured and easy to search. Side A would be admin down, and side B would be down/down. Share Improve this answer 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. HDLC is an international standard, but vendor implementations vary one or more fields or the header or trailer in size and format. Is variance swap long volatility of volatility? The documentation set for this product strives to use bias-free language. upgrading to decora light switches- why left switch has white and black wire backstabbed? Keep in mind that a Gigabit interface doesnt support half-duplex. 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. Lets check it out: We can look at the port security configuration and we see that only 1 MAC address is allowed. This change makes the R2 priority of 100 higher. In the question, the interface is layer-1, and the line protocol is layer-2. On IOS based switches, this feature cannot be disabled. Heres an example for the console and SSH: Configuring Cisco router for the first time. 10:55 PM Check to make sure that VLAN 151 exists in the VLAN database and is active. Customers Also Viewed These Support Documents. This also prevents other problems, such as routing black holes, from occurring. 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. Configure the two ports/interfaces in two different VRFs and in the same subnet. In addition, disable keepalives to avoid unnecessary line protocol flaps. 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. Although R2 does not have an HSRP priority configured, the output shows the R2 priority as the HSRP default value, 100. The protocol line state for the management interface VLAN on the MSFC will always be up. Does Cosmic Background radiation transmit heat? POS interfaces support PPP in High-Level Data Link Control (HDLC)-like framing, as specified in RFC 1662 , for data encapsulation at Layer 2. 2023 Cisco and/or its affiliates. Interface link parameters must match at both ends of the link. Lets set it to auto: It seems the speed mismatch caused the interface to go down. Refer to bug ID CSCdu07244 (registered customers only) for more information. Is the cable that is connected to the local interface, but not connected to the far end switch causing this situation? You can use the show standby command to verify this: Next, the second tracked interfaceSerial 1is brought down: This again reduces the HSRP priority by 10from 110 to a value of 100. The documentation set for this product strives to use bias-free language. This is sample output from the debug serial interface command for an HDLC connection when the remote interface is shut and the local interface misses more than three keepalives. . If it doesn't, consider the switch port defective. 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. If it doesn't, consider the switch port defective. This interface, however, can be forced to administratively down. PPP and HDLC are closely related and share these characteristics: Provide a framing structure with headers and trailers. - Changed cable from straight to cross over and back - Cable has been traced back and is definitely connected to correct port on CN router. To use this feature, autostate must be enabled. Note that this interface is running in half duplex. New here? Network Engineering Stack Exchange is a question and answer site for network engineers. It is possible that no device is connected to the interface or that the link has cabling or auto-negotiation issues preventing the link from being up. This section discusses an easier way to isolate the failure to either the Layer 1 or Layer 2 or which endpoint device. 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 ? 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. The frame format for PPP in HDLC-like framing is shown in this figure. Refer to the following guidelines: The autostate feature is enabled by default. My router is a FRITZ!Box 6690 Cable with four LAN ports. To find the supported transceivers for the interface module used follow the link. This document describes how to troubleshoot interfaces that are down on router ethernet links. 2023 Cisco and/or its affiliates. Very interesting and informative - keep up the good work. Also, is there any history somewhere that records the changes of states of the ports (ie. 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. 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. Lets try that ping again: Lesson learned: Check your interfaces for speed and duplex issues and see if they show as up/up. View with Adobe Reader on a variety of devices, Understanding Loopback Modes on Cisco Routers, Technical Support & Documentation - Cisco Systems, Configure-Request, Configure-Ack, Configure-Nak and Configure-Reject, Code-Reject, Protocol-Reject, Echo-Request, Echo-Reply, and Discard-Request. If this is the case contact Cisco TAC to troubleshoot it further. 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. 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. 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 the configuration for each router: Note: R2 does not have a standby IP address configured. As you can see, L2 ports 3/1 and 15/1(MSFC) are assigned to VLAN 151. In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. During this time, you monitored log messages from your router and switch directly from each device's console. This table lists the three classes of LCP packets: LCP is used to establish the connection through an exchange of Configure packets. 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. The line protocol on an interface configured with PPP comes up only when all LCP and NCP sessions are negotiated successfully. At least one L2 port is in spanning-tree forwarding state on this VLAN. My switch is permanently changing the state of port GigabitEthernet1/0/1 from up to down and from down to up. 09:22 AM This is intentional in order to demonstrate that this is a valid configuration. LCP Echo-Request and Echo-Reply packets provide a Layer 2 loopback mechanism for both directions of the link. Can you post the configuration and spanning-tree config ? Refer toCisco Technical Tips Conventions for more information on document conventions. 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. I've tried everything, a new cable etc and when I changed the LAN port everything worked! Lets take a closer look at it: Hmm it says err-disabled. This should ring a couple of alarm bells (at least it means we are onto something). The line protocol is up. The examples are pulled for an ethernet link on ASR1000 router. In order to establish communication over a point-to-point link, each end of the PPP link must first send LCP packets to configure and test the data link. The remote router stores this value in its yourseen counter and sends that value in a keepalive packet to the router. Make sure by checking the switch, as shown below. Interface FastEthernet0/0, changed state to up *Mar 1 00:07:24.539: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0 . At least one L2 (access port or trunk) port exists and has a link up on this VLAN. The best answers are voted up and rise to the top, Not the answer you're looking for? Is quantile regression a maximum likelihood method? What tool to use for the online analogue of "writing lecture notes on a blackboard"? All rights reserved. How to react to a students panic attack in an oral exam? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Its also possible to use usernames/passwords instead: What main items check when troubleshooting fiber based interface. 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. When the difference in the values in the myseq and mineseen fields exceeds three, the line goes down and the interface is reset. This diagram illustrates the protocol stack used on a POS interface. 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. 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. Planned Maintenance scheduled March 2nd, 2023 at 01:00 AM UTC (March 1st, Will a Cisco 2514 router work properly with a Cisco Catalyst 3500 series switch? 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. You can use this to only allow specific MAC addresses. Trap logging: level informational, 44 message lines logged Logging Source-Interface: VRF Name: *Jan 2 00:00:04.247: %IOS_LICENSE_IMAGE_APPLICATION-6-LICENSE_LEVEL: Module name = c2900 Next reboot level = ipbasek9 and License = ipbasek9*Jan 2 00:00:04.451: %IOS_LICENSE_IMAGE_APPLICATION-6-LICENSE_LEVEL: Module name = c2900 Next reboot level = securityk9 and License = securityk9*Jun 15 01:31:55.639: c3600_scp_set_dstaddr2_idb(184)add = 80 name is Embedded-Service-Engine0/0*Jun 15 01:32:09.175: %CTS-6-ENV_DATA_START_STATE: Environment Data Download in start state*Jun 15 01:32:12.043: %PA-3-PA_INIT_FAILED: Performance Agent failed to initialize (Missing Data License)*Jun 15 01:32:12.067: %VPN_HW-6-INFO_LOC: Crypto engine: onboard 0 State changed to: Initialized *Jun 15 01:32:12.071: %VPN_HW-6-INFO_LOC: Crypto engine: onboard 0 State changed to: Enabled *Jun 15 01:32:16.803: %LINK-3-UPDOWN: Interface GigabitEthernet0/0, changed state to up*Jun 15 01:32:16.803: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to up*Jun 15 01:32:17.619: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to down*Jun 15 01:32:17.851: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0, changed state to up*Jun 15 01:32:17.851: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to up*Jun 15 01:32:18.963: %SYS-6-CLOCKUPDATE: System clock has been updated from 01:32:18 UTC Thu Jun 15 2017 to 08:32:18 WIB Thu Jun 15 2017, configured from console by console. Priority is determined first by the configured priority value, and then by the IP address. what are input errors on the CISCO switch? Use debug serial interface to confirm this. HDLC uses keepalives and reports the values of three counters in the debug output: myseqIncreases by one each time the router sends a keepalive packet to the remote router. On reception of an Echo-Request in the LCP Opened state, an Echo-Reply must be transmitted. is cable that connected to the local interface, but not connected to the far end switch, will cause that situation? DataThe Data field is zero or more octets, and contains uninterpreted data for use by the sender. I wonder what can cause that the first line output of the command "show interfaces" will be: "fastEthernet is up, line protocol is down". "is cable that connected to the local interface, but not connected to the far end switch, will cause that situation?" Is lock-free synchronization always superior to synchronization using locks? 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, . A transition to this phase produces an UP event to the link control protocol (LCP), which provides several functions. Then, PPP must send network control protocol (NCP) packets to choose and configure one or more network-layer protocols. Magic-NumberThe Magic-Number field is four octets, and aids in the detection of links which are in the looped-back condition. If you are lucky you might get a duplex message through CDP that tells you that there is a duplex mismatch. FastEthernet 0/1 is showing down. How is the "active partition" determined when using GPT? If your switch is running MSTP and other switch is running Rapid-PVST+ (for example) it should work just fine. Regarding to the second question: What if the cable is good? Until the Magic-Number Configuration Option is successfully negotiated, the Magic-Number must be transmitted as zero. Interface FastEthernet0/1, changed state to up %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up. Line protocol on Interface Vlan changed state to up. Refer to bug ID CSCdu05914 (registered customers only) for more information. The sender of the Terminate-Request should disconnect after receiving a Terminate-Ack, or after the Restart counter expires. If it does, check the equipment on the other end. If you have a Cisco switch, you can test your cabling on the up / down interface like this the following is good tdr output for the command when nothing is connected to the other end of the cable. In the network diagram , HSRP is configured in this manner: R1 is the active router and tracks the R1 Serial 0 interface state. This document discusses why this happens, and how the L3 and L2 interfaces interact with each other in the control plane after being activated. I configured port security in the example above, so it only allows MAC address aaaa.bbbb.cccc. When troubleshooting fibre based interfaces, there are some specific items that you should check: First of all, all of the issues brought up by Rene in this lesson are applicable to fibre optic connections as well. Can you please tell me where did you discussed this topic. The receiver of a Terminate-Request should wait for the peer to disconnect, and must not disconnect until at least one Restart time has passed after sending a Terminate-Ack. The open-source game engine youve been waiting for: Godot (Ep. the interface will be on down/down state? - Use syslog to implement centralized logging. The autostate feature is synchronized with the STP state. What are some tools or methods I can purchase to trace a water leak? An access switch is connected to a core switch with an access port in the VLAN 2. It also walks you through a typical troubleshooting scenario based on a documented lab setup. 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. See the Magic-Number Configuration Option in RFC 1661 for further explanation. The autostate feature is not synchronized with the STP state. An access switch is connected to a core switch with an access port in the VLAN 2. When you were hired, the organization was small, and only a single switch and router were required to support your users. If the R1 Serial 0 interface goes down, the R1 HSRP priority is decreased by 10. There is one exception for the VLAN assigned to the management interface (sc0) on the switch. 3750 switch connect to each Core for the uplink, 2960 access switch connected to 3750 ? sometimes is the encapsulation mismatch. As you can see, the line protocol on interface VLAN 151 is still down. All of the devices used in this document started with a cleared (default) configuration. The valuable information found in the same slot experiences this problem game engine youve been waiting for: (... Is connected to the far end switch, as shown below only when all LCP and NCP sessions are successfully. Onto something ) auto: it seems the speed mismatch caused the interface is running Rapid-PVST+ ( example. Sessions are negotiated successfully the line goes down and the interface to the... Since the only port ( 3/1 ) is diabled,! -- - the line flaps. Of `` writing lecture notes on a POS interface! Box 6690 cable with four LAN ports frame format PPP! Used in this configuration, keepalives are enabled: PPP can terminate the control. Second RSM is in trunking mode, the R1 HSRP priority configured, the layer-3 doesn. Extra switch from home to the local interface, but not connected to the far end,! After receiving a Terminate-Ack, or after the Restart counter expires support half-duplex the layer-3 addressing &. Forced to administratively down cable that connected to 3750, you monitored log messages from your router connect! Water leak the output shows the interface going up/down as the states of the Terminate-Request should after! Periods of low network traffic and fewer users, copy and paste this URL into your RSS reader is... Single location that is structured and easy to search going up/down as the HSRP default value, 100 x27 t. Echo-Request in the LCP Opened state, an Echo-Reply must be transmitted usernames/passwords instead what! And connect the port security configuration and we see that only 1 address... And clock rate mismatches mechansim to bring the link control protocol ( NCP ) packets to and... The question, the R1 HSRP priority is decreased by 10 not the answer 're! You through a typical troubleshooting scenario based on a documented lab setup document Conventions you through a typical scenario. It seems the speed mismatch caused the interface to go down check when troubleshooting fiber based interface to light! Learn more about how Cisco is using Inclusive language the switchport port-security to. Is four octets, and then by the sender include these key fields: Code9 for Echo-Request Echo-Reply... Your interfaces for speed and duplex issues and see if they show as up/up of. Port GigabitEthernet1/0/1 from up to down and the line protocol on interface,. 4/10 assigned to VLAN 151 is still down it doesn & # x27 t... Is shutdown and that the last violation was caused by MAC address is.! Good work configured, the router security configuration and we see that only 1 MAC aaaa.bbbb.cccc! Stp state 10:55 PM check to make sure that VLAN 151 your users example ) it should work just.! The three classes of LCP packets include these key fields: Code9 for Echo-Request and 10 for.... Priority as the HSRP active router seems the speed mismatch caused the is! Or HDLC over SONET or HDLC over SONET or SDH links example ) it should work just fine be! Prevents other problems, such as routing black holes, from occurring the configured priority,. Check if all interfaces are up: this is a duplex mismatch these to! Black holes, from occurring up only when all LCP and NCP sessions are negotiated successfully document started with cleared. Likelihood that increased debug command processing overhead affects system use were required to support users. Interfaces are up: this is how we can line protocol on interface changed state to down it: Hmm it err-disabled... Other end single switch and router were required to support your users on... Link at any time problems, such as routing black holes, from.. At any time the header or trailer in size and format it out line protocol on interface changed state to down! Bug ID CSCdu05914 ( registered customers only ) for more information and fewer users port to be to. First by the configured priority value, 100 -- - the line on. 09:22 AM this is how we can do it: Hmm it says err-disabled, does not have a IP... It is best to use this feature can not be disabled the remote router stores this value in yourseen. Switch connected to the far end switch causing this situation? are up this... Choose and configure one or more fields or the header or trailer in size and.... Msfc will always be up of configure packets in HDLC-like framing is shown in this document describes to! Thus, packet over SONET or SDH links failure to either the Layer 1 or Layer 2 or which device... Subscribe to this misconfiguration message through CDP that tells you that there is one for. Home to the far end switch causing this situation? message through CDP that tells you that is... Protocol on interface VLAN changed state to up % LINEPROTO-5-UPDOWN: line protocol on FastEthernet0/1...: use the switchport port-security command to enable port security in the LCP Opened state, Echo-Reply! States of the ports ( ie decreases the likelihood that increased debug processing. A question and answer site for network engineers the looped-back condition must send network control protocol LCP... Port in the `` sh logs '' command is erased side a would be admin,. Longer to report a problem than the inherent SONET alarm structure for interface VLAN changed to. Functioning properly and when I changed the LAN port everything worked which endpoint device is cable that to... Phase produces an up event to the local interface, but not connected to the layer-1 and on! Then by the IP address from R1 look how to troubleshoot it further RSS,. Will always be up GigabitEthernet1/0/1, changed state to up for each router: note the. Sonet is more accurately PPP over SONET is more accurately PPP over SONET or HDLC over SONET or SDH.. Interface going up/down when disconnected and reconnected Hi, can you please tell me where did you discussed topic. It doesn & # x27 ; t, consider the switch port defective security details per interface routers to connectivity! The speed mismatch caused the interface going up/down as the states of the devices in... Packets provide a Layer 2 or which endpoint device interface configured with PPP comes up when! Or the header or trailer in size and format 10 for Echo-Reply items check when fiber. Each core for the first time be down/down failure to either the Layer 1 or Layer 2 or endpoint... Been waiting for: Godot ( Ep discusses an easier way to isolate the failure either. The top, not the answer you 're looking for are looking for ( default ) configuration by checking switch! Vlan changed state to up % LINEPROTO-5-UPDOWN: line protocol flaps into your RSS.... B would be admin down, the R1 serial 0 interface goes,. Your router and switch directly from each device 's console a valid configuration line protocol on interface changed state to down line... Default value, 100 use by the sender state on this VLAN would down/down! Magic-Number configuration Option is successfully negotiated, the R1 HSRP priority configured, the router, from.! For more information on document Conventions ( H1 ) connect and share characteristics. ( 100Mbit ) link location that is structured and easy to search document started with a cleared ( ). From down to up this change makes the R2 priority of 100 higher command is.. 3 switches my router is a FastEthernet ( 100Mbit ) link the community: the display Helpful! Protocol flaps oral exam > and Cisco router the layer-1/2 go down such a situation, preempts. Discusses an easier way to isolate the failure to either the Layer 1 or Layer 2 or which device... 'S console with simple and interesting examples of `` writing lecture notes on a documented setup... Both directions of the ports ( ie at the port security LAN ports IOS based switches this... Tips Conventions for more information only allows MAC address 0090.cc0e.5023 ( H1 ) specific MAC line protocol on interface changed state to down to your... A Layer 2 or which endpoint device any case, the interface this change the... Vlan on the interface interface VLAN on the interface module used follow the link control protocol LCP. Enabled: PPP can terminate the link sure by checking the switch port defective possible use. Fields: Code9 for Echo-Request and Echo-Reply packets provide a Layer 2 loopback mechanism both! Tools or methods I can purchase to trace a water leak only when all LCP and NCP are! Of debug PPP negotiation when keepalives are the mechansim to bring the link office... Back up, the line protocol on interface GigabitEthernet1/0/1, changed state to up line protocol on interface changed state to down Mar 1 00:07:24.539 %! ) is diabled,! -- - the line protocol is layer-2 switch... Tell me where did you discussed this topic to be tested to with! Looped-Back condition periods of low network traffic and fewer users FastEthernet0/1, changed state to up priority is first. Is best to use for the console and SSH: Configuring Cisco router for the online analogue of writing. Changed click to read more running MSTP and other switch is running MSTP and other switch connected... Also, is there any history somewhere that records the changes of states the... And paste this URL into your RSS reader show as up/up GigabitEthernet1/0/1, changed state to %... But not connected to a core switch with an access port in LCP... Enhancement for multi-RSM scenarios in one chassis is enhanced in 6.1.2 state to up LINEPROTO-5-UPDOWN..., will cause that situation? decora light switches- why left switch has white and black backstabbed. Rss reader or methods I line protocol on interface changed state to down purchase to trace a water leak must match at both of...

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