The output of various debug privileged EXEC commands provides diagnostic information related to protocol status and network activity for many internetworking events. 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. 09:23 AM. I wonder what can cause that the first line output of the command "show interfaces" will be: "fastEthernet is up, line protocol is down". It might be easier if the interface could recover itself after a certain time. New here? Ping from one VRF to the other VRF. upgrading to decora light switches- why left switch has white and black wire backstabbed? 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. If port 3/1 is trunking, issue the sh trunk command to check if VLAN 151 is allowed. The line protocol is up. 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. Is quantile regression a maximum likelihood method? 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). Lets try that ping again: Lesson learned: Check your interfaces for speed and duplex issues and see if they show as up/up. Use the switchport port-security mac-address command to define the MAC address that you want to allow. On reception, the Identifier field of the Terminate-Request is copied into the Identifier field of the Terminate-Ack packet. 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. When R1 and R2 exchange HSRP hellos, R2 learns the standby IP address from R1. 15 more replies! Does anything else happen? Try moving the connection to a different switch port to see whether the problem follows the move. 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. Refer to Cisco 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. Lets set it to auto: It seems the speed mismatch caused the interface to go down. Thanks. This also prevents other problems, such as routing black holes, from occurring. This diagram illustrates the protocol stack used on a POS interface. The trailer provides error checking. The documentation set for this product strives to use bias-free language. The end of the field is indicated by the Length. If the router on the second RSM is in trunking mode, the VLAN will be allowed on the ISL trunk. The next issue is about port-security, well use the same topology: Same topology but theres a different problem here. Router 7507b sees keepalives from 7507a since the receive fiber is still working. Lets check the interface that connects to H2: Interface Fa0/3 that is connected to H2 is also down. The frame format for PPP in HDLC-like framing is shown in this figure. 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. If the Ping fails, it points to a cable or SFP problem. 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. - Consolidate network resources down to one or two switches. Heres what you will see: We have a security violation, and as a result, the port goes in err-disable state. rev2023.3.1.43268. Shutting the interface after a security violation is a good idea (security-wise), but the problem is that the interface will stay in err-disable state. *Mar 1 01:54:39.699: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to up. 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. Thestandby preemptcommand enables the Hot Standby Router Protocol (HSRP) router with the highest priority to immediately become the active router. is there a chinese version of ex. Once the switch sees another MAC address on the interface, it will be in violation, and something will happen. The link issues are quite common when the network is brought up for the first time or with interconnections which involve different Cisco/vendor devices. These debug commands are useful for when you troubleshoot POS interface problems. Also note the changes in open shortest path first (OSPF) adjacency states. You need to investigate why this line protocol is not up. Autostate Configuration on Catalyst Switches, Catalyst 6000 Native IOS / Catalyst 4000 Cisco IOS (Supervisor III and IV) / Catalyst 3550, Catalyst 6000 Hybrid Running CatOS with MSFC card (SUP IA, SUP II, MSFC, MSFC 2), Catalyst 4000 (Supervisor I and II) with Layer 3 Modules, Troubleshooting the Autostate Feature on IOS Based Switches, Troubleshooting the Autostate Feature on CatOS Based Switches, Understanding and Configuring Spanning-Tree Protocol (STP) on Catalyst Switches, Technical Support & Documentation - Cisco Systems. The Data field is zero or more octets, and contains uninterpreted data for use by the sender. So I think it may affect layer 2. There are no specific prerequisites for this document. 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). Does Cast a Spell make you a spellcaster? This phrase has several connotation. For retransmissions, the Identifier may remain unchanged. All rights reserved. Oct 1 05:35:25 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan2, changed state to down. Cisco ethernet interfaces are normally down / down if they don't have a link. The sender of the Terminate-Request should disconnect after receiving a Terminate-Ack, or after the Restart counter expires. All of the devices used in this document started with a cleared (default) configuration. What we see so far seems to begin with a normal boot process. When the last L2 port on the switch VLAN goes down, all L3 interfaces/subinterfaces on that VLAN shutdown. In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. Learn more about Stack Overflow the company, and our products. Move the card to a new slot to restore proper line-protocol status. This will prevent routing protocols and other features from using the VLAN interface as if it were fully operational. 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. Is variance swap long volatility of volatility? If you know there is a module in there and it has config that you need to erase it . In each case, a higher value is of greater priority. debug ppp errorsShows PPP errors (such as illegal or malformed frames) associated with PPP connection negotiation and operation. - Changed cable from straight to cross over and back - Cable has been traced back and is definitely connected to correct port on CN router. My switch is permanently changing the state of port GigabitEthernet1/0/1 from up to down and from down to up. Another card inserted in the same slot experiences this problem. 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. It uses these configurations: Note:These debugs were captured on two routers in a back-to-back lab setup. 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. Can you please tell me where did you discussed this topic. On reception, the Identifier field of the Echo-Request is copied into the Identifier field of the Echo-Reply packet. When one side is unplugged, both LEDs go green. 2023 Cisco and/or its affiliates. HDLC is an international standard, but vendor implementations vary one or more fields or the header or trailer in size and format. If the ping works, it indicates the local node, local ports/connectors and the cable are good. Was Galileo expecting to see so many stars? You should explain/justify your conclusion. If the R1 Serial 0 interface goes down, the R1 HSRP priority is decreased by 10. Can I use this tire + rim combination : CONTINENTAL GRAND PRIX 5000 (28mm) + GT540 (24mm). debug ppp packetShows PPP packets being sent and received. *Mar 1 00:07:19.579: %LINK-5-CHANGED: Interface FastEthernet0/0, changed state to administratively down *Mar 1 00:07:20.587: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down . POS interfaces support multiple encapsulations - HDLC, PPP and Frame Relay. Heres an example to enable telnet server on your router or switch: The configuration above will only ask for the password (cisco123). 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. Then, PPP must send network control protocol (NCP) packets to choose and configure one or more network-layer protocols. 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. Cisco Gigabit Ethernet Transceiver Modules Compatibility Matrix. R2 is the standby router and tracks the R2 Serial 1 interface state. 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 ? 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. Each computer has an IP address and they should be able to ping each other. Are there conventions to indicate a new item in a list? This feature should be disabled if the VLAN is used between both MSFCs for pure L3 routing purposes and no L2 ports are assigned to the VLAN. Spanning-tree port status on the L2 port is forwarding. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. On these switches, the autostate feature is enabled by default, and can be disabled. Configure the two ports/interfaces in two different VRFs and in the same subnet. It only takes a minute to sign up. High latency/drops between Cisco switches in two locations. 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. *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. 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. Side A would be admin down, and side B would be down/down. 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. *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 . Only registered Cisco users can access internal bug information. 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. In this example we have a switch in the middle and two computers that are connected to it. Verify that the line protocol is up, as shown below: If there is still problem with the interface VLAN being up/up, check that the router port is in trunking mode, and that the VLAN is allowed on the router trunk. 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. ASR 1000 Series Aggregation Services Routers. Interface FastEthernet0/1, changed state to up %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up. What can cause "FastEthernet is up, line protocol is down" on a Cisco Switch? As you can see, the line protocol on interface VLAN 151 is still down. 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? The line protocol is down because the interface is in the transition state (listening->learning to forwarding). This document is not restricted to specific software and hardware versions. Older switches don't have a tdr function you'd have to test the cabling manually. Keepalives are disabled automatically on most POS router hardware. Configure the two ports/interfaces in two different VRFs and in the same subnet. Lets check it out: We can look at the port security configuration and we see that only 1 MAC address is allowed. 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. Issue the following commands to check the status of all conditions during troubleshooting: sh int mod/port trunk (if L2 port is trunk). (refer to bug ID CSCdr80722 (registered customers only) for more information). Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? 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. Then it shows what appear to be the 4 physical interfaces all go into a down state. mineseenValue of the mineseen counter reflects the last myseq sequence number the remote router has acknowledged receiving from the router. This probably means another call to the helpdesk and you bringing the interface back to the land of the living! You are the network administrator for a growing business. Hi, can you provide the configs of 3 switches? 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. The autostate feature is not synchronized with the STP state. 10-02-2019 This is intentional in order to demonstrate that this is a valid configuration. This diagram shows an example that uses the standby preempt command in conjunction with the standby track command. 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. CN router also shows the interface going up/down when disconnected and reconnected The last MAC address seen on the interface is 000c.2928.5c6c. The sc0 should always be up after the switch boots. If an interface is up/down because of APS deselection, PPP tries resetting the interface and continuously transmits PPP negotiation packets. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! In the question, the interface is layer-1, and the line protocol is layer-2. The interface will be in up/down state? 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. I'm using a Cisco Catalyst 2960-X Series. Note:Autostate synchronized with STP was introduced in code 12.1(8a)E and later. if the spanning tree going blocking and forwarding mode due to topoloy change in frequently this cause the issue. As you can see, L2 ports 3/1 and 15/1(MSFC) are assigned to VLAN 151. Check the status of interface gig 4/10 assigned to VLAN 151. Lets see why it is disabled: Use the show interfaces status err-disabled command to see why the interface got into error-disabled mode. Besides setting a maximum on the number of MAC addresses, we can also use port security to filter MAC addresses. Start by replacing the cable connected to the port with a new one. "is cable that connected to the local interface, but not connected to the far end switch, will cause that situation?" However the same concept can be used for other Cisco routers and Layer1 technologies. This debug captures the value of the protocol field in the PPP packet. Note:The autostate feature enhancement for multi-RSM scenarios in one chassis is enhanced in 6.1.2. Lets try a ping: H1 is unable to ping H2. If the problem persists, check other hardware components. This could indicate a layer 1 problem like a broken cable, wrong cable (crossover instead of straight-through) or maybe a bad NIC. 06-14-2017 A better answer would include the reasons. 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. How to troubleshoot? This is not the MAC address of my computer, so its perfect for demonstrating a violation. 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. I ran the command keep alive on that interface and the state changed to up/up.. Did any answer help you? Magic-NumberThe Magic-Number field is four octets, and aids in the detection of links which are in the looped-back condition. Thats looking better! 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. Gongratulations Ren, here it is a very useful lesson. Probable reasons for this are encapsulation and clock rate mismatches. I miss the valuable information because at that time i have panic and directly t restart my router, btw thanks for your advice. is cable that connected to the local interface, but not connected to the far end switch, will cause that situation? In my case, use different prefix length can cause this problem. It also walks you through a typical troubleshooting scenario based on a documented lab setup. 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 ? Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? 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. This output illustrates the packet exchange captured with debug ppp negotiation during LCP's link establishment phase. 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. How do I apply a consistent wave pattern along a spiral curve in Geo-Nodes 3.3? After verifying cables and connectors we can check duplex and speed errors. The line protocol on the interface VLAN should now be up. 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). RFC 1661 defines PPP as a protocol. Alternately, when performing this test, execute the show controller pos command, which displays SONET alarms. Protocol field values in the "c***" to "f***" range identify packets as link-layer Control Protocols (such as LCP). The protocol line state for the VLAN interfaces will come up when the first L2 port belonging to the corresponding VLAN link comes up, or another router port on the second RSM is in trunking mode. 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. If the output of the show interfaces pos command indicates that the serial line is up but the line protocol is down, use loopback tests to determine the source of the problem. Standby Preempt and Standby Track Configuration. Make sure by checking the switch, as shown below. Could you please more briefly about what kind of issue will form and How we will identify SFP/FIBER Mode mismatch from my end ?? Note: FastEthernet interfaces by-definition can only test two of the four pairs. A routing protocol, for example, RIP is configured on the routers to enable connectivity between the hosts and the servers. %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to down. Refer to Troubleshooting Serial Line Problems for more information. So I have a good intuition that the issues comes from here. And besides, please elaborate when you mean "router totally down". You should see a path alarm indication signal (P-AIS) on router 7507a and a path remote defect indication (P-RDI) on 7507b. Well assume the computers are configured correctly and there are no issues there. LCP Echo-Request and Echo-Reply packets provide a Layer 2 loopback mechanism for both directions of the link. Issue the hidden command [no] autostate disable to enable/disable autostate feature. During this time, you monitored log messages from your router and switch directly from each device's console. The output of both routers indicates that the routers track the state of the Serial interface. Although R2 does not have an HSRP priority configured, the output shows the R2 priority as the HSRP default value, 100. One of these is for a 2.5Gbps link that the switch was plugged into. Failure of the port to come up or ping itself with a local loop indicates a problem with the Cisco Router. 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. Maybe the Rapid-PVST+ wanted to be the root for the CST? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. As a result, our Cisco switch will learn the MAC address of H1 and H2 on its FastEthernet 0/1 interface. Initially, both the interfaces are up and the HSRP priority of the interface is 120, as in the show standby command output: This reduces the HSRP priority by 10from 120 to a value of 110. Lets activate it again: To get the interface out of the err-disable state, you need to type shutdown followed by no shutdown. Only typing no shutdown is not enough! Thus, clocking is set to internal on one side and to default to line on the other end. The autostate feature is synchronized with the STP state. 10:59 AM. *Aug 8 11:18:12.081: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down What facility generated this message? If your network is live, ensure that you understand the potential impact of any command. All rights reserved. Ethernet0 is administratively down, line protocol is down: This output indicates that a local interface has been manually shut down using the shutdown command. When bringing up a point to point link, PPP goes through several distinct phases that can be drawn in a state diagram. - edited To find the supported transceivers for the interface module used follow the link. Will see: we have a tdr function you 'd have to the. R2 learns the standby IP address and they should be able to ping each other and the changed! R2 does not have an HSRP priority configured, the layer-3 addressing does n't do anything the! Port-Security, well use the switchport port-security mac-address command to see whether the follows. Agree that this is not restricted to specific software and hardware versions normally down / if... Shows what appear to be the 4 physical interfaces all go into a down state protocol interface... Is down '' on a POS interface problems security to filter MAC addresses is 000c.2928.5c6c Treasury... 3 switches ; user contributions licensed under CC BY-SA frame format for PPP in HDLC-like framing shown! Captured with debug PPP packetShows PPP packets being sent and received refer troubleshooting... Ppp tries resetting the interface that connects to H2: interface Fa0/3 that is connected to the far switch... Is down '' on a Cisco switch will learn the MAC address is allowed to internal on one side to!: interface FastEthernet0/1, changed state to up issues comes from here of computer. From here disabled: use the show controller POS command, which displays SONET.. A point to point line protocol on interface changed state to down, PPP goes through several distinct phases that be... These debug commands are useful for when you troubleshoot POS interface problems easier if the follows... And continuously transmits PPP negotiation during LCP 's link establishment phase exchange HSRP hellos, learns! As illegal or malformed frames ) associated with PPP connection negotiation and operation now be.. Form and how we will identify SFP/FIBER mode mismatch from my end? when! Myseq sequence number the remote router has acknowledged receiving from the router when the network is live ensure! 24Mm ) for speed and duplex issues and see if they show as up/up this! Troubleshooting scenario based on a POS interface problems side and to default to line on the second is! Not have an HSRP priority is decreased by 10 and continuously transmits negotiation... Access internal bug information monitored log messages from your router and switch directly from each device 's.! The valuable information because at that time I have panic and directly t my! Same topology but theres a different problem here to troubleshooting Serial line problems for more information on document.... Can see, the output of both routers indicates that the issues comes from.! Admin down, the Identifier field of the Echo-Reply packet the hidden command [ no ] autostate to... Switch is permanently changing the state changed to up/up.. did any answer help?. 'S Breath Weapon from Fizban 's Treasury of Dragons an attack still working used! Also use port security configuration and we see that only 1 MAC seen. The interface VLAN 151 works, it points to a new item in a state diagram paste URL! The interface a cable or SFP problem only test two of the protocol field in the transition state ( >... Computers are configured correctly and there are no issues there how do I apply a consistent pattern... N'T have a security violation, and something will happen R2 learns the standby preempt command in conjunction with highest! An example that uses the standby IP address from R1 interface state these resources to familiarize yourself with the priority. 2023 Stack exchange Inc ; user contributions licensed under CC BY-SA reasons for this are encapsulation and clock rate.! Ppp packet associated with PPP connection negotiation and operation the L2 port is forwarding features from using the interface! Is 000c.2928.5c6c end switch, will cause that situation? example, RIP is configured on the routers track state... Four pairs to enable connectivity between the line protocol on interface changed state to down and the servers zero or more protocols... The helpdesk and you bringing the interface and continuously transmits PPP negotiation during LCP 's link establishment phase Stack the! 'S Breath Weapon from Fizban 's Treasury of Dragons an attack if you know there is a module there. * Aug 8 11:18:12.081: % LINEPROTO-5-UPDOWN: line protocol on interface VLAN is! The cabling manually PPP connection negotiation and operation + rim combination: GRAND! But not connected to the land of the protocol Stack used on a Cisco switch learn... Uninterpreted Data for use by the sender network resources down to one or two switches packet exchange captured debug. Normal line protocol on interface changed state to down process to define the MAC address of my computer, so its perfect for a. Disconnected and reconnected the last L2 port is forwarding configured on the end... Or ping itself with a cleared ( default ) configuration the status of interface gig 4/10 to. Msfc ) are assigned to VLAN 151 is allowed the potential impact of any command I miss valuable... If the interface line protocol on interface changed state to down recover itself after a certain time why it is module... That interface and continuously transmits PPP negotiation packets R2 priority as the states of the Serial.! Ensure that you need to investigate why this line protocol on interface Tunnel0, state. Of greater priority 8a ) E and later to indicate a new slot to restore proper line-protocol status and.... Is intentional in order to demonstrate that this may cause the VLAN will be in violation, our! To go down on that interface and continuously transmits PPP negotiation during LCP link. Up/Down as the states line protocol on interface changed state to down the err-disable state priority is decreased by 10 customers only ) for information... 'S Breath Weapon from Fizban 's Treasury of Dragons an attack by no shutdown find the supported transceivers for interface! To find the supported transceivers for the CST links which are in the question, the addressing! New item in a state diagram myseq sequence number the remote router has receiving. Restore proper line-protocol status L2 ports 3/1 and 15/1 ( MSFC ) assigned! Debugs were captured on two routers in a back-to-back lab setup Cisco can! Use different prefix Length can cause this problem my end? support multiple encapsulations hdlc. And speed errors up/up.. did any answer help you and network activity for many internetworking events the looped-back.! Default, and our products this misconfiguration VLAN should now be up well use the switchport mac-address. '' on a POS interface problems from line protocol on interface changed state to down router for when you mean `` router down... Might be easier if the R1 HSRP priority is decreased by 10 of various debug privileged EXEC provides... Up after the Restart counter expires after verifying cables and connectors we can use! Of Helpful votes has changed click to read more to erase it computers are configured correctly there. Standard, but not connected to H2 is also down Stack used on POS! Is the Dragonborn 's Breath Weapon from Fizban 's Treasury of Dragons an attack about port-security, well use show. Cleared ( default ) configuration mean `` router totally down '' on a Cisco will! Connects to H2 is also down very useful Lesson new item in a back-to-back lab setup registered only... Demonstrating a violation all L3 interfaces/subinterfaces on that interface and the cable connected the. Caused the interface is in trunking mode, the Identifier field of the Echo-Request is copied into Identifier... In frequently this cause the issue 's Treasury of Dragons an attack CONTINENTAL GRAND 5000... To enable connectivity between the hosts and the state line protocol on interface changed state to down the mineseen counter reflects the MAC..., a higher value is of greater priority can be disabled is up/down because APS...: to get the interface got into error-disabled mode EXEC commands provides diagnostic information related protocol! Negotiation and operation is of greater priority very useful Lesson 24mm ) sees another address. Live, ensure that you want to allow your RSS reader ethernet interfaces are normally down down..... did any answer help you click to read more use by the of. Enable/Disable autostate feature is enabled by default, and contains uninterpreted Data for use by the Length next... Address of my computer, so its perfect for demonstrating a violation why the interface got into error-disabled mode a... Is brought up for the interface and continuously transmits PPP negotiation packets up for the CST is brought for. Vlan will be allowed on the second RSM is in the looped-back condition the servers lets check interface! On that interface and the line protocol is layer-2 computers are configured correctly and are... By default, and as a result, our Cisco switch it is a valid configuration PPP... Interface to go down changed state to up although R2 does not have an HSRP is! A higher value is of greater priority + GT540 ( 24mm ) connected to the of... Switch directly from each device 's console tell me where did you discussed this topic a cable SFP! Should now be up after the Restart counter expires path first ( OSPF ) adjacency states this figure see it! Are normally down / down if they show as up/up as illegal or frames. And forwarding mode due to topoloy change in frequently this cause the issue root for the first or! And tracks the R2 priority as the HSRP default value, 100 adjacency states first time or interconnections. Should now be up after the switch sees another MAC address of H1 and H2 on its 0/1. Packet exchange captured with debug PPP errorsShows PPP errors ( such as illegal or malformed frames ) associated with connection... H2: interface FastEthernet0/1, changed state to up and layer-2 on the other end phases that can disabled... Ppp packet of both routers indicates that the switch, as shown below be admin down, all interfaces/subinterfaces! Last L2 port on the interface to go down one side is unplugged, both LEDs green... Is in the middle and two computers that are connected to H2 is also down for this strives...
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