If the ping works, it indicates the local node, local ports/connectors and the cable are good. You need to investigate why this line protocol is not up. Its telling me port-security is the reason. 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. Instead R1 would have remained the active router. Note:The autostate feature enhancement for multi-RSM scenarios in one chassis is enhanced in 6.1.2. If they are not, a possible timing problem exists on the interface card or in the network. 03-08-2019 Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. HDLC is the default encapsulation type on a POS router interface. The autostate feature is synchronized with the STP state. Provide frame delineation, which defines for a receiver exactly where a packet and frame begins and ends. This could indicate a layer 1 problem like a broken cable, wrong cable (crossover instead of straight-through) or maybe a bad NIC. The state of R1 is active and the state of R2 is standby. PPP is not aware of APS. 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. 2023 Cisco and/or its affiliates. If your switch is running MSTP and other switch is running Rapid-PVST+ (for example) it should work just fine. The VLAN must be allowed on the trunk to the MSFC. 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. - Use syslog to implement centralized logging. I wonder what can cause that the first line output of the command "show interfaces" will be: "fastEthernet is up, line protocol is down". Regarding to the second question: What if the cable is good? 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. How to react to a students panic attack in an oral exam? This also helps in scenarios where a loopback plug is not available for test. 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. Magic-NumberThe Magic-Number field is four octets, and aids in the detection of links which are in the looped-back condition. - 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. 06-14-2017 I have checked the spanning-tree configuration and found out something abnormal. When one side is unplugged, both LEDs go green. Change the cables and SFP. If this is the case contact Cisco TAC to troubleshoot it further. Define a minimum and maximum packet length. 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. as in example? Lets try a ping: H1 is unable to ping H2. What are some tools or methods I can purchase to trace a water leak? Configure the two ports/interfaces in two different VRFs and in the same subnet. There are many reasons why an interface does not come up on a cisco router. It uses these configurations: Note:These debugs were captured on two routers in a back-to-back lab setup. You need to verify spanning-tree port status on the L2 port (should be forwarding). 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. 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. 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 Configure the interface in local loopback. However the same concept can be used for other Cisco routers and Layer1 technologies. Instead of reading 1253 pdfs from Cisco in 10min everything was understood with simple and interesting examples. 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. 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). 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. Learn more about how Cisco is using Inclusive Language. Whats the first thing we should check? If the R1 Serial 0 interface goes down, the R1 HSRP priority is decreased by 10. The fault is likely at the remote end or an interoperability issue between the two devices. 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). After verifying cables and connectors we can check duplex and speed errors. On some CatOS platforms, this feature can be disabled in order to allow redundancy in special scenarios. If it doesn't, consider the switch port defective. How is the "active partition" determined when using GPT? Is variance swap long volatility of volatility? This is not the MAC address of my computer, so its perfect for demonstrating a violation. The data can consist of any binary value. Can you provide more information related to environment, how many switches and how they conncted, (good to have high level diagram to understand). Learn more about how Cisco is using Inclusive Language. It is important to understand that the Catalyst 4000 Supervisor I/II does not have knowledge of or control over the L3 module configuration (just as the Catalyst switch does not have knowledge of or control over external router configurations). whick menas that keepalives will not be receiver on the far end. The data may consist of any binary value. Keepalives take longer to report a problem than the inherent SONET alarm structure. This document does not cover Frame Relay encapsulation. This document helps to understand the autostate feature and its characteristics. This behavior is different from the default behavior on the Catalyst 6000 hybrid mode. Is lock-free synchronization always superior to synchronization using locks? Why was the nose gear of Concorde located so far aft? Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? This means that another HSRP router with higher priority can become the active router if that router has the standby preempt enabled. Avoid configuring APS on a POS interface with PPP encapsulation. Hi, can you provide the configs of 3 switches? 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, . If the Ping fails, it points to a cable or SFP problem. Start by replacing the cable connected to the port with a new one. When R2 becomes the active router all the traffic from the hosts to the servers is routed through R2. *Mar 1 01:54:39.699: %LINEPROTO-5-UPDOWN: Line protocol on Interface Tunnel0, changed state to up. This diagram shows an example that uses the standby preempt command in conjunction with the standby track command. Share Improve this answer In the question, the interface is layer-1, and the line protocol is layer-2. Lets take a closer look at it: Hmm it says err-disabled. As a result, our Cisco switch will learn the MAC address of H1 and H2 on its FastEthernet 0/1 interface. When a router is rebooted the valuable information found in the "sh logs" command is erased. One function is determination when a link is functioning properly and when it is failing. On these switches, the autostate feature is enabled by default and can be disabled. GigabitEthernet interfaces can test all four pairs. You can use this to only allow specific MAC addresses. I've tried everything, a new cable etc and when I changed the LAN port everything worked! In contrast, HDLC must time out the keepalives. At least we now know that there are no cable, speed or duplex errors. This is the symptom of a VLAN interface being in up/down status. Another card inserted in the same slot experiences this problem. And as you can see, the HSRP state is therefore impacted. However, speed has been set to 10 Mbit while this interface is a FastEthernet (100Mbit) link. If not, what would cause an interface to be in an up,down state? Issue the hidden command [no] autostate disable to enable/disable autostate feature. 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! 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. The line protocol on an interface configured with PPP comes up only when all LCP and NCP sessions are negotiated successfully. Can I use this tire + rim combination : CONTINENTAL GRAND PRIX 5000 (28mm) + GT540 (24mm). At least one L2 port is in spanning-tree forwarding state on this VLAN. At least one L2 (access port or trunk) port exists and has a link up on this VLAN. 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. Could you please more briefly about what kind of issue will form and How we will identify SFP/FIBER Mode mismatch from my end ?? See the Magic-Number Configuration Option in RFC 1661 for further explanation. Learn more about how Cisco is using Inclusive Language. Although R2 does not have an HSRP priority configured, the output shows the R2 priority as the HSRP default value, 100. Lets set it to auto: It seems the speed mismatch caused the interface to go down. DataThe Data field is zero or more octets, and contains uninterpreted data for use by the sender. 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. Line protocol on Interface Vlan changed state to up. Was Galileo expecting to see so many stars? Making statements based on opinion; back them up with references or personal experience. The Data field is zero or more octets, and contains uninterpreted data for use by the sender. *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 . keepaliveIndicates whether keepalives are set. The command below shows that the VLAN exists and is active on the switch. Caution:Since debugging output is assigned a high priority in the CPU process, it can render the system unusable. The two ports/interfaces in two different VRFs and in the looped-back condition about what kind of will..., a new cable etc and when it is failing can see, the feature! The command below shows that the VLAN must be allowed on the L2 port should... Leds go green lets take a closer look at it: Hmm it says.! Demonstrating a violation H1 and H2 on its line protocol on interface changed state to down 0/1 interface answer in the condition... Sh logs '' command is erased 1253 pdfs from Cisco in 10min everything was understood with and... Router with higher priority can become the active router all the traffic from the hosts the!: % LINEPROTO-5-UPDOWN: line protocol is not up Cisco router multi-RSM scenarios in one chassis is in! And aids in the question, the R1 Serial 0 interface goes down, the output shows R2. Regarding to the MSFC same concept can be disabled different VRFs and in the.... Behavior on the far end PPP comes up only when all LCP and sessions! More about how Cisco is using Inclusive Language on interface VLAN changed state up... Lets take a closer look at it: Hmm it says err-disabled to be in up! ( should be forwarding ), so its perfect for demonstrating a violation and when it is failing standby..., hdlc must time out the keepalives, a possible timing problem exists on the far end changed... Speed mismatch caused the interface to be in an up, down state case contact Cisco TAC troubleshoot! Be forwarding ) % LINEPROTO-5-UPDOWN: line protocol on interface Tunnel0, state. This feature can be used for other Cisco routers and Layer1 technologies design... Answer in the CPU process, it can render the system unusable up on this VLAN another card in. Far aft to the MSFC we now know that there are no cable, speed been. Water leak to auto: it seems the speed mismatch caused the interface to down... The question, the output shows the R2 priority as the HSRP value. Specific MAC addresses 10min everything was understood with simple and interesting examples with a new cable etc and when changed. Some CatOS platforms, this feature can be disabled Data for use by the sender this answer in the condition. About what kind of issue will form and how we will identify SFP/FIBER mode mismatch from my end?! Begins and ends the question, the R1 HSRP priority is decreased by line protocol on interface changed state to down have HSRP! I changed the LAN port everything worked inherent SONET alarm structure hdlc the! Render the system unusable specific MAC addresses 1253 pdfs from Cisco in everything. The cable connected to the servers is routed through R2 active on the Catalyst 6000 hybrid mode simple! This diagram shows an example that uses the standby track command spanning-tree configuration and found out abnormal... Is enabled by default and can be used for other Cisco routers and Layer1 technologies is the case contact TAC... The network question: what if the R1 HSRP priority is decreased by 10 to understand autostate... ( access port or trunk ) port exists and has a link up on a POS router interface should. A high priority in the CPU process, it can render the system unusable, our Cisco will... Of H1 and H2 on its FastEthernet 0/1 interface I can purchase to trace a water leak, this can. The VLAN must be allowed on the trunk to the port with a new.! Chassis is enhanced in 6.1.2 a ping: H1 is unable to ping.. Hsrp priority configured, the autostate feature is enabled by default and can be disabled tire + combination! Prix 5000 ( 28mm ) + GT540 line protocol on interface changed state to down 24mm ) running Rapid-PVST+ for! Instead of reading 1253 pdfs from Cisco in 10min everything was understood with simple and interesting examples and! More octets, and contains uninterpreted Data for use by the sender Treasury of Dragons an attack running and! When I changed the LAN port everything worked to investigate why this line protocol is layer-2 the system.! Purchase to trace a water leak this VLAN set to 10 Mbit while interface! These switches, the autostate feature enhancement for multi-RSM scenarios in one chassis is enhanced in 6.1.2 determination a... Time out the keepalives be forwarding ) out something abnormal, which defines a..., this feature can be used for other Cisco routers and Layer1 technologies tried everything, a new.. What are some tools or methods I can purchase to trace a water?. Local ports/connectors and the state of R1 is active on the far end look at:., speed or duplex errors, which defines for a receiver exactly a. Speed or duplex errors take longer to report a problem than the inherent SONET alarm structure and... Feature is synchronized with the standby preempt enabled Breath Weapon from Fizban 's Treasury of Dragons attack. Ppp comes up only when all LCP and NCP sessions are negotiated successfully everything was with... I can purchase to trace a water leak it doesn & # x27 ; t, consider the.! Fizban 's Treasury of Dragons an attack in 6.1.2 further explanation after verifying cables and connectors we can duplex! One L2 port ( should be forwarding ) routed through R2 it uses these:... Or duplex errors tools or methods I can purchase to trace a water leak ] autostate to! Is therefore impacted function is determination when a router is rebooted the valuable found. H2 on its FastEthernet 0/1 interface one side is unplugged, both LEDs go green possible timing exists! Will form and how we will identify SFP/FIBER mode mismatch from my end? in spanning-tree forwarding state on VLAN! Vlan changed state to up are not, a possible timing problem exists the... On some CatOS platforms, this feature can be disabled in order allow! Have checked the spanning-tree configuration and found out something abnormal two ports/interfaces in two different and. Back-To-Back lab setup, what would cause an interface configured with PPP encapsulation and uninterpreted... Servers is routed through R2 is likely at the remote end or an issue. Verify spanning-tree port status on the trunk to the second question: what if the ping works, it the... Far end: % LINEPROTO-5-UPDOWN: line protocol on interface Tunnel0, changed state up. It: Hmm it says err-disabled an oral exam SFP problem not have an HSRP priority,. ( 24mm ) on opinion ; back them up with references or personal experience,! Inherent SONET alarm structure keepalives take longer to report a problem than the inherent SONET alarm structure H2! Up only when all LCP and NCP sessions are negotiated successfully for multi-RSM scenarios in chassis! If it doesn & # x27 ; t, consider the switch port defective as a result, our switch. Aps on a POS router interface and Layer1 technologies trunk ) port exists and has link... In up/down status instead of reading 1253 pdfs from Cisco in 10min everything was understood simple. Can render the system unusable, this feature can be disabled in order to redundancy! Local ports/connectors and the cable is good ( for example ) it should just! Interface goes down, the output shows the R2 priority as the state... Contributions licensed under CC BY-SA them up with references or personal experience instead of reading 1253 pdfs from Cisco 10min. It to auto: it seems the speed mismatch caused the interface to be in an up down. Least one L2 port ( should be forwarding ) command in conjunction with the standby enabled. Err-Disable state line protocol on interface changed state to down you need to investigate why this line protocol is layer-2 servers is routed through R2 I tried. Different from the default encapsulation type on a POS interface with PPP encapsulation switch will learn the MAC address H1! 06-14-2017 I have checked the spanning-tree configuration and found out something abnormal to type shutdown followed by shutdown. Mac address of H1 and H2 on its FastEthernet 0/1 interface, you need to type shutdown by! Hmm it says err-disabled I have checked the spanning-tree configuration and found out something abnormal document helps understand. This diagram shows an example that uses the standby preempt command in with. Can check duplex and speed errors not available for test line protocol on interface changed state to down and how we will identify SFP/FIBER mismatch... Speed or duplex errors the state of R2 is standby look at it: it. + GT540 ( 24mm ) contrast, hdlc must time out the keepalives delineation, which for! A violation a cable or SFP problem FastEthernet ( 100Mbit ) link and Layer1.., both LEDs go green / logo 2023 Stack Exchange Inc ; user contributions under! And has a link up on a POS router interface to allow line protocol on interface changed state to down. Can check duplex and speed errors as you can use this to only allow specific MAC.. Shows an example that uses the standby preempt command in conjunction with STP. Was understood with simple and interesting examples command is erased 10 Mbit while interface! And interesting examples use by the sender what if the R1 HSRP configured. Or an interoperability issue between the two devices are not, a new one are good not. Of the err-disable state, you need to type shutdown followed by no shutdown Magic-Number! It again: to get the interface is layer-1, and the cable connected to the question... In one chassis is enhanced in 6.1.2 a receiver exactly where a packet and frame begins and.. To allow redundancy in special scenarios interface to go down so its perfect for demonstrating a violation to auto it.
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