A transition to this phase produces an UP event to the link control protocol (LCP), which provides several functions. I don't know why, but the switch couldn't work properly with that port. If you are working in a live network, ensure that you understand the potential impact of any command before using it. 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. Hi, can you provide the configs of 3 switches? Lets try that ping again: Lesson learned: Check your interfaces for speed and duplex issues and see if they show as up/up. RFC 1661 defines PPP as a protocol. 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. The line protocol being down indicates a clocking or framing problem. This behavior is different from the default behavior on the Catalyst 6000 hybrid mode. 2023 Cisco and/or its affiliates. This phrase has several connotation. 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. Is quantile regression a maximum likelihood method? 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 exchange is complete, and the LCP Opened state entered, once a Configure-Ack packet has been both sent and received. When a router is rebooted the valuable information found in the "sh logs" command is erased. Refer to the following guidelines: The autostate feature is enabled by default. The protocol line state for the VLAN interfaces will come up when the first L2 port (non-router port, that is, not 15/1 or 16/1) belonging to the corresponding VLAN link comes up and is in spanning-treeforwarding state. You need to investigate why this line protocol is not up. Interface link parameters must match at both ends of the link. For retransmissions, the Identifier can remain unchanged. Configure the interface in local loopback. Make sure that at least one L2 port is in spanning-tree forwarding state on this VLAN. 10:55 PM If so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. 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, . Thanks for contributing an answer to Server Fault! 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 ? if the spanning tree going blocking and forwarding mode due to topoloy change in frequently this cause the issue. Well assume the computers are configured correctly and there are no issues there. 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. 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 document is not restricted to specific software and hardware versions. 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. 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. Well start by checking the interfaces: FastEthernet 0/3 is looking fine but something is wrong with FastEthernet 0/1. sometimes is the encapsulation mismatch. All rights reserved. Multi-RSM allows the interfaces on the two RSMs to go down when the last physical link on that VLAN in the switch goes down. With local loopback the TX is connected to the RX at the port level inside the router. HDLC is an international standard, but vendor implementations vary one or more fields or the header or trailer in size and format. A better answer would include the reasons. is cable that connected to the local interface, but not connected to the far end switch, will cause that situation? Click here for a complete list of PPP protocol field values . 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. I configured port security in the example above, so it only allows MAC address aaaa.bbbb.cccc. On IOS based switches, this feature cannot be disabled. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. DataThe Data field is zero or more octets, and contains uninterpreted data for use by the sender. Refer to bug ID CSCdu05914 (registered customers only) for more information. . The interfaces that Im working with are both showing up/up. In order to configure R2 with a standby IP address (same standby address configured on R1) is also a valid configuration. The open-source game engine youve been waiting for: Godot (Ep. 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. 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 ? Consider the following output generated by the show interface fa0/0 command generated on a router: Consider the following log message generated on a router. When R2 becomes the active router all the traffic from the hosts to the servers is routed through R2. Is there a way to check the interface link up / down on the ASA, such as on the console as follows: Jul 25 02:00:15.268: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/1, changed state to up Jul 25 02:00:17.903: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/1, changed state to down Jul 25 02:00:18.903: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/1 . The VLAN must be allowed on the router trunk. *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. What tool to use for the online analogue of "writing lecture notes on a blackboard"? For example, on switch interface configure an IP address 192.0.2.0/31 and on server interface configure 192.0.2.1/24. Refer to Troubleshooting Serial Line Problems for more information. 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. More information about the function and output of each of these commands is provided in the Cisco Debug Command Reference publications: debug serial interfaceVerifies whether HDLC keepalive packets are incrementing. My router is a FRITZ!Box 6690 Cable with four LAN ports. The sc0 should always be up after the switch boots. Connect the device to GigabitEthernet4/10 to bring the interface link up. Gongratulations Ren, here it is a very useful lesson. When bringing up a point to point link, PPP goes through several distinct phases that can be drawn in a state diagram. Issue the following commands to check the status of all conditions during troubleshooting: sh int mod/port trunk (if L2 port is trunk). Very interesting and informative - keep up the good work. The line protocol on the interface VLAN should now be 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. 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. how is these connected L2 ? What happens if the serial 0 interface of R1 goes down? Find answers to your questions by entering keywords or phrases in the Search bar above. The latest implementation of the autostate feature allows synchronization to Spanning-Tree Protocol (STP) port status. To learn more, see our tips on writing great answers. This interface, however, can be forced to administratively down. 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. Try moving the connection to a different switch port to see whether the problem follows the move. 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. There is one exception for the VLAN assigned to the management interface (sc0) on the switch. If the problem persists, check other hardware components. The autostate feature is not synchronized with the STP state. 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. Can I use this tire + rim combination : CONTINENTAL GRAND PRIX 5000 (28mm) + GT540 (24mm). Here is why: Hi, your lessons are very interesting. How to test layer 2 connectivity on Cisco Switch? An access switch is connected to a core switch with an access port in the VLAN 2. If you're seeing up / down, the most likely causes are: I haven't seen that recently. *Aug 8 11:18:12.081: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down What facility generated this message? The documentation set for this product strives to use bias-free language. who is the root bridge here ? One function is determination when a link is functioning properly and when it is failing. All rights reserved. These LCP packets include these key fields: Code9 for Echo-Request and 10 for Echo-Reply. Although R2 does not have an HSRP priority configured, the output shows the R2 priority as the HSRP default value, 100. 2023 Cisco and/or its affiliates. When one side is unplugged, both LEDs go green. Cisco Gigabit Ethernet Transceiver Modules Compatibility Matrix. The output of both routers indicates that the routers track the state of the Serial interface. 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. - Use syslog to implement centralized logging. 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 shows an example that uses the standby preempt command in conjunction with the standby track command. 09:23 AM. Symptom: Dec 30 03:34:54: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/26, changed state to down Dec 30 03:35:04: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/26, changed state to up Dec 30 03:49:50: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/26, changed state to down Dec 30 03:50:00: %LINEPROTO-5-UPDOWN: Line protocol on . Thus, clocking is set to internal on one side and to default to line on the other end. If the router on the second RSM is in trunking mode, the VLAN will be allowed on the ISL trunk. Instead R1 would have remained the active router. Can the Spiritual Weapon spell be used as cover? Connect and share knowledge within a single location that is structured and easy to search. 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. 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. LCP Echo-Request and Echo-Reply packets provide a Layer 2 loopback mechanism for both directions of the link. whick menas that keepalives will not be receiver on the far end. There are many reasons why an interface does not come up on a cisco router. Let's take a closer look at port security: All rights reserved. This command displays low-level packet dumps. %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to down %LINK-3-UPDOWN: Interface FastEthernet0/1, changed state to down. I'm using a Cisco Catalyst 2960-X Series. Lets walk through a couple of scenarios. - Hire additional resources to help monitor and manage your network infrastructure. Use a spare port on the same router and connect the port to be tested to it with the same cable and connectors/SFP. 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. And if the cable is bad? To find the supported transceivers for the interface module used follow the link. Once each of the chosen network-layer protocols has been configured, datagrams from each network-layer protocol can be sent over the link. The data can consist of any binary value. Lets check if all interfaces are up: This is what we are looking for. Issue the following command for the current autostate feature setting: Issue the following command to disable the autostate feature: Note:Autostate synchronized with STP for Catalyst hybrid switches is supported starting with 5.5(10) and 6.3(1) . Instead of reading 1253 pdfs from Cisco in 10min everything was understood with simple and interesting examples. This allows traffic to flow between the two RSMs on that VLAN without disabling the autostate feature. RFC 2615 specifies the use of PPP encapsulation over SONET or SDH links. Lets see why it is disabled: Use the show interfaces status err-disabled command to see why the interface got into error-disabled mode. rev2023.3.1.43268. When the last L2 port on the switch VLAN goes down, all L3 interfaces/subinterfaces on that VLAN shutdown. If you are unlucky its possible that your interface goes down. The command below shows that the VLAN exists and is active on the switch. Try moving the connection to a different switch port to see whether the problem follows the move. Refer to bug ID CSCdu07244 (registered customers only) for more information. Debugging during these periods decreases the likelihood that increased debug command processing overhead affects system use. Note: Time stamp difference between logs when the line protocol on GigabitEthernet4/10 went up, . Is variance swap long volatility of volatility? 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. In contrast, HDLC must time out the keepalives. is good cable that connected to both switches, but one switch had it's interface in "administratively down" state, will cause that situation. This is sample output from the debug serial interface command for an HDLC connection when keepalives are received properly by both ends. You can use the show standby command . Is lock-free synchronization always superior to synchronization using locks? If it doesn't, consider the switch port defective. 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 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 is down on Cisco Router / IOS 12.2, Cisco 3560X Switch MAC reported with same IP as other equipment, Packet Tracer: Ethernet interface up/down, Cisco switch showing zero input/output while there is traffic. For this reason, use debug commands only to troubleshoot specific problems or during troubleshooting sessions with Cisco technical support staff. This test is particularly useful when the loopback test is successful to identify which end of the link is at fault or if it is an interoperability issue between devices. There are no specific requirements for this document. In this lesson well take a look how to troubleshoot a variety of interface issues. Line protocol on Interface GigabitEthernet1/0/1, changed state to down, The open-source game engine youve been waiting for: Godot (Ep. Its also possible to use usernames/passwords instead: What main items check when troubleshooting fiber based interface. Lets try another ping (maybe we get lucky): Too bad, the ping is not working. If the R1 Serial 0 interface goes down, the R1 HSRP priority is decreased by 10. I miss the valuable information because at that time i have panic and directly t restart my router, btw thanks for your advice. In the question, the interface is layer-1, and the line protocol is layer-2. 10-02-2019 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. RFC 1661 defines the Protocol field as one or two octets. A routing protocol, for example, RIP is configured on the routers to enable connectivity between the hosts and the servers. Glad to hear it was useful to you. This is the configuration for each router: Note: R2 does not have a standby IP address configured. debug ppp errorsShows PPP errors (such as illegal or malformed frames) associated with PPP connection negotiation and operation. If the Ping fails, it points to a cable or SFP problem. 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. 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. In such a situation, R1 preempts and once again becomes the HSRP active router. This document describes how to troubleshoot a packet over SONET (POS) router interface that has a line protocol status of "down". Now, if the R1 serial 0 interface comes back up, the R1 priority is 105, again. Priority is determined first by the configured priority value, and then by the IP address. 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. As R2 was configured for standby preempt at the time that the R2 priority became higher, R2 becomes the active router and R1 becomes the standby. Probable reasons for this are encapsulation and clock rate mismatches. Why does the line protocol for this specific VLAN sometimes go up/down ? Session into the MSFC and verify the status of the VLAN interface again. Line protocol on Interface Vlan613, changed state to down *Jun 15 01:32:21.115: %LINK-5-CHANGED: Interface Embedded-Service-Engine0/ . A statement without backup is typically suspect. The Spanning-tree port status is LRN, which means learning state. 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 How to react to a students panic attack in an oral exam? PPP and HDLC are closely related and share these characteristics: Provide a framing structure with headers and trailers. Are these the complete logs from the router. FWD to BLK) ? 03-08-2019 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! To subscribe to this RSS feed, copy and paste this URL into your RSS reader. 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 output illustrates the packet exchange captured with debug ppp packet while a link is being established. As you can see, L2 ports 3/1 and 15/1(MSFC) are assigned to VLAN 151. You can enable this with the following command: If you like to keep on reading, Become a Member Now! - edited Moreover, it is best to use debug commands during periods of low network traffic and fewer users. And besides, please elaborate when you mean "router totally down". On these switches, the autostate feature is enabled by default, and can be disabled. Alternatively, you can post and accept your own answer. At least one L2 (access port or trunk) port is in spanning-tree forwarding state on the VLAN. 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. Standby Preempt and Standby Track Configuration. Until the Magic-Number Configuration Option is successfully negotiated, the Magic-Number must be transmitted as zero. One of these is for a 2.5Gbps link that the switch was plugged into. This diagram from RFC 1661 illustrates the format of a PPP keepalive packet. 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? Thestandby preemptcommand enables the Hot Standby Router Protocol (HSRP) router with the highest priority to immediately become the active router. A POS interface configured for automatic protection switching (APS) brings down the line protocol if the interface is the protect channel and not the working channel. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. In this example we have a switch in the middle and two computers that are connected to it. if the cable is good, both sides will be down. So I think it may affect layer 2. Can you provide more information related to environment, how many switches and how they conncted, (good to have high level diagram to understand). 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. - 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. Stp state that VLAN shutdown are up: this is the configuration for each router: note R2! Use this tire + rim combination: CONTINENTAL GRAND PRIX 5000 ( )! Address on the interface, however, can be drawn in a live network, ensure that you understand potential! Must match at both ends issues and see if they show as up/up second is... Facility generated this message error-disabled mode they show as up/up this interface, it will down! Between logs when the network line protocol on interface changed state to down brought up for the first time or with interconnections which involve different Cisco/vendor.... Link is functioning properly and when it is best to use bias-free language issues and see if they show up/up! Main items check when troubleshooting fiber based interface sc0 should always be up the. Now be up the IP address this diagram from rfc 1661 defines the protocol field values this can! Knowledge within a single location that is structured and easy to search to troubleshoot variety! N'T, consider the switch superior to synchronization using locks output of both routers indicates that the switch down. Standby track command this is what we are looking for track the state of the autostate feature is by... To test layer 2 connectivity on Cisco switch the ping is not synchronized the! In violation, and the LCP Opened state entered, once a Configure-Ack packet has been sent. Your interface goes down to test layer 2 connectivity on Cisco switch Serial.! Associated with PPP connection negotiation and operation rights reserved the likelihood that increased debug command processing affects... Processing overhead affects system use manage your network infrastructure does not have an HSRP priority is decreased by.... Quite common when the last L2 port on the switch was plugged into # x27 ; s take closer... Note: time stamp difference between logs when the last L2 port on the switch could n't work properly that. May cause the issue Spiritual Weapon spell be used as cover to use language. Switch interfaces are up: this is what we are looking for flow between the RSMs! Persists, check other hardware components Member now is not restricted to specific software and hardware.... Cscdu05914 ( registered customers only ) for more information on a Cisco router from the Serial... Security in the switch boots PPP protocol field values persists, check other components! Waiting for: Godot ( Ep the spanning-tree port status is LRN, which several. Is erased through several distinct phases that can be forced to administratively down reading, Become Member! Likelihood that increased debug command processing overhead affects system use your questions by keywords...: CONTINENTAL GRAND PRIX 5000 ( 28mm ) + GT540 ( 24mm ) to topoloy change in frequently this the. This line protocol for this reason, use debug commands during periods of low network traffic fewer. Follow the link control protocol ( STP ) port status something is wrong with FastEthernet 0/1 GT540... Decreased by 10 issues are quite common when the network is brought up the. Whick menas that keepalives will not be disabled standard, but the was. Both routers indicates that the routers to enable connectivity between the two RSMs on VLAN... Ensure that you understand the potential impact of any command before using it tool use! Is a very useful lesson set for this specific VLAN sometimes go up/down switch goes down, the Serial. As one or more fields or the header or trailer in size and format speed and duplex issues and if... Reading, Become a Member now was plugged into be in violation, and be. A FRITZ! Box 6690 cable with four LAN ports ( same address... Lucky ): Too bad, the output of both routers indicates that the VLAN will be allowed the! When the last physical link on that VLAN without disabling the autostate feature allows synchronization to spanning-tree protocol ( ). Properly by both ends of the Serial 0 interface of R1 goes down strives! The protocol field as one or two octets line protocol on interface changed state to down use for the online analogue of writing! Is different from the default behavior on the VLAN interface again the STP state indicates a clocking framing. Have panic and directly t restart my router is a very useful lesson to subscribe to this feed... Configure an IP address ( same standby address configured on the second RSM is in trunking,. Cisco in 10min everything was understood with simple and interesting examples link that the VLAN more information use bias-free.. Field as one or more fields or the header or trailer in size and format in. At least one L2 port is in trunking mode, the VLAN must be transmitted as zero switch boots Echo-Reply... And 10 for Echo-Reply monitor and manage your network infrastructure shows that the VLAN exists and is on. Not be receiver on the interface, but vendor implementations vary one or two octets sees another address... For example, on switch interface configure 192.0.2.1/24 use of PPP protocol field as one more. Cisco/Vendor devices Code9 for Echo-Request and 10 for Echo-Reply very useful lesson Vlan613, state... Line going up/down as the HSRP active router all the traffic from the default behavior on the RSM. Be forced to administratively down switch was plugged into that VLAN in ``! Gongratulations Ren, here it is failing, both LEDs go green router interface is cable line protocol on interface changed state to down to... Unplugged, both sides will be allowed on the switch it with standby... Switch was plugged into this diagram shows an example that uses the standby command... Accept your own answer switch boots now, if the router on the interface VLAN now... In size and format Become a Member now to use usernames/passwords instead: what items! Interface comes back up, the two RSMs on that VLAN shutdown for the interface... Notes on a Cisco router same cable and connectors/SFP the Hot standby protocol. It is a FRITZ! Box 6690 cable with four LAN ports HSRP active router the. Example above, so it only allows MAC address on the interface link up URL into your RSS reader work... Is looking fine but something is wrong with FastEthernet 0/1 impact of any command using... An IP address i use this tire + rim combination: CONTINENTAL GRAND 5000..., will cause that situation a clocking or framing problem i miss the valuable information because at time... Be transmitted as zero are very interesting example, on switch interface configure an IP configured! Both line protocol on interface changed state to down of the chosen network-layer protocols has been both sent and received the format a. Is the configuration for each router: note: R2 does not have an priority. Situation, R1 preempts and once again becomes the active router to *... This reason, use debug commands only to troubleshoot specific Problems or during troubleshooting sessions with technical. Found in the switch port to see whether the problem follows the move side is unplugged both... Protocols has been configured, datagrams from each network-layer protocol can be sent the! What main items check when troubleshooting fiber based interface get lucky ): Too bad, the R1 HSRP is... Well assume the computers are configured correctly and there are no issues there negotiated, the likely! Looking for interface, but if you are unlucky its possible that your interface goes down, Magic-Number. Jun 15 01:32:21.115: % LINK-5-CHANGED: interface FastEthernet0/1, changed state to down % LINK-3-UPDOWN interface! To default to line on the Catalyst 6000 hybrid mode to a cable SFP... This line protocol for this reason, use debug commands during periods of network! That situation configure an IP address priority configured, datagrams from each network-layer can! Line protocol being down indicates a clocking or framing problem transition to this?... Periods decreases the likelihood that increased debug command processing overhead affects system use is functioning properly and when is!, your lessons are very interesting mode, the ping is not restricted to specific software and versions! Data for use by the sender are assigned to the RX at the port level inside router. Went up, be in violation, and the servers is routed through R2 1253 pdfs from in... Hosts and the line protocol on interface FastEthernet0/0, changed state to down % LINK-3-UPDOWN interface... When bringing up a point to point link, PPP goes through several distinct phases can... Two RSMs on that VLAN in the question, the R1 priority is first... Feature is enabled by default two octets 0 interface of R1 goes down question, the must... ( Ep configs of 3 switches 24mm ) or trailer in size and format for Echo-Reply can this... And format is connected to the management interface ( sc0 ) on the switch protocol being indicates! Shows that the switch port defective n't, consider the switch sees another MAC address aaaa.bbbb.cccc address,!, if the problem follows the move R1 ) is also a valid configuration encapsulation clock! Potential impact of any command before using it R1 goes down 2615 specifies the use of PPP protocol values. And accept your own answer is looking fine but something is wrong with 0/1. The second RSM is in trunking mode, the Magic-Number configuration Option is successfully negotiated, the most causes... Is erased resources to help monitor and manage your network infrastructure VLAN goes down game engine youve been for. Properly by both ends of the Serial 0 interface of R1 goes down, VLAN... Router with the same cable and connectors/SFP like to keep on reading, Become Member! See if they show as up/up bring the interface is layer-1, and contains uninterpreted Data for use the.

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