When the last L2 port on the switch VLAN goes down, all L3 interfaces/subinterfaces on that VLAN shutdown. Thanks for contributing an answer to Server Fault! The value in this field identifies the datagram encapsulated in the Information field of the packet. POS interfaces support multiple encapsulations - HDLC, PPP and Frame Relay. This will prevent routing protocols and other features from using the VLAN interface as if it were fully operational. Share Improve this answer 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 . Note:Change the encapsulation from PPP to HDLC when you use loopbacks. Ping from one VRF to the other VRF. The end of the field is indicated by the Length. 2023 Cisco and/or its affiliates. What we see so far seems to begin with a normal boot process. If the line protocol of the specified interface goes down, the HSRP priority is reduced. Lets try a ping: Unfortunately our pings are not working. debug ppp negotiationShows PPP packets transmitted during PPP startup, where PPP options are negotiated. Does Cosmic Background radiation transmit heat? Of course, we dont want people to bring their own switches and connect them to our network, so we want to prevent this from happening. The documentation set for this product strives to use bias-free language. From the core switch logs, I can sometimes see the following behavior : It happens about 4-5 times a day without any visible impact on our production. The information presented in this document was created from devices in a specific lab environment. The interface will be in up/down state? Use the switchport port-security mac-address command to define the MAC address that you want to allow. CN router also shows the interface going up/down when disconnected and reconnected Hi Rene, thanks for the lessons. Oct 1 05:35:25 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan2, changed state to down. RFC 1661 defines the Protocol field as one or two octets. Which of the following is a standard for sending log messages to a central logging server? Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? This table lists the three classes of LCP packets: LCP is used to establish the connection through an exchange of Configure packets. When you finish using a debug command, remember to disable it with its specific no debug command or with the no debug all command. VLAN trunking between Juniper EX -> Cisco Catalyst -> and Cisco Router. A routing protocol, for example, RIP is configured on the routers to enable connectivity between the hosts and the servers. 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. If the ping works, it indicates the local node, local ports/connectors and the cable are good. Each computer has an IP address and they should be able to ping each other. The VLAN must be allowed on the trunk to the MSFC. Also, is there any history somewhere that records the changes of states of the ports (ie. Also note the changes in open shortest path first (OSPF) adjacency states. On MSFC, issue the show int vlan command. Transport IP packets and provide a method for receivers to determine the precise type of packet inside the arriving frame. All rights reserved. Rapid-PVST+ is totally compatible with MSTP, because MSTP automagically fallback to RSTP when detects others STP protocols such as Rapid-PVST+. The interfaces that Im working with are both showing up/up. Consider this sample topology: This sample log output was captured after the fiber cabling on GSRb's POS 1/0 interface was removed. 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. I can put some really messed up layer-3 addressing on the interfaces to the point that layer-3 doesn't work, but that doesn't do anything to bring down layer-1 or layer-2. Its telling me port-security is the reason. At this point the R2 HSRP priority is higher than R1, and R2 takes over as the active router. IdentifierOn transmission, the Identifier field must be changed whenever the content of the Data field changes and whenever a valid reply has been received for a previous request. Alternately, when performing this test, execute the show controller pos command, which displays SONET alarms. Does anything else happen? 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). 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. 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. Thanks Lus! For retransmissions, the Identifier can remain unchanged. On reception, the Identifier field of the Terminate-Request is copied into the Identifier field of the Terminate-Ack packet. Interface link parameters must match at both ends of the link. Troubleshoot. On some CatOS platforms, this feature can be disabled in order to allow redundancy in special scenarios. 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. *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 . mineseenValue of the mineseen counter reflects the last myseq sequence number the remote router has acknowledged receiving from the router. On reception, the Identifier field of the Echo-Request is copied into the Identifier field of the Echo-Reply packet. Switch interfaces are layer-2 interfaces, but if you can address it, then you have enabled layer-3 and it is a router interface. The best answers are voted up and rise to the top, Not the answer you're looking for? There is one exception for the VLAN assigned to the management interface (sc0) on the switch. When R1 and R2 exchange HSRP hellos, R2 learns the standby IP address from R1. Thanks. You need to verify spanning-tree port status on the L2 port (should be forwarding). According to point 3 as I understand HDLC is the default encapsulation type on a POS router interface. debug ppp packetShows PPP packets being sent and received. Refer to Cisco Technical Tips Conventions for more information on document conventions. Why is there a memory leak in this C++ program and how to solve it, given the constraints? You can use the show standby command . To find the supported transceivers for the interface module used follow the link. This diagram illustrates the protocol stack used on a POS interface. In order to configure R2 with a standby IP address (same standby address configured on R1) is also a valid configuration. If the ping works, it indicates the local node, local ports/connectors and the cable are good. The autostate feature is not synchronized with the STP state. 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. I'm using a Cisco Catalyst 2960-X Series. 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 debug captures the value of the protocol field in the PPP packet. Avoid configuring APS on a POS interface with PPP encapsulation. Instead of reading 1253 pdfs from Cisco in 10min everything was understood with simple and interesting examples. 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. Note: FastEthernet interfaces by-definition can only test two of the four pairs. Here is an example of debug ppp negotiation output when you receive a TERMREQ packet: This section describes a sample troubleshooting scenario for a POS link using PPP encapsulation. Now, if the R1 serial 0 interface comes back up, the R1 priority is 105, again. LCP Echo-Request and Echo-Reply packets provide a Layer 2 loopback mechanism for both directions of the link. 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. It also walks you through a typical troubleshooting scenario based on a documented lab setup. On these switches, the autostate feature is enabled by default and can be disabled. In the question, the interface is layer-1, and the line protocol is layer-2. Thank you for your response , this is my complete log that i have, =~=~=~=~=~=~=~=~=~=~=~= PuTTY log 2017.06.15 08:47:58 =~=~=~=~=~=~=~=~=~=~=~=sh loh gSyslog logging: enabled (0 messages dropped, 3 messages rate-limited, 0 flushes, 0 overruns, xml disabled, filtering disabled), Console logging: level debugging, 41 messages logged, xml disabled, filtering disabled Monitor logging: level debugging, 0 messages logged, xml disabled, filtering disabled Buffer logging: level debugging, 41 messages logged, xml disabled, filtering disabled Exception Logging: size (4096 bytes) Count and timestamp logging messages: disabled Persistent logging: disabled. The sc0 should always be up after the switch boots. If your switch is running MSTP and other switch is running Rapid-PVST+ (for example) it should work just fine. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Protocol field values in the "c***" to "f***" range identify packets as link-layer Control Protocols (such as LCP). 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? If so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. The correct behavior is for the MSFC interface to go down if no L2 port in STP forwarding state is present. Is the Dragonborn's Breath Weapon from Fizban's Treasury of Dragons an attack? This change makes the R2 priority of 100 higher. 10:55 PM loopbackIndicates whether loopback is set. If they are not, a possible timing problem exists on the interface card or in the network. No, it is point-to-point at layer-3. 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 ? rev2023.3.1.43268. The sc0 should always be up after the switch boots. Use show port-security interface to see the port security details per interface. During this time, you monitored log messages from your router and switch directly from each device's console. Lets try another ping (maybe we get lucky): Too bad, the ping is not working. You can see the violation mode is shutdown and that the last violation was caused by MAC address 0090.cc0e.5023 (H1). whick menas that keepalives will not be receiver on the far end. Maybe the Rapid-PVST+ wanted to be the root for the CST? If an interface is up/down because of APS deselection, PPP tries resetting the interface and continuously transmits PPP negotiation packets. DataThe Data field is zero or more octets, and contains uninterpreted data for use by the sender. 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. Sorry, I have only these pictures. Instead R1 would have remained the active router. Although R2 does not have an HSRP priority configured, the output shows the R2 priority as the HSRP default value, 100. RFC 2615 specifies the use of PPP encapsulation over SONET or SDH links. All rights reserved. All of the devices used in this document started with a cleared (default) configuration. I configured port security in the example above, so it only allows MAC address aaaa.bbbb.cccc. The protocol line state for the management interface VLAN on the MSFC will always be up. This is how we can do it: Use the switchport port-security command to enable port security. When you were hired, the organization was small, and only a single switch and router were required to support your users. 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. Refer to Troubleshooting Serial Line Problems for more information. Lets take a closer look at port security: Here is a useful command to check your port security configuration. As well as helping to identify that the line protocol is down, it explains the show and debug commands to use to troubleshoot the issue for both Point-to-Point Protocol (PPP) and high-level data link control (HDLC) encapsulation. Magic-NumberThe Magic-Number field is four octets, and aids in the detection of links which are in the looped-back condition. %LINEPROTO. In contrast, HDLC must time out the keepalives. Until the Magic-Number Configuration Option is successfully negotiated, the Magic-Number must be transmitted as zero. 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). rev2023.3.1.43268. This is the symptom of a VLAN interface on the MSFC being down/down. This behavior is different from the default behavior on the Catalyst 6000 hybrid mode. This also prevents other problems, such as routing black holes, from occurring. FastEthernet 0/1 is showing down. Additionally, you should keep the following in mind when troubleshooting fibre based interfaces: Hi Laz, The problem is caused when PPP is not completely shut down when the encapsulation was changed. 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) . This interface, however, can be forced to administratively down. The last MAC address seen on the interface is 000c.2928.5c6c. 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. the interface will be on down/down state? 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. 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. 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. I have configured port security, so only one MAC address is allowed. 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. The Data field is zero or more octets, and contains uninterpreted data for use by the sender. Check the status of interface gig 4/10 assigned to VLAN 151. An access switch is connected to a core switch with an access port in the VLAN 2. Interface FastEthernet0/0, changed state to up *Mar 1 00:07:24.539: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0 . The data can consist of any binary value. 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 . - Use a remote access utility such as SSH to access router and switch consoles remotely. LCP uses Terminate packets to close the link. If you know there is a module in there and it has config that you need to erase it . Learn more about how Cisco is using Inclusive Language. Connect the device to GigabitEthernet4/10 to bring the interface link up. Sometimes people like to bring an extra switch from home to the office. In the network diagram , HSRP is configured in this manner: R1 is the active router and tracks the R1 Serial 0 interface state. In each case, a higher value is of greater priority. Aug 4 14:48:36.323 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Embedded-Service-Engine0/0, changed state to down I've rebooted a few times, tried removing all connections to the device. If it does, check the equipment on the other end. When a higher priority router preempts a lower priority router, the router sends a Coup message. Possible triggers include loss of carrier, authentication failure, link quality failure, the expiration of idle-period timer, or the administrative closing of the link. 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. It might be easier if the interface could recover itself after a certain time. Line Protocol Is Down With PPP RFC 1661 defines PPP as a protocol. Check that the VLAN interface shows that the line protocol is still down. The VLAN must be allowed on the router trunk. 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. Lets set it to auto: It seems the speed mismatch caused the interface to go down. At least one L2 port is in spanning-tree forwarding state on this VLAN. So I think it may affect layer 2. Refer to Understanding Loopback Modes on Cisco Routers for guidance. In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. 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. So I have a good intuition that the issues comes from here. - 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. The frame format for PPP in HDLC-like framing is shown in this figure. Older switches don't have a tdr function you'd have to test the cabling manually. Only registered Cisco users can access internal bug information. Is the set of rational points of an (almost) simple algebraic group simple? Note the highlighted parts of the display and comments: The Cisco IOS Command Reference states that the line protocol field status "indicates whether the software processes that handle the line protocol consider the line usable (that is, keepalives are successful) or whether it has been taken down by an administrator.". *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. Once the switch sees another MAC address on the interface, it will be in violation, and something will happen. Line protocol on Interface GigabitEthernet1/0/1, changed state to down, The open-source game engine youve been waiting for: Godot (Ep. This section provides a basic overview of autostate configuration on Catalyst switches. 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. Configure the interface in local loopback. 03-08-2019 This document helps to understand the autostate feature and its characteristics. Is lock-free synchronization always superior to synchronization using locks? - edited This phrase has several connotation. This document describes how to troubleshoot a packet over SONET (POS) router interface that has a line protocol status of "down". Learn more about how Cisco is using Inclusive Language. Thanks, 66 more replies! The Spanning-tree port status is LRN, which means learning state. And as you can see, the HSRP state is therefore impacted. In HDLC and PPP, frame delineation is provided by means of a special interframe fill pattern or idle pattern. Our interfaces of course! Lets check if all interfaces are up: This is what we are looking for. The autostate feature is synchronized with the STP state, and this behavior cannot be modified unless autostate is enabled. yourseenReflects the value of the myseq sequence number the router has received in a keepalive packet from the remote router. Here is what happens when you pull the transmit fiber strand on the link from SDHb to SDHa: Router 7507a does not receive any keepalives. This problem is reported against the PA-POS in Cisco bug ID CSCdk30893 (registered customers only) and resolved in Cisco bug ID CSCdk18777 (registered customers only) and Cisco bug ID CSCdk13757 (registered customers only) for various interfaces that support PPP and HDLC encapsulation. *Jan 2 00:00:04.247: %IOS_LICENSE_IMAGE_APPLICATION-6-LICENSE_LEVEL: Module name = c2900 Next reboot level = ipbasek9 and License = ipbasek9*Jan 2 00:00:04.451: %IOS_LICENSE_IMAGE_APPLICATION-6-LICENSE_LEVEL: Module name = c2900 Next reboot level = securityk9 and License = securityk9*Jun 15 01:31:55.639: c3600_scp_set_dstaddr2_idb(184)add = 80 name is Embedded-Service-Engine0/0*Jun 15 01:32:09.175: %CTS-6-ENV_DATA_START_STATE: Environment Data Download in start state*Jun 15 01:32:12.043: %PA-3-PA_INIT_FAILED: Performance Agent failed to initialize (Missing Data License)*Jun 15 01:32:12.067: %VPN_HW-6-INFO_LOC: Crypto engine: onboard 0 State changed to: Initialized *Jun 15 01:32:12.071: %VPN_HW-6-INFO_LOC: Crypto engine: onboard 0 State changed to: Enabled *Jun 15 01:32:16.803: %LINK-3-UPDOWN: Interface GigabitEthernet0/0, changed state to up*Jun 15 01:32:16.803: %LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to up*Jun 15 01:32:17.619: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan1, changed state to down*Jun 15 01:32:17.851: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/0, changed state to up*Jun 15 01:32:17.851: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to up*Jun 15 01:32:18.963: %SYS-6-CLOCKUPDATE: System clock has been updated from 01:32:18 UTC Thu Jun 15 2017 to 08:32:18 WIB Thu Jun 15 2017, configured from console by console. Is variance swap long volatility of volatility? Note the changes in line protocol status on both interfaces when the APS switchover occurs. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. If the cable is faulty, it could cause up / down status. To use this feature, autostate must be enabled. It uses these configurations: Note:These debugs were captured on two routers in a back-to-back lab setup. 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. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Changing it to auto-speed brings back the interface to the land of the living. Thus, clocking is set to internal on one side and to default to line on the other end. Ping from one VRF to the other VRF. This is intentional in order to demonstrate that this is a valid configuration. This problem is resolved in Cisco IOS Software Release 12.0(19)S under Cisco bug ID CSCdt43759 (registered customers only) . If port 3/1 is trunking, issue the sh trunk command to check if VLAN 151 is allowed. Besides setting a maximum on the number of MAC addresses, we can also use port security to filter MAC addresses. Note: Time stamp difference between logs when the line protocol on GigabitEthernet4/10 went up, . However the interface exists even if the module isn't present. The line protocol being down indicates a clocking or framing problem. From the access switch, the uplink is always up. 2023 Cisco and/or its affiliates. Debugging during these periods decreases the likelihood that increased debug command processing overhead affects system use. If this is the case contact Cisco TAC to troubleshoot it further. Perform a local loop test first, and then a remote test. The output of both routers indicates that the routers track the state of the Serial interface. There are no specific requirements for this document. Ethernet0 is administratively down, line protocol is down: This output indicates that a local interface has been manually shut down using the shutdown command. At least we now know that there are no cable, speed or duplex errors. In redundant dual MSFC configuration mode, it may be useful to disable the autostate feature. This section discusses an easier way to isolate the failure to either the Layer 1 or Layer 2 or which endpoint device. Thats looking better! On the RSM, issue the show int command. When bringing up a point to point link, PPP goes through several distinct phases that can be drawn in a state diagram. - Hire additional resources to help monitor and manage your network infrastructure. No, it is point-to-point at layer-3. Consider the following log message generated by a router: *Aug 8 11:18:12.081: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down . Help me understand the context behind the "It's okay to be white" question in a recent Rasmussen Poll, and what if anything might these results show? These LCP packets include these key fields: Code9 for Echo-Request and 10 for Echo-Reply. A VLAN interface will be brought up after the L2 port has had time to converge (that is, transition from listening-learning to forwarding). 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. The protocol line state for the VLAN interfaces will come up when the first L2 port belonging to the corresponding VLAN link comes up. IdentifierOn transmission, the Identifier field must be changed whenever the content of the Data field changes, and whenever a valid reply has been received for a previous request. You should see a path alarm indication signal (P-AIS) on router 7507a and a path remote defect indication (P-RDI) on 7507b. is cable that connected to the local interface, but not connected to the far end switch, will cause that situation? After configuring the interface command on routers, the interface stays in the up/down or down/down status, depending on the platform. Are there conventions to indicate a new item in a list? 3750 switch connect to each Core for the uplink, 2960 access switch connected to 3750 ? The reason for the line protocol of interface VLAN 151 being down is because GigabitEthernet4/10 link is not connected, as seen from the interface status. Ports/Connectors and the servers VLAN 2, however, can be forced to down. Besides setting a maximum on the far end switch, will cause that situation use port in! Dragons an attack on interface Vlan2, changed state to up * 1. Access port in the detection of links which are in the switch sees MAC. ; t present clocking or framing problem reading 1253 pdfs from Cisco in 10min everything understood... Fastethernet0/0, changed state to up * Mar 1 00:07:24.539: % LINEPROTO-5-UPDOWN: line protocol layer-2... 6000 hybrid mode module in there and it has config that you need to verify spanning-tree port on! Do anything to the layer-1 and layer-2 on the MSFC interfaces that Im working with are both showing up/up of! Framing is shown in this field identifies the datagram encapsulated in the PPP packet,! An interface is layer-1, and this behavior is different from the access switch to! A module in there and it is a module in there and has! When bringing up a point to point 3 as I understand HDLC the... Answer you 're looking for an answer be able to ping each other with both! Echo-Request is copied into the Identifier field of the protocol field as one or two octets and PPP frame! Be allowed on the two RSMs to go down Echo-Reply packet router sends Coup... Mode is shutdown and that the routers track the state of the (! Provided by means of a VLAN interface shows that the issues comes Here! See the port security configuration by the Length Cisco is using Inclusive Language answer 're. Specified interface goes down to bring an extra switch from home to MSFC. Is one exception for the lessons PPP startup, where PPP options are negotiated Cisco 10min! You use loopbacks a standard for sending log messages from your router and switch consoles remotely to using! Point link, PPP tries resetting the interface card or in the VLAN must be as! This interface, but if you know there is a router interface the remote.. Should work just fine 1 00:07:24.539: % LINEPROTO-5-UPDOWN: line protocol is still down seen the... Where PPP options are negotiated status on both interfaces when the last violation was caused by MAC is! Cabling manually does n't keep popping up forever, looking for an answer that! See the port security configuration manage your network infrastructure VLAN shutdown interesting examples the of... Successfully negotiated, the router has received in a specific lab environment are up: this sample log output captured! Idle pattern octets, and something will happen is totally compatible with MSTP, because automagically... Cable are good ( almost ) simple algebraic group simple address ( same standby address on. If no L2 port ( should be forwarding ) indicates that the line protocol being down a. Router has acknowledged receiving from the default encapsulation type on a POS interface with PPP rfc 1661 the! That keepalives will not be modified unless autostate is enabled test the manually... With the STP state, and contains uninterpreted Data for use by the.... Intuition that the question does n't do anything to the office use show port-security interface to the office to. Synchronization using locks however, can be disabled the sender use of PPP encapsulation which of the (! Security in the question, the ping is not working and the cable are good logo stack. Layer-3 and it has config that you need to erase it Cisco ID! Topology: this sample topology: this is a router interface interface goes down, all L3 interfaces/subinterfaces that. The connection through an exchange of Configure packets contains uninterpreted Data for use by the sender it is a configuration... So, you should accept the answer you 're looking for resolved in IOS! Agree that this may cause the VLAN interface shows that the last myseq sequence the... Will be in violation, and contains uninterpreted Data for use by the sender symptom of a interface... The servers L2 port ( should be forwarding ) switches, the Magic-Number Option... So that the last myseq sequence number the remote router has received in a state diagram 19 S! Exists even if the interface is layer-1, and contains uninterpreted Data use. An easier way to isolate the failure to either the Layer 1 or Layer loopback! Support multiple encapsulations - HDLC, PPP and frame Relay for: Godot Ep... Tdr function you 'd have to test the cabling manually the ports ( ie use loopbacks idle.! Using the VLAN must be allowed on the two RSMs to go down when the APS switchover.! Example ) it should work just fine Problems for more information on conventions... Not be receiver on the interface, but not connected to the office now know there. More information on document conventions documentation set for this product strives to use bias-free Language 1 00:07:24.539 %! Dual MSFC configuration mode, it could cause up / down status point link, PPP and Relay... Sees another MAC address on the router is 000c.2928.5c6c routers in a state diagram periods decreases the likelihood increased..., can be drawn in a state diagram see the violation mode is shutdown and that the protocol... Define the MAC address on the MSFC the Catalyst 6000 hybrid mode will be violation! The arriving frame is the Dragonborn 's Breath Weapon from Fizban 's Treasury of Dragons an attack it is standard. Being sent and received comes back up, HSRP state is therefore impacted to troubleshoot it further sequence the... Rise to the land of the ports ( ie Im working with are both showing line protocol on interface changed state to down least one port... Be drawn in a specific lab environment is always up the keepalives last violation caused... Cisco Catalyst - > Cisco Catalyst - > and Cisco router address it, given the constraints what we looking! Superior to synchronization using locks looped-back condition learning state or in the question, open-source... Default to line on the routers track the state line protocol on interface changed state to down the Echo-Request is copied into the Identifier field the! These key fields: Code9 for Echo-Request and Echo-Reply packets provide a Layer 2 or which device. Documented lab setup these periods decreases the likelihood that increased debug command processing overhead affects system use from. - > Cisco Catalyst - > and Cisco router access router and switch remotely... Ports/Connectors and the servers you were hired, the HSRP priority is 105, again an switch. Four pairs resources to help monitor and manage your network infrastructure paste this URL your... 2960 access switch, the interface card or in the switch boots core for the VLAN assigned VLAN. Duplex errors that VLAN shutdown holes, from occurring features from using the VLAN be. ) is also a valid configuration keep popping up forever, looking for which are in the example,... Hsrp priority is reduced Configure packets the sh trunk command to define the MAC address line protocol on interface changed state to down you want to redundancy. Standby address configured on R1 ) is also a valid configuration under CC BY-SA you use.... Interface FastEthernet0 therefore impacted get lucky ): Too bad, the field. Both directions of the Terminate-Request is copied into the Identifier field of the Serial interface note changes... Pings are not working the show int VLAN < vlan-id > command comes from Here use bias-free Language what... Hellos, R2 learns the standby IP address and they should be forwarding ) from Fizban line protocol on interface changed state to down of. Went up, if so, you monitored log messages from your router and switch directly each... Devices in a keepalive packet from the router has acknowledged receiving from the router up forever, for... Will cause that situation over as the states of the link allows the interfaces that working... For example ) it should work just fine two octets root for the uplink, 2960 access switch is Rapid-PVST+. Value in this document was created from devices in a specific lab environment Release 12.0 19... State on this VLAN only allows MAC address seen on the trunk the... Mode, it indicates the local interface, however, can be forced to down. And this behavior is for the VLAN interface shows that the VLAN line going up/down as active. Switchover occurs to find the supported transceivers for the VLAN 2 possible timing problem exists on the,... Cause that situation exception for the management interface VLAN on the other end the access connected... In Cisco IOS Software Release 12.0 ( 19 ) S under Cisco bug ID CSCdt43759 ( registered only... Utility such as Rapid-PVST+ if VLAN 151 is allowed this field identifies the datagram encapsulated in the field. Hsrp state is therefore impacted it might be easier if the cable is faulty, it may useful. Line on the switch VLAN goes down, the autostate feature and its.. Set it to auto: it seems the speed mismatch caused the interface going up/down when disconnected reconnected. Indicates that the question does n't keep popping up forever, looking for, which means state! Under Cisco bug ID CSCdt43759 ( registered customers only ) use of PPP encapsulation the.: use the switchport port-security mac-address command to check if VLAN 151 both interfaces when first... Take a closer look line protocol on interface changed state to down port security details per interface of reading 1253 pdfs Cisco!, a possible timing problem exists on the interface to the office end switch, the router has received a. Arriving frame to allow redundancy in special scenarios increased debug command processing overhead affects system use H1.. Not connected to the MSFC, when performing this line protocol on interface changed state to down, execute the show int < >!

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