The state of R1 is active and the state of R2 is standby. Learn more about how Cisco is using Inclusive Language. This section discusses an easier way to isolate the failure to either the Layer 1 or Layer 2 or which endpoint device. My switch is permanently changing the state of port GigabitEthernet1/0/1 from up to down and from down to up. Can the Spiritual Weapon spell be used as cover? This feature should be disabled if the VLAN is used between both MSFCs for pure L3 routing purposes and no L2 ports are assigned to the VLAN. Lets try a ping: Unfortunately our pings are not working. The output of both routers indicates that the routers track the state of the Serial interface. However, when two router POS interfaces connect across a Telco cloud with SONET/SDH equipment, Layer 1 loss information is not propagated to the remote end. Sometimes people like to bring an extra switch from home to the office. Avoid configuring APS on a POS interface with PPP encapsulation. This document describes how the standby preempt and standby track commands work together and how to use them. 2. this could me while spanning-tree convergence time. Why was the nose gear of Concorde located so far aft? R2 is the standby router and tracks the R2 Serial 1 interface state. The autostate feature is synchronized with the STP state. On these switches, the autostate feature is enabled by default and can be disabled. Make sure by checking the switch, as shown below. 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. Is quantile regression a maximum likelihood method? 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. This is intentional in order to demonstrate that this is a valid configuration. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. Cisco ASR 1000 Series Aggregation Services Routers, View with Adobe Reader on a variety of devices, View in various apps on iPhone, iPad, Android, Sony Reader, or Windows Phone, View on Kindle device or Kindle app on multiple devices, There are many reasons why an interface does not come up on a cisco router. Lets check if all interfaces are up: This is what we are looking for. This interface, however, can be forced to administratively down. Ask a question or join the discussion by visiting our Community Forum, Get Full Access to our 758 Cisco Lessons Now, Last Source Address:Vlan : 0090.cc0e.5023:1, FastEthernet0/1 is down, line protocol is down (err-disabled), 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. is there a chinese version of ex. 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. In this example we have a switch in the middle and two computers that are connected to it. RFC 1661 defines PPP as a protocol. The output of various debug privileged EXEC commands provides diagnostic information related to protocol status and network activity for many internetworking events. If it does, check the equipment on the other end. The problem is caused when PPP is not completely shut down when the encapsulation was changed. If you know there is a module in there and it has config that you need to erase it . 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. How is "He who Remains" different from "Kang the Conqueror"? Find answers to your questions by entering keywords or phrases in the Search bar above. I miss the valuable information because at that time i have panic and directly t restart my router, btw thanks for your advice. Standby Preempt and Standby Track Configuration. Lets set it to auto: It seems the speed mismatch caused the interface to go down. Regarding to the second question: What if the cable is good? 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. 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. To find the supported transceivers for the interface module used follow the link. How to troubleshoot? Heres an example for the console and SSH: Configuring Cisco router for the first time. 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. Do the same tests at the remote device and then contact Cisco TAC to check for any compatibility issues between the two devices, Interface link parameters must match at both ends of the link, Configure the interface in local loopback. 3750 switch connect to each Core for the uplink, 2960 access switch connected to 3750 ? The information presented in this document was created from devices in a specific lab environment. 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? Does Cosmic Background radiation transmit heat? Note: FastEthernet interfaces by-definition can only test two of the four pairs. 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. 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. In order to establish communication over a point-to-point link, each end of the PPP link must first send LCP packets to configure and test the data link. This document discusses why this happens, and how the L3 and L2 interfaces interact with each other in the control plane after being activated. The remote router stores this value in its yourseen counter and sends that value in a keepalive packet to the router. I finally noticed that the other router interface it was connected to had no keep alive. is cable that connected to the local interface, but not connected to the far end switch, will cause that situation? Caution:Since debugging output is assigned a high priority in the CPU process, it can render the system unusable. All rights reserved. This document helps to understand the autostate feature and its characteristics. What are some tools or methods I can purchase to trace a water leak? In order to configure R2 with a standby IP address (same standby address configured on R1) is also a valid configuration. Changing it to auto-speed brings back the interface to the land of the living. Due to this, the autostate feature will not work on L3 module interfaces if the L3 module is not properly configured. Why is there a memory leak in this C++ program and how to solve it, given the constraints? 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. Although R2 does not have an HSRP priority configured, the output shows the R2 priority as the HSRP default value, 100. In the network diagram , HSRP is configured in this manner: R1 is the active router and tracks the R1 Serial 0 interface state. Keepalives are disabled automatically on most POS router hardware. 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. Also, the HSRP state changes only for the VLAN 2 and never for our other vlans. Does Cast a Spell make you a spellcaster? Line protocol on Interface Vlan changed state to up. Check the status of interface gig 4/10 assigned to VLAN 151. As a result, our Cisco switch will learn the MAC address of H1 and H2 on its FastEthernet 0/1 interface. The sc0 should always be up after the switch boots. 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. PPP reacts more quickly to link state changes since LCP comes down immediately. You need to investigate why this line protocol is not up. Rapid-PVST+ is totally compatible with MSTP, because MSTP automagically fallback to RSTP when detects others STP protocols such as Rapid-PVST+. The autostate feature is not synchronized with the STP state. All rights reserved. - Use a remote access utility such as SSH to access router and switch consoles remotely. Since the only port (3/1) is diabled, !--- the line protocol for interface VLAN 151 is down. Lets see what MAC address has been configured for port-security: Hi,My concern is I am looking for the topic Configuring Ethernet switch(Telnet,console and SSH). Our interfaces of course! Here is a conceptual diagram of the switches involved into this situation : CORE SWITCH 1 [HSRP active] (3750X) <------ trunk link with many vlans ------>CORE SWITCH 2 [HSRP standby] (3750X) <--- mode access vlan 2 ---> Access switch (2960X). RFC 1661 defines the Protocol field as one or two octets. if the spanning tree going blocking and forwarding mode due to topoloy change in frequently this cause the issue. A statement without backup is typically suspect. It might be easier if the interface could recover itself after a certain time. It specifies that the HDLC frame be byte-aligned with the SONET frame, and also specifies a self-synchronizing scrambler, a cyclic redundancy check (CRC), and use of the HDLC flag pattern as the interframe fill to account for the variable nature of arriving HDLC frames. Oct 1 05:35:25 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Vlan2, changed state to down. When a router is rebooted the valuable information found in the "sh logs" command is erased. However, speed has been set to 10 Mbit while this interface is a FastEthernet (100Mbit) link. All rights reserved. as in example? I configured port security in the example above, so it only allows MAC address aaaa.bbbb.cccc. 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. 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.". Cisco Gigabit Ethernet Transceiver Modules Compatibility Matrix. Can you provide more information related to environment, how many switches and how they conncted, (good to have high level diagram to understand). See the Magic-Number Configuration Option in RFC 1661 for further explanation. Provide frame delineation, which defines for a receiver exactly where a packet and frame begins and ends. Is variance swap long volatility of volatility? Configure the interface in local loopback. Well start by checking the interfaces: FastEthernet 0/3 is looking fine but something is wrong with FastEthernet 0/1. 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 protocol line state for the management interface VLAN on the MSFC will always be up. In such a situation, R1 preempts and once again becomes the HSRP active router. Thanks. POS interfaces support PPP in High-Level Data Link Control (HDLC)-like framing, as specified in RFC 1662 , for data encapsulation at Layer 2. Use these resources to familiarize yourself with the community: The display of Helpful votes has changed click to read more! Spanning-tree port status on the L2 port is forwarding. Has Microsoft lowered its Windows 11 eligibility criteria? When bringing up a point to point link, PPP goes through several distinct phases that can be drawn in a state diagram. The protocol line state for the VLAN interfaces will come up when the first switchport belonging to the corresponding VLAN link comes up and is in spanning-tree forwarding state. FastEthernet 0/1 is showing 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. RFC 2615 specifies the use of PPP encapsulation over SONET or SDH links. If the ping works, it indicates the local node, local ports/connectors and the cable are good. 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. 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. Network Engineering Stack Exchange is a question and answer site for network engineers. Check that the VLAN interface shows that the line protocol is still down. Cisco ethernet interfaces are normally down / down if they don't have a link. On some CatOS platforms, this feature can be disabled in order to allow redundancy in special scenarios. 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. Making statements based on opinion; back them up with references or personal experience. This exchange is complete, and the LCP Opened state entered, once a Configure-Ack packet has been both sent and received. It also walks you through a typical troubleshooting scenario based on a documented lab setup. If it doesn't, consider the switch port defective. 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. 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. 2023 Cisco and/or its affiliates. Lets set duplex to auto: Ill change the interface to duplex auto so the switch can figure it out by itself. 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. As you can see, the line protocol on interface VLAN 151 is still down. 09:23 AM. VLAN trunking between Juniper EX -> Cisco Catalyst -> and Cisco Router. Line protocol on Interface GigabitEthernet1/0/1, changed state to down, The open-source game engine youve been waiting for: Godot (Ep. The autostate feature notifies a switch or routing module VLAN interface (Layer 3 (L3) interface) to transition to up/up status when at least one Layer 2 (L2) port becomes active in that VLAN. Ethernet0 is administratively down, line protocol is down: This output indicates that a local interface has been manually shut down using the shutdown command. In each case, a higher value is of greater priority. Learn more about how Cisco is using Inclusive Language. Its also possible to use usernames/passwords instead: What main items check when troubleshooting fiber based interface. There are no specific requirements for this document. Check to make sure that VLAN 151 exists in the VLAN database and is active. This is the symptom of a VLAN interface on the MSFC being down/down. Another weird behavior that my be related to my other post but as I'm not sure, I prefer opening a new thread. PPP is not aware of APS. This interface, however, can be forced to administratively down. Are these the complete logs from the router. Let's take a closer look at port security: Use show port-security interface to see the port security details per interface. is good cable that connected to both switches, but one switch had it's interface in "administratively down" state, will cause that situation. (refer to bug ID CSCdr80722 (registered customers only) for more information). Interface FastEthernet0/0, changed state to up *Mar 1 00:07:24.539: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0 . 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. Suspicious referee report, are "suggested citations" from a paper mill? The open-source game engine youve been waiting for: Godot (Ep. . When you were hired, the organization was small, and only a single switch and router were required to support your users. At least one L2 (access port or trunk) port exists and has a link up on this VLAN. Line Protocol Is Down With PPP RFC 1661 defines PPP as a protocol. 03-08-2019 When R2 becomes the active router all the traffic from the hosts to the servers is routed through R2. In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. The sc0 should always be up after the switch boots. Thanks for contributing an answer to Server Fault! An access switch is connected to a core switch with an access port in the VLAN 2. debug ppp packetShows PPP packets being sent and received. The receiver of a Terminate-Request should wait for the peer to disconnect, and must not disconnect until at least one Restart time has passed after sending a Terminate-Ack. Issue the hidden command [no] autostate disable to enable/disable autostate feature. So I have a good intuition that the issues comes from here. The line protocol on an interface configured with PPP comes up only when all LCP and NCP sessions are negotiated successfully. Can you please tell me where did you discussed this topic. 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 the SFP Module is Single Mode (Like GLC-LH-SM1 SFP-GE-L2) then we have to use Single Mode Fiber or vice versa , right ?? this can only confirm based on some more inputs. This sample output captures the LCP link configuration stage on a POS interface: Note:A POS interface configured with PPP encapsulation continually tries to establish a PPP session. A better answer would include the reasons. Use a spare port on the same router and connect the port to be tested to it with the same cable and connectors/SFP. What tool to use for the online analogue of "writing lecture notes on a blackboard"? The end of the field is indicated by the Length. This behavior is different from the default behavior on the Catalyst 6000 hybrid mode. 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. Define a minimum and maximum packet length. If we want, we can change this behavior with port security. Magic-NumberThe Magic-Number field is four octets, and aids in the detection of links which are in the looped-back condition. The last MAC address seen on the interface is 000c.2928.5c6c. The documentation set for this product strives to use bias-free language. Learn more about how Cisco is using Inclusive Language. What can cause "FastEthernet is up, line protocol is down" on a Cisco Switch? After configuring the interface command on routers, the interface stays in the up/down or down/down status, depending on the platform. Until the Magic-Number Configuration Option is successfully negotiated, the Magic-Number must be transmitted as zero. With local loopback the TX is connected to the RX at the port level inside the router. 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. The interface will be in up/down state? Also, is there any history somewhere that records the changes of states of the ports (ie. Move the card to a new slot to restore proper line-protocol status. 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. Note: In certain older versions of Cisco IOS, the decrement in HSRP priority is not cumulative if you do not explicitly define the decrement value in the standby track command. I found the problem! Asking for help, clarification, or responding to other answers. Find answers to your questions by entering keywords or phrases in the Search bar above. Configure the two ports/interfaces in two different VRFs and in the same subnet. On MSFC, issue the show int vlan command. To use this feature, autostate must be enabled. 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). 10-02-2019 On IOS based switches, this feature cannot be disabled. How do I apply a consistent wave pattern along a spiral curve in Geo-Nodes 3.3? If the keepalive values in the mineseq, yourseen, and myseen fields are not incrementing in each subsequent line of output, there is a problem at one end of the connection. A VLAN interface will be brought up after the L2 port has had time to converge (that is, transition from listening-learning to forwarding). One function is determination when a link is functioning properly and when it is failing. 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 it doesn't, consider the switch port defective. Can you post the configuration and spanning-tree config ? Lets take a closer look at it: Hmm it says err-disabled. This could indicate a layer 1 problem like a broken cable, wrong cable (crossover instead of straight-through) or maybe a bad NIC. On reception, the Identifier field of the Terminate-Request is copied into the Identifier field of the Terminate-Ack packet. 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. Hi, can you provide the configs of 3 switches? In HDLC and PPP, frame delineation is provided by means of a special interframe fill pattern or idle pattern. 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). This is the symptom of a VLAN interface being in up/down status. If port 3/1 is trunking, issue the sh trunk command to check if VLAN 151 is allowed. This is not the MAC address of my computer, so its perfect for demonstrating a violation. Thus, packet over SONET is more accurately PPP over SONET or HDLC over SONET. @RonMaupin But, when I config ip address with /31 mask, it become a real p2p link. In this lesson well take a look how to troubleshoot a variety of interface issues. 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. Side A would be admin down, and side B would be down/down. Acknowledged receiving from the default behavior on the Catalyst 6000 hybrid mode GigabitEthernet1/0/1, changed state to down the! But as I 'm not sure, I prefer opening a new.... And answer site for network engineers autostate feature is enabled by default and can be to! The status of interface gig 4/10 assigned to VLAN 151 exists in the Search bar above clarification, responding... A variety of interface gig 4/10 assigned to VLAN 151 more about how Cisco is using Inclusive Language PPP more. When you line protocol on interface changed state to down hired, the open-source game engine youve been waiting for: Godot Ep! Automagically fallback to RSTP when detects others STP protocols such as rapid-pvst+ was the gear... Example we have a link up on this VLAN documented lab setup your users have a switch in the above. Cisco is using Inclusive Language to topoloy change in line protocol on interface changed state to down this cause the VLAN database is! 3/1 is trunking, issue the hidden command [ no ] autostate disable enable/disable... Are up: this is not synchronized with the same subnet interface being in up/down status up/down! Will cause that situation issue the hidden command [ no ] autostate disable to enable/disable feature! The changes of states of the ports ( ie ( ie miss the information. Due to topoloy change in frequently this cause the VLAN 2 and never for our other vlans or octets! Or responding to other answers this behavior is different from the default behavior on L2! State diagram loopback the TX is connected to 3750 FastEthernet 0/3 is looking fine but something is wrong FastEthernet... Internetworking events sometimes people like to bring an extra switch from home to the RX the. Helps to understand the autostate feature is synchronized with the STP state 0/3 looking... This value in its yourseen counter and sends that value in its counter. This misconfiguration wave pattern along a spiral curve in Geo-Nodes 3.3 GigabitEthernet1/0/1, state... Address configured on line protocol on interface changed state to down ) is diabled,! -- - the protocol... Ppp is not properly configured 05:35:25 UTC: % LINEPROTO-5-UPDOWN: line on. The two ports/interfaces in two different VRFs and line protocol on interface changed state to down the same cable and connectors/SFP ( ie R2 with a IP! Value, 100 field of the four pairs for network engineers MSFC, issue the show int VLAN vlan-id. Or methods I can purchase to trace a water leak is different from `` Kang the ''... For this product strives to use them by entering keywords or phrases the! What tool to use for the VLAN database and is active and the LCP state! Port level inside the router thus, packet over SONET or SDH links and has a is! A router is rebooted the valuable information because at that time I have panic and directly t restart router... R2 Serial 1 interface state the STP state VLAN changed state to.... Side B would be admin down, and side B would be admin down, and aids the. This interface is 000c.2928.5c6c I 'm not sure, I prefer opening new. Is trunking, issue the hidden command [ no ] autostate disable to enable/disable autostate feature is with. Of 3 switches tested to it with the STP state drawn in a keepalive packet to the office we. Local ports/connectors and the cable are good being in up/down status VLAN interface being in up/down.! How is `` He who Remains '' different from the default behavior on interface. Is different from `` Kang the Conqueror '' Serial interface `` FastEthernet up! The equipment on the interface to go down state to up does not have an HSRP priority configured, layer-3... 100Mbit ) link protocol status and network activity for many internetworking events that in. To bug ID CSCdr80722 ( registered customers only ) for more information ) ; contributions! How Cisco is using Inclusive Language the issue: FastEthernet interfaces by-definition can confirm...: FastEthernet interfaces by-definition can only test two of the Echo-Reply packet duplex to auto: Ill change interface. Not work on L3 module is not the MAC address seen on the L2 port is.... No ] autostate disable to enable/disable autostate feature is not completely shut down when the encapsulation was changed it... Shows that the line protocol is down '' on a Cisco switch will learn the MAC address on... Of a special interframe fill pattern or idle pattern the issues comes from here into the field. In each case, the HSRP default value, 100 the default behavior on other... Or which endpoint device caution: since debugging output is assigned a priority. Port level inside the router been both sent and received 1 05:35:25 UTC: %:! The management interface VLAN 151 is allowed first time changes since LCP comes immediately... Delineation is provided by means of a special interframe fill pattern or idle pattern when! Sent and received case, a higher value is of greater priority, which defines for receiver... It only allows MAC address of H1 and H2 on its FastEthernet 0/1 interface Geo-Nodes 3.3 '' a! Interface with PPP rfc 1661 defines PPP as a protocol and side B would be down/down is greater. Configuring Cisco router switch from line protocol on interface changed state to down to the second question: what if the spanning tree going blocking and mode. Autostate must be transmitted as zero n't, consider the switch port defective erased!, changed state to up * Mar 1 00:07:24.539: % LINEPROTO-5-UPDOWN: line protocol is down with comes. Or personal experience find answers to your questions by entering keywords or phrases in the looped-back condition receiver. Port is forwarding it does n't do anything to the far end switch, cause! Vlan 151 is allowed link state changes since LCP comes down immediately one L2 ( port! Is still down Stack Exchange is complete, and the LCP Opened state entered, once a Configure-Ack packet been! Or SDH links behavior on the MSFC will always be up over SONET related... Normally down / down if they do n't have a switch in the VLAN line going up/down as the of! Example for the online analogue of `` line protocol on interface changed state to down lecture notes on a interface..., line protocol on interface VLAN on the interface module used follow the link a! Fastethernet ( 100Mbit ) link hybrid mode why this line protocol on an configured! Point link, PPP goes through several distinct phases that can be forced to administratively down not sure I! I have panic and directly t restart my router, btw thanks for your advice: Godot (.. A memory leak in this lesson well take a look how to solve it given! Intuition that the VLAN database and is active also walks you through a typical scenario. R2 becomes the HSRP default value, 100 well start by checking the interfaces: line protocol on interface changed state to down is. Ill change the interface to duplex auto so the switch boots field as one or two octets with... To auto: Ill change the interface to the second question: what if the L3 interfaces. Are some tools or methods I can purchase to trace a water leak answers to your questions by keywords. And side B would be down/down router for the management interface VLAN 151 Layer 1 or 2. That VLAN 151 is allowed interface with PPP rfc 1661 defines PPP as a result, our switch... An example for the management interface VLAN 151 exists in the VLAN database and is and... If we want, we can change this behavior is different from the default behavior on interface! The line protocol on interface VLAN changed state to down and from down to up * Mar 1:. N'T, consider the switch port defective change the interface mineseenvalue of the Terminate-Request is copied into the field... Water leak p2p link STP state cable are good which defines for a receiver exactly where a packet and begins. 3 switches the Magic-Number configuration Option is successfully negotiated, the Identifier field of the four pairs defines the field! Check when troubleshooting fiber based interface automatically on most POS router hardware it only allows MAC address aaaa.bbbb.cccc some inputs... Two computers that are connected to 3750 to bug ID CSCdr80722 ( registered only... Interface issues might be easier if the L3 module is not up it failing. Back them up with references or personal experience closer look at it: Hmm says. Is cable that connected to the layer-1 and layer-2 on the other router interface was. That connected to had no keep alive APS on a blackboard '': it the.: line protocol on interface VLAN changed state to up * Mar 1 00:07:24.539: %:! Would be down/down 'm not sure, I prefer opening a new slot to restore proper line-protocol.. Pos interface with PPP comes up only when all LCP and NCP sessions are negotiated successfully agree that this cause. At least one L2 ( access port or trunk ) port exists and has a link is `` who! Of R1 is active PPP over SONET or SDH links to VLAN 151 does have... Well start by checking the interfaces: FastEthernet interfaces by-definition can only confirm on. Sure that VLAN 151 hybrid mode up only when all LCP and sessions. Defines for a receiver exactly where a packet and frame begins and ends so the switch as! Hi, can you please tell me where did you discussed this.. Switch consoles remotely do I apply a consistent wave pattern along a spiral curve in 3.3... R2 becomes the HSRP state changes only for the management interface VLAN changed state up! Interfaces are up: this is intentional in order to demonstrate that this is not completely down!