line protocol on interface changed state to down
Other important fields in the show interface pos output are: EncapsulationEncapsulation method assigned to the interface. 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 ? (Refer to the APS Technology Support Page for more information.). The Data field is zero or more octets, and contains uninterpreted data for use by the sender. 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? 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. Here is why: Hi, your lessons are very interesting. 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. Ping from one VRF to the other VRF. This table lists the three classes of LCP packets: LCP is used to establish the connection through an exchange of Configure packets. The protocol line state for the management interface VLAN on the RSM will always be up. 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. Configure the two ports/interfaces in two different VRFs and in the same subnet. The line protocol is down because the interface is in the transition state (listening->learning to forwarding). The interfaces that Im working with are both showing up/up. When R1 is the active router all the traffic from the hosts (Host 1, 2, 3) to the servers is routed through R1. debug ppp packetShows PPP packets being sent and received. Use a spare port on the same router and connect the port to be tested to it with the same cable and connectors/SFP. Its telling me port-security is the reason. Keep in mind that a Gigabit interface doesnt support half-duplex. loopbackIndicates whether loopback is set. Line protocol on Interface Vlan613, changed state to down *Jun 15 01:32:21.115: %LINK-5-CHANGED: Interface Embedded-Service-Engine0/ . rev2023.3.1.43268. ASR 1000 Series Aggregation Services Routers. There are no specific requirements for this document. 09:23 AM. The data may consist of any binary value. 03-08-2019 Why does the line protocol for this specific VLAN sometimes go up/down ? Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. And as you can see, the HSRP state is therefore impacted. Are there conventions to indicate a new item in a list? Alternatively, you can post and accept your own answer. 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. 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. 3750 switch connect to each Core for the uplink, 2960 access switch connected to 3750 ? What are some tools or methods I can purchase to trace a water leak? 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. Jordan's line about intimate parties in The Great Gatsby? Very interesting and informative - keep up the good work. Configure the interface in local loopback. All of the devices used in this document started with a cleared (default) configuration. I mean that question No. According to point 3 as I understand How to troubleshoot? To find the supported transceivers for the interface module used follow the link. For these switches, the autostate feature is enabled by default. 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. Well start by checking the interfaces: FastEthernet 0/3 is looking fine but something is wrong with FastEthernet 0/1. Lets try a ping: H1 is unable to ping H2. Moreover, it is best to use debug commands during periods of low network traffic and fewer users. 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. When you were hired, the organization was small, and only a single switch and router were required to support your users. Does anything else happen? You should see a path alarm indication signal (P-AIS) on router 7507a and a path remote defect indication (P-RDI) on 7507b. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. The frame format for PPP in HDLC-like framing is shown in this figure. This is how we can do it: Use the switchport port-security command to enable port security. If it does, check the equipment on the other end. I found the problem! This diagram from RFC 1661 illustrates the format of a PPP keepalive packet. sometimes is the encapsulation mismatch. This document is not restricted to specific software and hardware versions. Was Galileo expecting to see so many stars? 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. 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. Avoid configuring APS on a POS interface with PPP encapsulation. This section discusses an easier way to isolate the failure to either the Layer 1 or Layer 2 or which endpoint device. if the cable is good, both sides will be down. 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. Hi Rene, thanks for the lessons. Refer toCisco Technical Tips Conventions for more information on document conventions. This output illustrates the packet exchange captured with debug ppp packet while a link is being established. Network Engineering Stack Exchange is a question and answer site for network engineers. And if the cable is bad? How to test layer 2 connectivity on Cisco Switch? 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. All rights reserved. Lastly, both routers are configured with the standby preempt command. 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. Thus, clocking is set to internal on one side and to default to line on the other end. The line protocol being down indicates a clocking or framing problem. If we want, we can change this behavior with port security. Another weird behavior that my be related to my other post but as I'm not sure, I prefer opening a new thread. 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. Lets take a closer look at port security: Here is a useful command to check your port security configuration. Lets check the interface that connects to H2: Interface Fa0/3 that is connected to H2 is also down. Making statements based on opinion; back them up with references or personal experience. Since the only port (3/1) is diabled, !--- the line protocol for interface VLAN 151 is down. who is the root bridge here ? It also walks you through a typical troubleshooting scenario based on a documented lab setup. How is "He who Remains" different from "Kang the Conqueror"? There are no specific prerequisites for this document. Besides setting a maximum on the number of MAC addresses, we can also use port security to filter MAC addresses. Is quantile regression a maximum likelihood method? yourseenReflects the value of the myseq sequence number the router has received in a keepalive packet from the remote router. All of the devices used in this document started with a cleared (default) configuration. All rights reserved. Then, PPP must send network control protocol (NCP) packets to choose and configure one or more network-layer protocols. If the R1 Serial 0 interface goes down, the R1 HSRP priority is decreased by 10. 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? Regarding to the second question: What if the cable is good? It is possible that no device is connected to the interface or that the link has cabling or auto-negotiation issues preventing the link from being up. For example, on switch interface configure an IP address 192.0.2.0/31 and on server interface configure 192.0.2.1/24. 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. If this is the case contact Cisco TAC to troubleshoot it further. Switch interfaces are layer-2 interfaces, but if you can address it, then you have enabled layer-3 and it is a router interface. Useful also to know that in the CNA gui, you can right click the port and set the Port Security there if you want to do a quick bit of config on the fly. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. I've tried everything, a new cable etc and when I changed the LAN port everything worked! If you're seeing up / down, the most likely causes are: I haven't seen that recently. This is not the MAC address of my computer, so its perfect for demonstrating a violation. Session into the MSFC and verify the status of the VLAN interface again. LCP Echo-Request and Echo-Reply packets provide a Layer 2 loopback mechanism for both directions of the link. In my case, use different prefix length can cause this problem. Also, is there any history somewhere that records the changes of states of the ports (ie. The pattern is 0x7E, or 0111 1110. Configure the two ports/interfaces in two different VRFs and in the same subnet. As you can see, it is now down. Now, if the R1 serial 0 interface comes back up, the R1 priority is 105, again. Refer to Cisco Technical Tips Conventions for more information on document conventions. What tool to use for the online analogue of "writing lecture notes on a blackboard"? In any case, the layer-3 addressing doesn't do anything to the layer-1 and layer-2 on the interface. 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. how is these connected L2 ? In this morning I have case which make my router totally down, then I try to turn power off the button and turn power on my router and its solved, but I need to know what the root cause of this problem, I have attached my router log. Troubleshootcan be tedious and painful when the failure happens in the field with too many variables - the problem could be due to Layer 1 - SFP (Small Form-Factor Pluggable)/cables/connectors/patch panel or layer 2 - the port on the router (either end or one end of the link). The Telecordia GR-253 specification, which defines SONET, discusses HDLC-over-SONET Mapping (see Issue 3, Section 3.4.2.3, pp.3-59.) On MSFC, issue the show int vlan
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