Transceiver and Switch Port Troubleshooting Through … cisco ethernet loopback test answerĮthernet Data Plane Loopback - Cisco Community Performing a loopback test on an Ethernet interface I am wondering if anyone has … cybercrimes act 19 of 2020 english The others work fine without any apparent problems.Ĭisco ethernet loopback test answer Solved: Loopback Test Failed, Please Help!! - Cisco Community Web1 Ethernet Data Plane Loopback pmlam3274 Beginner Options 06-21-2021 08:56 PM I need help on setting a loopback test for a ethernet router. When I issue the no shut command I receive the following error: "fa0/xx can't be brought up because it failed POST in loopback test." This is happening for ports 42 - 48. What is happening is that they appear to be administratively down.This can be achieved by using Ethernet Data plane loopback feature on NCS 500 … This particular functionality was introduced on Cisco NCS 500 and NCS 5500 series routers starting release IOS XR 7.1.x.L2VPN and Ethernet Services Configuration Guide for Cisco NCS … It must not be used by another interface on the router, and it must not be used by an. The IP address of a loopback interface must be unique across all routers on the network. In Cisco IOS XR Software, virtual loopback interfaces perform these functions: Loopback interfaces can act as a termination address for routing protocol sessions.Check the interfaces status to confirm the working status of all ports on the switch. At this step, you can examine whether the port and transceiver data rate are matching as well as the link is normal or not. Connect two transceivers with one duplex fiber cable or two loopback cables.Check out this blog post, which does an excellent job of explaining how to perform this type of testing. Just so that you're aware, if the intent of this test is to validate that all ports of a Nexus 9000 switch function as expected prior to deploying it into production, I've seen this type of testing called "snake testing", and there are other ways to perform it that may suit your needs. ) to one of the two physical interfaces, which should allow the ping to start working. You can work around this by statically assigning a non-BIA MAC address (e.g. To simplify a lot of complex technical details, the ASIC "doesn't like" receiving packets where the source and destination addresses are both BIA and tends to drop those packets. On modern Nexus 9000 series switches, this is needed so that the switch does not send a packet with the same source and destination MAC address, both of which are assigned to the switch as BIA (Burned-In Addresses). If the above accurately describes the "loopback testing" you are performing, then on modern Nexus 9000 series switches, you will most likely need to configure a unique, non-default static MAC address on at least one of the two physical interfaces. ping 192.0.2.2 vrf Blue and/or ping 192.0.2.1 vrf Red) to validate that the ports operate as expected. You are then pinging between the two interfaces (e.g. You are then assigning a unique VRF to each physical interface, then placing both physical interfaces in the same broadcast domain/subnet (for example, Ethernet1/1 in VRF Blue is assigned 192.0.2.1/24 and Ethernet1/2 in VRF Red is assigned 192.0.2.2/24). Based upon your configuration, when you say "loopback testing", I'm assuming you mean a scenario where you are looping back cables between two different physical interfaces of the same switch (for example, Ethernet1/1 connects to Ethernet1/2). There are a few different ways to perform loopback testing, depending on what you're trying to do. Switch# ping 10.10.10.2 source-interface loopback 0 Warning: Deleted all 元 config on interface Ethernet1/15 Warning: Deleted all 元 config on interface Ethernet1/13 Warning: Deleted all 元 config on interface loopback1 Warning: Deleted all 元 config on interface loopback0 Can anyone see where I may have left something out that would allow these two interfaces to successfully communicate? Previously I was getting the message "Destination Host Unreachable" so I've made progress, but it's still not quite right. I've been trying to establish a configuration for performing loopback testing and this is the closest I have gotten.
0 Comments
Leave a Reply. |