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.
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