Archives for posts with tag: vPC

On a recent Packet Pushers podcast, use of the Peer-Gateway feature on the Nexus 7000 and whether it resolves the lack of support for L3 over vPC was briefly discussed. The whole topic has been quite a big source of confusion, so let’s answer it straight away: using Peer-Gateway to try and resolve L3 over vPC issues is not supported, but more importantly in most cases it doesn’t actually work. The question is, why not? There are actually two reasons. Read the rest of this entry »

The lack of support for running layer 3 routing protocols over vPC on the Nexus 7000 is well documented – less well known however is that the Nexus 5500 platform operates in a slightly different way which does actually allow layer 3 routing over vPC for unicast traffic. Some recent testing and subsequent discussions with one of my colleagues on this topic reminded me that there is still (somewhat understandably) a degree of confusion around this.

Let’s start with a reminder of what doesn’t work on the Nexus 7000:

L3-over-vPC-5Kvs7K1

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Virtual Port Channel (vPC) is a technology that has been around for a few years on the Nexus range of platforms. With the introduction of FabricPath, an enhanced version of vPC, known as vPC+ was released. At first glance, the two technologies look very similar, however there are a couple of differences between them which allows vPC+ to operate in a FabricPath environment. So for those of us deploying FabricPath, why can’t we just use regular vPC? Read the rest of this entry »