Cisco Nexus 3k Route Selection\Packet Forwarding Debugging

Mon Apr 3 05:35:43 UTC 2023

Is the BGP route getting installed into the rib?

On Mon, Apr 3, 2023, 01:24 Mike Hammett <nanog at ics-il.net> wrote:

> We have a Nexus 3064 that is setup with partial BGP tables and is routing
> based on that.
>
>
> I've done a show ip bgp for an IP of interest and it has an expected next
> hop IP. I show ip arp on that next hop IP and it has the expected interface.
>
>
>
> However, sFlows show the packets leaving on a different interface, the one
> that would carry the default route for routes not otherwise known.
>
>
> If the next hop IP is expected and the ARP of that next hop IP is
> expected, why are packets leaving out an unexpected interface?
>
>
>
> -----
> Mike Hammett
> Intelligent Computing Solutions
> http://www.ics-il.com
>
> Midwest-IX
> http://www.midwest-ix.com
>
>
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