Cisco Nexus 3k Route Selection\Packet Forwarding Debugging

Mon Apr 3 12:47:07 UTC 2023

It shows the desired result. 

----- 
Mike Hammett 
Intelligent Computing Solutions 
http://www.ics-il.com 

Midwest-IX 
http://www.midwest-ix.com 

----- Original Message -----

From: "Jay Hennigan" <jay at west.net> 
To: nanog at nanog.org 
Sent: Monday, April 3, 2023 1:02:42 AM 
Subject: Re: Cisco Nexus 3k Route Selection\Packet Forwarding Debugging 

On 4/2/23 22:21, Mike Hammett 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? 

Another route to the destination from a routing protocol with a lower 
distance? 

What does "show ip route [destination]" look like? 

-- 
Jay Hennigan - jay at west.net 
Network Engineering - CCIE #7880 
503 897-8550 - WB6RDV 

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