Ah okay, I suppose I was confused because I didn't configure bfd echo on the 
Nexus side and it's not anywhere in the configuration on the device.


-----Original Message-----
From: Gert Doering <[email protected]> 
Sent: Monday, January 18, 2021 4:26 PM
To: Drew Weaver <[email protected]>
Cc: '[email protected]' <[email protected]>
Subject: Re: [c-nsp] NXOS BFD sends packets sourced and destined for it's own 
IP address to the remote host.

Hi,

On Mon, Jan 18, 2021 at 08:15:02PM +0000, Drew Weaver wrote:
> I can really easily resolve this by just adding another line to the ACL but I 
> would much rather understand how this traffic is ending up on the wire in the 
> first place.

By being sent out, to be returned by the other end "if its IP forwarding engine 
is working" - BFD echo mode

  https://netcraftsmen.com/clarifying-bfd-and-bfd-echo/

gert
--
"If was one thing all people took for granted, was conviction that if you  feed 
honest figures into a computer, honest figures come out. Never doubted  it 
myself till I met a computer with a sense of humor."
                             Robert A. Heinlein, The Moon is a Harsh Mistress

Gert Doering - Munich, Germany                             [email protected]
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