[j-nsp] packet drop without ARP adjacency (fwd)

[Pekka Savola]

By the way,

How does Juniper (specifically, non-J-series) handle the case when 
ARP/ND is required to be resolved when you get a packet?  Are the 
packets discarded until the ARP succeed, or something else?  If 
discarded, is there a counter to how much of this occurs?

(If I'd have to guess, I'd say Next-Hop and/or Discard under 'show pfe 
statistics notification' might be a more general counter on this.)

---------- Forwarded message ----------
Date: Wed, 5 Oct 2005 10:07:09 +0300 (EEST)
From: Pekka Savola <pekkas at netcore.fi>
To: David Coulson <david at davidcoulson.net>
Cc: Gert Doering <gert at greenie.muc.de>, cisco-nsp at puck.nether.net
Subject: packet drop without ARP adjacency [Re: [c-nsp] IOS 12.2S Train]

On Tue, 4 Oct 2005, David Coulson wrote:
>> Normally, the SYN packet should cause an ARP entry to spring into
>> existance, and the second SYN sent by the machine on the other end will
>> then go through to the receiver.
>
> Wow, you're right - I can't believe I never noticed that. I just ran
> some packets across 12.2(29) and the first SYN gets dumped.

Speaking of which, is there a counter or a command to check how many
packets have been dropped waiting for ARP adjacency to come up ?

Is it 'RP PAS No Adjacency' and 'RP PAS Incomplete Adjacency' in "show
ip cef switching statistics" ?

-- 
Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings
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