[c-nsp] Cisco 6509 and ARPs

[John Kristoff]

On Fri, 18 Feb 2005 17:28:41 -0500
Rodney Dunn <rodunn at cisco.com> wrote:

> > It appears that Cisco does not update the ARP cache table unless it
> > specifically issues an ARP (and possibly, but I've not confirmed via
[...]
> I don't think that's true and I just tested it:

Ah, that does seem to be the case.  I had only assumed that was the
case based on some ARP entries I had that were old, but where the hosts
were still active.  I've run a similar test and verified what you found.
Apparently there are a number of hosts that do not issue ARPs as often
as I thought.

> I can tell you that setting the arp timeout low with a large
> number of arp entries (2k in general or more) will possibly
> cause you problems.  If your timers get in sync when you try
[...]

Thanks Rodney,

John