[e-nsp] ARP Pending Entries queue being maxed out

[Mikael Abrahamsson]

On Tue, 9 Sep 2014, Warwick Duncan wrote:

> Hello all
>
> We have a client with a two unit X450 stack with about 400 layer 3 VLAN
> interfaces and we are finding that the ARP Pending Entries queue
> increases to whatever the upper limit is set to.  We are also seeing
> that an apparently random selection of hosts connected to the switches
> becomes occasionally becomes unreachable, which would make sense given
> that the switch is unable to resolve ARP for them.
>
> This started being noticable at around 350 layer 3 VLAN but increasing
> the Pending Entries limit seemed to keep it in check for a while,
> although I guess that might have just lowered the number of complaints.
>
> Does anyone know if there is some known limitation with the X450 or XOS
> 12.4.1.7 that can cause this behaviour? Can the issue be resolved by
> using a different firmware version?
>
> Any other ideas for mitigating this problem?

How many active and pending arp entries do you have?

-- 
Mikael Abrahamsson    email: swmike at swm.pp.se