keith,
 clearing the arp doesnt matter at all and it will not affect ur routing
table and the
arp request will propagate fast on ur switch.

fyi..
/jack


""Keith Woodworth""  wrote in message
news:200211010355.DAA27930@;groupstudy.com...
> We have a Cat5500 with an odd problem. There is a customer with a Vlan
> setup on 2 RSM's using HSRP. The Vlan is using a /29, with each RSM
> assigned an IP from the /29, a default gateway from the /29 which leaves
> 3 usable IP's for the customer.
>
> He has 2 devices plugged into 2 ethernet ports on the Cat5500, a Redback
> and a 3640, each has an IP from the /29, leaving one more to use. He wants
> to add a switch, so config the switch to use the last IP from the /29,
> assign the port to the Vlan and the switch should be accessable.
>
> I'm telnetted to the console of the switch and I can ping the 3640 and the
> Redback ok, but not the switch. A ping to the customers switch wants to go
> out an IP on an interface that does not exist and has not existed for a
> looong while.
>
> A show arp below shows two entries on the same port/vlan. 204.244.98.19
> should not be there. I'd like to do a clear ARP on the console so that it
> will remove the old entry but should it have not removed it by now? We
> changed things over over year ago taking out the 98.19 address.
>
> My question though lies in what affect clearing the ARP table on the
> console will have on overall routing? Its just on the console of a
> Catalyst 5500, not on the RSM's. 64.114.55.67 is the gateway for Vlan1
> which is the management Vlan for the RSM's.
>
> How quick does the ARP table get repopulated?
>
> Cisco 5500> (enable) sh arp
> ARP Aging time = 1200 sec
> 64.114.55.67                              at 00-00-0c-07-ac-01 port 3/1 on
> vlan 1
> 204.244.98.19                             at 00-00-0c-07-ac-01 port 3/1 on
> vlan 1
>
> Thanks,
> Keith




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