LAN - ARP Table

Unanswered Question
Sep 14th, 2005
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Hello,

I'm not sure if someone has come across this before. But they might enlighten me.


Under what circumstances would you see ARP enteries on a switch for subnets out side of the local subnet?


Example 2 switches back to back everything in default vlan 1. These uplink to a pair of routers running HSRP.


I would expect to see x.x.x.200 /24

arp enteries for devices on the switches

but not addresses outside of this range.


Any input appreciated.


Thank you.

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lgijssel Wed, 09/14/2005 - 22:24
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Suppose you are talking layer2 switches like the 2950 series?

First of all, this has nothing to do with the switching process on the access ports. The arp table on a switch is only used for the IP management interface. ARP entries will appear for anything that you contact from the console.

Typically anything beyond your local subnet is covered by a default gateway but when the switch is using proxy-arp for address resolution you can see anything on your network.


Regards,

Leo

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