Arp Address for Cisco Stack 3750X different then I would expect

[Louis Adams]

Hi,

When ping the vlan ip address of the stack and then do an arp -a from windows PC.  The mac address I get is not listed as the mac address of the stack master or any member.  Here is the output of the show switch detail

HOC3750XCR1#show switch detail
Switch/Stack Mac Address : a493.4c78.8580
H/W Current
Switch# Role Mac Address Priority Version State
----------------------------------------------------------
*1 Master a493.4c78.8580 1 3 Ready
2 Member a493.4ca5.d200 1 3 Ready

However when do an arp -a the mac address i get when i ping the vlan 1 address is 

172.16.2.252          a4-93-4c-78-85-c0        dynamic

I would expect to get 8580 where is it getting the c0 addres from?

[Mark Malone · Accepted solution]

Hey

I wouldn't think you would get the stack mac from pinging the SVI , I would expect to get the mac address off the actual SVI interface as the layer 2 resolves to the layer 3 ip off that interface

What do you see if you do show int vlan x where that .252 ip is ,is the C0 mac in that output ?

Stack ports don't resolve to ip at all I thought its all at layer 2 level

[Louis Adams]

Mark,

Thanks for the answer, indeed when I do a show int vlan 1 the c0 is the mac.

Thanks again.

[Mark Malone]

No problem Louis glad its cleared up