[afnog] Difference between mac address on interface and mac address in the arp table

[Mark Tinka]

On 17/Mar/15 19:18, Christian M wrote:
> Hello.
> We are trying to set up an Ethernet over SDH link across multiple ADMs 
>  (from different vendors) linking on one end a cisco 6500 and on 
> another a cisco 4500. We have been successful in getting the MAC 
> address learned across the end points of the link.
>
> However on the c4500, the mac address learned is the one on the 
> physical interface of the c6500 (the same as the one on show 
> interface) which is different from the one on the arp table. I have 
> put the show command below on the c6500 which is on my end.
>
> GigabitEthernet4/14 is up, line protocol is up (connected)
>   Hardware is C6k 1000Mb 802.3, address is 0024.9798.3e25 (bia 
> 0024.9798.3e25)
>
>
> Protocol  Address          Age (min)  Hardware Addr   Type Interface
> Internet  10.10.10.2              - 0024.97d2.bf00  ARPA   
> GigabitEthernet4/14
> Internet  10.10.10.1              0   Incomplete      ARPA
>
> interface GigabitEthernet4/14
>  ip address 10.10.10.2 255.255.255.252
>
>
> I need help figuring out why the c4500 on the other end of the EoS 
> link is learning 0024.97d2.bf00 instead of 0024.97d2.bf00 (which is in 
> arp table) in how I can make this work.

Is the 4500 learning 0024.9798.3e25 or 0024.97d2.bf00?

Mark.
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