Solved: MAC inconsistancy

wuh · ‎03-13-2009

hi,

we have a NTP server that is directly connected to one of our dist layer switch 6500. When I do a show ip arp, it gives me a MAC, but when I do a show mac- interface on that interface, it gives me a different MAC. How so? I mean, how can traffic deliver to that NTP server?

dsw2# sh ip arp 10.10.1.1

Protocol Address Age (min) Hardware Addr Type Interface

Internet 10.10.1.1 0 00a0.6901.60c8 ARPA FastEthernet5/2

dsw2#sh mac- int fa5/2

Legend: * - primary entry

vlan mac address type learn ports

------+----------------+--------+-----+--------------------------

* --- 0013.5fd7.ac0a static No Router

Thanks,

Han

Giuseppe Larosa · ‎03-13-2009

Hello Han,

this second entry is static:

or manually configured or part of port security configuration

vlan mac address type learn ports

------+----------------+--------+-----+--------------------------

* --- 0013.5fd7.ac0a static No Router

being static this MAC hasn't been learned on the port

learn = no

Hope to help

Giuseppe

View solution in original post

Giuseppe Larosa · ‎03-13-2009

Hello Han,

this second entry is static:

or manually configured or part of port security configuration

vlan mac address type learn ports

------+----------------+--------+-----+--------------------------

* --- 0013.5fd7.ac0a static No Router

being static this MAC hasn't been learned on the port

learn = no

Hope to help

Giuseppe

wuh · ‎03-13-2009

I just dug some more. Actually, the interface is configured with IP. This IP is the gateway of the subnet. The static MAC is the interface's.

Now, everything seems to be clear.

Thanks,

Han