[c-nsp] same mac address on two linecards on 7600

[Phil Mayers]

Tassos Chatzithomaoglou wrote:
> If i understand correctly, i think Vikas is referring to two linecards 
> (on different chassis) sharing a common mac.

Yes, but look what he pasted as the output:

GigabitEthernet7/1 is up, line protocol is up (connected)
   Hardware is C6k 1000Mb 802.3, address is 0021.5693.b800
   Internet address is 212.74.70.7/31

GigabitEthernet7/13 is up, line protocol is up (connected)
   Hardware is C6k 1000Mb 802.3, address is 0021.5693.b800
   Internet address is 212.74.70.205/31

i.e. they're in layer3 routed mode, and thus they inherit the MAC 
address of the MSFC (as the MSFC might have to receive packets, and the 
MSFC has a limited-size MAC filter)

If you set them back to be "switchport" they'll go back to having a 
per-port MAC address; I've just done this on our test chassis:

core-spare#sh int g9/10 | inc address
   Hardware is C6k 1000Mb 802.3, address is 0015.2cbf.1000 (bia 
0015.2cbf.1000)
core-spare#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
core-spare(config)#int g9/10
core-spare(config-if)#sw
core-spare(config-if)#switchport
core-spare(config-if)#^Z
core-spare#sh int g9/10 | inc address
   Hardware is C6k 1000Mb 802.3, address is 0021.55d7.558d (bia 
0021.55d7.558d)