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

[Vikas Sharma]

Hi,

in 7600 and 6500 router I can see both interfaces have the sme mac address.
Ideally it should be different. Can anyone explain me? Or can I use
(hardcode) different mac address? what will be the impact?

rtr1#
GigabitEthernet7/1 is up, line protocol is up (connected)
  Hardware is C6k 1000Mb 802.3, address is* 0021.5693.b800 (bia
0021.5693.b800)
*  Description: MPS GE CR2.ZRH ZRH/ZRH/LE-089348 // Uplink to  sw10.ZRH
Gi1/0/12
  Internet address is 212.74.70.7/31
  MTU 1512 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Carrier delay is 8 msec
  Full-duplex, 1000Mb/s, media type is LH
  input flow-control is off, output flow-control is off
  Clock mode is auto
  ARP type: ARPA, ARP Timeout 00:20:00
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/87/87 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 351000 bits/sec, 207 packets/sec
  5 minute output rate 844000 bits/sec, 483 packets/sec
  L2 Switched: ucast: 28994052 pkt, 4799234912 bytes - mcast: 8010577 pkt,
3281624827 bytes
  L3 in Switched: ucast: 630901927 pkt, 136197265827 bytes - mcast: 0 pkt, 0
bytes mcast
rtr2#sh inter gi7/13
GigabitEthernet7/13 is up, line protocol is up (connected)
  Hardware is C6k 1000Mb 802.3, address is* 0021.5693.b800 (bia
0021.5693.b800)*
  Description: MCL GE mas1.ZRH // x-link
  Internet address is 212.74.70.205/31
  MTU 1512 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Carrier delay is 8 msec
  Full-duplex, 1000Mb/s, media type is LH
  input flow-control is off, output flow-control is off
  Clock mode is auto
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 5000 bits/sec, 1 packets/sec
  5 minute output rate 6000 bits/sec, 1 packets/sec
  L2 Switched: ucast: 189399 pkt, 14697171 bytes - mcast: 6751962 pkt,
1745903975 bytes
  L3 in Switched: ucast: 1174 pkt, 189859 bytes - mcast: 0 pkt, 0 bytes
mcast

Regards,
Vikas Sharma