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Home > Archive > CCNP > January 2002 > MAC Address(es) of a router
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MAC Address(es) of a router
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| Bolero 2002-01-27, 7:59 pm |
| Does anyone know how to show the MAC address of a router?
I've done a sh ver :
Frankfurt#sh ver
Cisco Internetwork Operating System Software
IOS (tm) 2500 Software (C2500-D-L), Version 12.0(9), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2000 by cisco Systems, Inc.
Compiled Mon 24-Jan-00 22:06 by bettyl
Image text-base: 0x030387D0, data-base: 0x00001000
ROM: System Bootstrap, Version 11.0(10c)XB1, PLATFORM SPECIFIC RELEASE SOFTWARE (fc1)
BOOTFLASH: 3000 Bootstrap Software (IGS-BOOT-R), Version 11.0(10c)XB1, PLATFORM SPECIFIC RELEASE SOFTWARE (fc1)
Frankfurt uptime is 3 minutes
System restarted by power-on
System image file is "flash:c2500-d-l.120-9.bin"
cisco 2525 (68030) processor (revision J) with 6144K/2048K bytes of memory.
Processor board ID 08364117 , with hardware revision 00000000
Bridging software.
X.25 software, Version 3.0.0.
Basic Rate ISDN software, Version 1.1.
1 Token Ring/IEEE 802.5 interface(s)
2 Serial network interface(s)
1 ISDN Basic Rate interface(s)
Integrated NT1 for ISDN Basic Rate interface
56k 4-wire CSU/DSU for Serial Interface 0
5-in-1 module for Serial Interface 1
32K bytes of non-volatile configuration memory.
8192K bytes of processor board System flash (Read ONLY)
Configuration register is 0x2102
Is the Processor board ID the MAC address?
Also, can each interface on a router have a different MAC address?
Thanks!!  | |
| dmaftei 2002-01-27, 9:03 pm |
| quote:
Originally posted by Bolero
Does anyone know how to show the MAC address of a router?
A router does not have a mac address. Interfaces have mac addresses.
quote:
Is the Processor board ID the MAC address?
No. The processor id is a unique (in some scope) identifier for the processor on the main board of the router. Note that not all routers have a processor board id.
quote:
Also, can each interface on a router have a different MAC address?
Ethernet and Token Ring can, do, and should have different (presumably globaly unique) mac addresses. I don't know about Serial, BRI, ATM and other types, though... | |
| supergoku0 2002-01-28, 1:27 am |
| Specifically, "show arp" will show the MAC address of the installed interface cards provided they are not shut down.
Cheers,
Goku | |
| MadChef 2002-01-28, 5:10 am |
| show interface will show you the currently configured MAC address as well as the burned in address of LAN interfaces. Serial interfaces don't have a MAC address. For instances where the need one, IPX for example, they borrow the MAC of a LAN interface if there is one. Both serial and LAN interfaces can be configured with a different mac address with the mac-address command.
MadChef |
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