ipv6 eui-64 address

EdTheLad

How do i find my routers Mac address.
When i use the ipv6 address x::/64 eui-64 command the router generates the
eui-64 address from the routers mac address.I've been searching but i cant find where
the mac is specified.A basic question but its wrecking my head.

PCHoldmann

"Show interfaces" will show the MAC addresses on all ethernet interfaces. "sh ipv6 interface brief" shows the assigned EUI-64 addresses

Webmaster

I think he mean the base mac address of the router itself.

What you need Ed, is a cookie.


Run cookie in rommon, skip the first 4 characters, then the next 12 is the base mac address of the router itself burned into the mainboard at manufacturing.


rommon 1 > cookie

cookie:
01 01 00 04 c1 29 9c 40 43 20 00 ff 00 91 00 20
00 00 00 00 00 00 00 00 4a 41 44 04 51 30 4a 31
31 02 03 00 00 00 00 00 00 ff ff ff 60 06 49 0b
17 0d ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
rommon 2 >

EdTheLad

Thats great, thanks a million Johan!

EdTheLad

PCHoldmann wrote:

"Show interfaces" will show the MAC addresses on all interfaces ethernet interfaces. "sh ipv6 interface brief" shows the assigned EUI-64 addresses

"show interfaces" i wish
On my first read i was thinking the mac was taken from the actual interface, but i was wondering what happens with regard to the serial.After close inspection i realized the same interface-id is used for all interfaces which is created using the routers base mac address.

Webmaster

You're most welcome Ed

PCHoldmann

Ok, so I answered the wrong question...

Depending on the platform, this info may also be available the the show cXXXX (i.e. show c3600 on a 3600), show diag (3800), show catalyst6000 (6500), etc. I have noticed inconsistant output on these (show c1700 doesn't have it), results may vary.