Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

Link-local address on serial interface

Hi to all,

i was no able to understand how you can get a link-local address on a serial link.

I'm studying OSPFv3 and  serial interface of my router shows:

link-local address is FE80::9CD7:2EFF:FEF0:99FA

I know that has been used MAC address, but which MAC address? How can verify mac address of my router that is equipped with only 4 serial port (emulation using GNS3)?

Thanks a lot....

4 REPLIES
Cisco Employee

Link-local address on serial interface

Hi Fabio,

From this link: http://www.cisco.com/en/US/partner/docs/ios/ipv6/configuration/guide/ip6-addrg_bsc_con.html

“For other interface types (for example, serial, loopback, ATM, Frame Relay, and tunnel interface types—except tunnel interfaces used with IPv6 overlay tunnels), the interface ID is constructed in the same way as the interface ID for IEEE 802 interface types; however, the first MAC address from the pool of MAC addresses in the router is used to construct the identifier (because the interface does not have a MAC address).”

HTH

Laurent.

New Member

Link-local address on serial interface

Thanks Laurent,

but i already read the suggest link and it was not so clear about "pool of MAC addressess in the router" for this reason i created this discussion.

However i'll start to gather more info using cisco material.

Thanks for your time.

Cisco Employee

Link-local address on serial interface

The MAC address pool of the interface is assigned by various algroithms, based on the platform.  You should be able to see the MAC address of each interface with the "show interface" command.

New Member

Link-local address on serial interface

Hi Fabio.

I've got the same doubt.

Looking for this, I found a great explanation about that.

Take a look: http://ieoc.com/forums/t/22006.aspx

See you around

2415
Views
5
Helpful
4
Replies