Re: MAC Address and Logical Router Interface

Discussion in 'Cisco' started by Stephen, Nov 7, 2008.

  1. Stephen

    Stephen Guest

    On Wed, 05 Nov 2008 22:59:35 GMT, Graham Drabble
    <> wrote:

    >Hi,
    >
    >Do all the logical interfaces on a physical Ether interface have the
    >same MAC address? If not how is the MAC address for eahc logical
    >interface defined?


    it depends :)

    the hardware can support different MAC addresses on the same interface
    (at least since the 25xx routers).

    this used to be common - DECnet forced the MAC address to include the
    L3 address, XNS forced all ports to the same MAC and so on.

    Different MACs are used with HSRP / VRRP by the current "owner" of a
    shared gateway address, for different groups and for the native
    address.

    i think if you have multiple IP addresses on a port, it will use the
    same MAC - but it is so long since i tried i dont remember.

    on cisco switches each vlan interfaces gets a separate MAC, so you
    will different MACs per IP interface in each VLAN on a trunked
    interface.
    >
    >Thanks,

    --
    Regards

    - replace xyz with ntl
    Stephen, Nov 7, 2008
    #1
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