[c-nsp] GLBP vs. HSRP vs. VRRP

[Asbjorn Hojmark - Lists]

> IIRC, GLBP used different MAC addresses for the virtual MAC on
> a group-by-group basis; It seemed like it would cause a
> headache during troubleshooting.  Please correct me if I am
> misunderstanding something.

It's true that the AVG and the AVFs have virtual MAC addresses,
which depend on the GLBP group number, but the group number can
be the same on multiple interface.

UD11#sh glbp brie
Interface   Grp  Fwd Pri State    Address         Active router   Standby
route
Vl2001      1    -   200 Active   10.65.1.1       local           10.65.1.3

Vl2001      1    1   7   Active   0007.b400.0101  local           -
Vl2001      1    2   7   Listen   0007.b400.0102  10.65.1.3       -
Vl2002      1    -   100 Standby  10.65.2.1       10.65.2.3       local

Vl2002      1    1   7   Active   0007.b400.0101  local           -
Vl2002      1    2   7   Listen   0007.b400.0102  10.65.2.3       -
Vl2003      1    -   200 Active   10.65.3.1       local           10.65.3.3

Vl2003      1    1   7   Active   0007.b400.0101  local           -
Vl2003      1    2   7   Listen   0007.b400.0102  10.65.3.3       -
Vl2004      1    -   100 Standby  10.65.4.1       10.65.4.3       local

Vl2004      1    1   7   Active   0007.b400.0101  local           -
<snip>

HSRP also uses a virtual MAC dependant on the standby group, but
has no concept of an AVF, of cause.

-A