From: Russell Kelly \(rukelly\) (rukelly@cisco.com)
Date: Sat Jul 15 2006 - 18:57:58 ART
Yes -- it's primarily for more 'evenly distributed' load balancing by
sharing a single virtual IP and sharing load balancing on MAC. It does
actually give an even load distribution in the real world (believe it or
not :-)) ---- troubleshooting aside --- though HSRP was considered
'complicated' in the old days --- however no-days with L3 design to the
access layer in campus LANs these days it does fit --- obviously not in
server farms with content switching NIC redundancy et al --- but hey
that's not for the CCIE discussion :-)
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
James Ventre
Sent: 15 July 2006 22:45
To: spycharlies@hotmail.com
Cc: ccielab@groupstudy.com
Subject: Re: GLBP Load Balancing ?
You would want to use it if you needed to utilize the bandwidth on more
than one of the links leaving your local segment.
There are plenty of reasons NOT to use it. One of them is that it
removes the deterministic nature of HSRP and complicates troubleshooting
.... like when a server admin can't ping their default gateway. With
HSRP, I know which router they are trying to reach, and can skip a bunch
of troubleshooting steps. With GLBP I have to start figuring out what
MAC he was given for his GW ... then start the process. KISS goes a
long way in networking.
James
spycharlies@hotmail.com wrote:
> Am trying to understand a scenerio in which GLBP was prefered over
HSRP.
>
> ...from cisco documentation
> ----------------------------
> "GLBP differs from Cisco Hot Standby Redundancy Protocol (HSRP) and
IETF RFC 3768 Virtual Router Redundancy Protocol (VRRP) in that it has
the ability to load balance over multiple gateways. Like HSRP and VRRP
an election occurs, but rather than a single active router winning the
election GLBP elects an Active Virtual Gateway (AVG). The job of the AVG
is to assign virtual MAC addresses to each of the other GLBP routers and
to assign each network host to one of the GLBP routers."
>
> Does anyone have a better explanation, why i would use GLBP over
HSRP??
>
> cheers
> Uyota
>
>
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