[afnog] Multiple Gateways on a Server

[Mark Tinka]

On Monday 24 September 2007 23:14, Bruce Zamaere wrote:

> Hope the ascii drawing looks alright.

The ASCII was a bit broken (on my mailer, anyway). It's no 
big deal... :-).

> Simply put. I have 
> a server farm that is on a lan with two routers. I want
> to be able to configure the servers to use both routers.
> Load balancing or load sharing isn't really a concern
> here. Is it possible to have two default gateways for
> these servers? Servers are running Linux... routers are
> all Cisco.

Sounds like a job for GLBP (Gateway Load Balancing 
Protocol).

Like HSRP and VRRP, GLBP provides first-hop router 
redundancy to downstream hosts, but also provides for load 
balancing.

Consider the following URL for additional information 
(including configuration examples):

http://tinyurl.com/ynvy6x

HSRP does support load balancing as well, via M-HSRP 
(Multiple HSRP) groups. VRRP load balancing support 
utilizes a similar architecture. However, both these 
protocols suffer from the same problem when you need them 
to support load balancing; half your hosts need to be 
configured for one virtual default gateway, while the other 
half are configured for the second virtual gateway. This is 
burdensome and adds complexity.

GLBP (as is HSRP) is Cisco proprietary, as far as I recall. 
However, as yours is an all-Cisco network, this should not 
be a problem.

Cheers,

Mark.
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