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Creating gre Tunnels on a glbp enabled router

Answered Question
Jul 19th, 2012
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Which is the best way of creating GRE Tunnels on a GLBP enabled router?

I actually have two 3845 with GLBP configured as our gateway routers, and need to create gre tunnels to branches.

The  plan is to use the GLBP virtual IP as the Tunnel Source address and the  branch WAN interface as the tunnel Destination address,

my issue  is how do i handle the Tunnel IP address? Do i create the same Tunnel  on both gateway routers and have a glbp virtual IP address

for the Tunnel Interface as well????

Correct Answer by Giuseppe Larosa about 5 years 1 month ago

Hello Tekena,

it is not clear if GLBP is running on internal interface towards local clients or on the "WAN" interface towards branch offices.


In any case for better redundancy you should build two GRE tunnels from each branch router one terminated on HQ_R1 and one terminated on HQ_R2.

For this reason I would not use/reference the GLBP VIP in the GRE tunnel configurations.


In any case the GRE tunnels should be defined on both HQ_R1 and HQ_R2.

If GLBP is serving internal clients, it is likely that traffic  may reach both HQ routers (when coming from different clients) so having indipendent GRE tunnels to each branch provides a better match with traffic patterns.


Hope to help

Giuseppe

Correct Answer by cadet alain about 5 years 1 month ago

Why not just use the wan physical interfaces of main and branch for the tunnel on each router in the glbp group  ?


Regards.


Alain.


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Correct Answer
cadet alain Thu, 07/19/2012 - 02:46
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Why not just use the wan physical interfaces of main and branch for the tunnel on each router in the glbp group  ?


Regards.


Alain.


Don't forget to rate helpful posts.

Correct Answer
Giuseppe Larosa Thu, 07/19/2012 - 02:47
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    Founding Member

Hello Tekena,

it is not clear if GLBP is running on internal interface towards local clients or on the "WAN" interface towards branch offices.


In any case for better redundancy you should build two GRE tunnels from each branch router one terminated on HQ_R1 and one terminated on HQ_R2.

For this reason I would not use/reference the GLBP VIP in the GRE tunnel configurations.


In any case the GRE tunnels should be defined on both HQ_R1 and HQ_R2.

If GLBP is serving internal clients, it is likely that traffic  may reach both HQ routers (when coming from different clients) so having indipendent GRE tunnels to each branch provides a better match with traffic patterns.


Hope to help

Giuseppe

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