IP routing with reduncacy

Answered Question
Aug 23rd, 2010

We have a requirement from our customer to have a fully redundant path to the outside internet.  The servers within our enclave will need to be able be routed to by an external enclave.  The switches with the network are setup as the primary and secondary default gateways for the internal network.  How can we advertise the sole network we have and have each piece of equipment within the chain paying attention to failures ahead so that the route back can be poisoned and traffic be diverted to the secondary path?  I don't have a issue if the solution brings in load sharing, unfortunately I can't solve a way for a windows computer to use a secondary default gateway if the first is still working.  Thanks for your help.

I have this problem too.
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Correct Answer by Nagaraja Thanthry about 6 years 3 months ago

Hello,

You could try HSRP on the inside interface of both routers. As long as both

inside interfaces are on the same subnet, the HSRP can make sure that the

default gateway IP is always held by an active device.

http://www.cisco.com/en/US/tech/tk648/tk362/technologies_configuration_e...

le09186a0080094e90.shtml

With regard to advertising the 200.x.x.x subnet is concerned, you can

configure conditional route advertisement (if using BGP).

http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example...

6a0080094309.shtml

Hope this helps.

Regards,

NT

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Correct Answer
Nagaraja Thanthry Mon, 08/23/2010 - 17:40

Hello,

You could try HSRP on the inside interface of both routers. As long as both

inside interfaces are on the same subnet, the HSRP can make sure that the

default gateway IP is always held by an active device.

http://www.cisco.com/en/US/tech/tk648/tk362/technologies_configuration_e...

le09186a0080094e90.shtml

With regard to advertising the 200.x.x.x subnet is concerned, you can

configure conditional route advertisement (if using BGP).

http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example...

6a0080094309.shtml

Hope this helps.

Regards,

NT

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