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using a hsrp address with ospf?

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using a hsrp address with ospf?

Postby Guest » Tue Jan 11, 2011 3:36 pm

folks

 

i have 2 external routers as a hsrp pair running bgp on the outside & getting a default route from my isp

 

the internal networks are advertised to my bgp peer

 

on the inside i have a firewall cluster with static routes pointing to the external routers internal hsrp address

 

i now want to advertise the bgp default route into ospf to the firewall cluster & then into my internal networks

 

ive successfully configured both external routers and the internal firewall now has 2 default routes with equal costs from both routers but im wondering .........

 

- should i put a metric on one route & only have one default route in the routing table and the other held in the ospf database

 

or

 

- can i distribute the default route from my external routers using the hsrp address of the internal interfaces or is it unnecessary

 

if im right it shouldn matter and i may even be able to get rid of the hsrp configuration on the external routers internal interfaces since the bgp route advertised from the ISP router will determine where traffic is routed

 

apologies for the rambling post & thanks to anyone taking the time to read this or reply

Guest
 

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Re:using a hsrp address with ospf?

Postby Guest » Tue Jan 11, 2011 3:45 pm

mulhollandm wrote:

 

folks

 

i have 2 external routers as a hsrp pair running bgp on the outside & getting a default route from my isp

 

the internal networks are advertised to my bgp peer

 

on the inside i have a firewall cluster with static routes pointing to the external routers internal hsrp address

 

i now want to advertise the bgp default route into ospf to the firewall cluster & then into my internal networks

 

ive successfully configured both external routers and the internal firewall now has 2 default routes with equal costs from both routers but im wondering .........

 

- should i put a metric on one route & only have one default route in the routing table and the other held in the ospf database

 

or

 

- can i distribute the default route from my external routers using the hsrp address of the internal interfaces or is it unnecessary

 

if im right it shouldn matter and i may even be able to get rid of the hsrp configuration on the external routers internal interfaces since the bgp route advertised from the ISP router will determine where traffic is routed

 

apologies for the rambling post & thanks to anyone taking the time to read this or reply

 

If the external routers are using the same ISP then you are correct, you do not need HSRP anymore and you should just let OSPF propogate the 2 default routes to the firewall cluster. HSRP provides redundancy for end devices that do not participate in dynamic routing protocols but as the routers and the firewalls are using dynamic routing there is no need for HSRP in this scenario.

 

Jon

Guest
 

Re:using a hsrp address with ospf?

Postby Guest » Tue Jan 11, 2011 4:04 pm

jon

 

many thanks for your reply

 

greatly appreciated

 

id already removed the hsrp config as a test & things are working but i wasn sure if it was the right thing to do

 

thanks again

Guest
 



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