How do I distribute a default route?

Unanswered Question
Oct 16th, 2008
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Running EIGRP.


See attachment.

I need to make the default route, from all routers, get to my firewall. If something fails in the ring I want it to fail over and still be able to reach the firewall.


Scenario: Using static default routes, router 4 has a primary of C and a secondary of D.

Router 5 has primary of E and secondary of D.


Router 6 fails.


Router 5 uses secondary route of D but router 4 still has primary of D. Traffic just bounces back and forth.


Is there another way to do default routes without using static?



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Giuseppe Larosa Thu, 10/16/2008 - 13:15
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Hello Paul,

EIGRP supports a specific command that is ip default network: actually an EIGRP route is flagged as capable to support a default route and propagated in the EIGRP domain.

In your case the link is the R1 -FW link


requirements:

ip subnet on R1-FW must be in a different major network not subnetted

a network command for this subnet must be present in R1 router eigrp config


see

http://www.cisco.com/en/US/docs/ios/iproute/configuration/guide/irp_ip_prot_indep_ps6350_TSD_Products_Configuration_Guide_Chapter.html#wp1056287


note: you still need a default static route on R1 pointing to FW


Hope to help

Giuseppe



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