route-map to override default gateway
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Posted by on April 19, 2006, 7:22 pm
Please log in for more thread options I am in the process of switching backbone providers and for a time will have two ISPs connected to my cisco 3600. 1st on a t1 2nd on a atm pvc I have been operating on the 1st using static routes 0.0.0.0 pionting to the serial interface, now I want to config my servers on the lan with IPs provided by the 2nd ISP so each server will have two IPs, one from the 1st and one from the 2nd. So how do I get traffic on the 2nd ISP's IPs to only traverse the atm pipe? I though of doing a route-map as copied below, which looks to work for traceroute and ping, but any tcp/udp traffic stalls. It seems to send one packet and then get hung. Thank you for your advice! Christopher -- access-list 1300 remark Provides matching of CIT addresses for atm pipe access-list 1300 permit 63.247.209.0 0.0.0.255 access-list 1300 permit 63.247.210.0 0.0.1.255 access-list 1300 permit 63.247.212.0 0.0.0.255 route-map gotosprings permit 10 match ip address 1300 set ip next-hop 63.247.196.33 <- 2nd isp end of the atm pvc int f0/0 <- this int has a primary ip from the 1st isp and a secondary from the 2nd ip policy route-map gotosprings ip route-cache policy | |||||||||||||||||||
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Posted by Merv on April 19, 2006, 7:47 pm
Please log in for more thread options command as that is for fast-switching PBR which is slower than CEF PBR | |||||||||||||||||||
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Posted by on April 21, 2006, 7:03 pm
Please log in for more thread options Merv,
Thanks for the info... I turned of cef "no ip cef", but it did not make any difference. I also tried making default routing a policy only decision and removed all the default 0.0.0.0 routes like this: route-map findgateway permit 10 match ip address 1300 <- matches source ip's from 2nd isp set ip default next-hop b.b.b.b route-map findgateway permit 20 match ip address 1301 <- matches source ip's from 1st isp set ip default next-hop a.a.a.a 1st ISP worked, but 2nd did not. I even shutdown the 1st ISP interfaces just to make sure it wasn't through a kink into the works, but no go. Any other ideas? Could there be a ACL or policy upstream on the 2nd ISP causing problems? Thank you, Christopher | |||||||||||||||||||
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Posted by on April 25, 2006, 4:08 pm
Please log in for more thread options I fixed the problem.
Turned out to be an ATM cloud issue with the telco that was dropping packets over 500 bytes. Once that was fixed by the telco rebuilding the path, everything worked! A few notes on cpu utilization and route-map. When running CEF and route-map, make sure to issue no ip route-cache cef on the interface that is doing route-map and also add ip route-cache policy. Christopher | |||||||||||||||||||
