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Load balanced T3s

colin.higgins
Level 1
Level 1

I have a 3640 with 2 hssi interfaces, connected to 2 DS3 circuits. I am load-balancing the traffic simply through 2 default static routes -ex:

ip route 0.0.0.0 0.0.0.0 <isp's router>

ip route 0.0.0.0 0.0.0.0 <isp's router>

I also have the statement "down when looped" on both interfaces. The router is not running and routing protocols. However, when one circuit fails, the router continues to load balance the traffic into the bad link, thus packets get dropped. Is there a way around this?

6 Replies 6

james.feger
Level 1
Level 1

ip route 0.0.0.0 0.0.0.0

ip route 0.0.0.0 0.0.0.0

If you use the interface as the gateway, the route will go away if the interface goes down.

Ugh

It should read:

ip route 0.0.0.0 0.0.0.0 interface1

ip route 0.0.0.0 0.0.0.0 interface2

Where interface is the actual interface of the connection.

colin.higgins
Level 1
Level 1

I changed it to read

ip route 0.0.0.0 0.0.0.0 hss1/0

ip route 0.0.0.0 0.0.0.0 hss2/0

but if one link fails, I STILL get lost packets. The router is still trying to send data over the failed link. What's up with this?

Make sure that default route over the failed link disappear when the line fails. if it disappears, ask your provider to confirm their route of two links.

Back your config to use the next-hop-ipaddress, that is better always if you know exactly what it is.

whatis the value of the parameter: keepalive?

keepalive is set to 10