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Webcast-Catalyst9k
New Member

Load Balancing two Point to Point T1's

Hi, thanks for stopping by.

I'm having some difficulty load balancing two point to point T1's. This is a pretty basic transparent bridge as far as I understand it. I've followed the instructions in example 9 under doc id: 10676 to no avail. The moment I add both t1's to the circuit group I start getting problems reaching hosts on the other side of the bridge. I'll be able to ping them and then two minutes later I can't ping them at all. Then maybe a bit later I can see them again. On one side of the T1's is a 1720 and on the other is a 1721. Both are running 12.3(23). They both get updated with the circuit-group config at the same time. I think I've ruled out the T1's themselves by running the bridge on each T1 separately for some time (at least a week) without problems. But the moment I put them into a circuit group I start getting problems.

This sounds somewhat like a bridge loop maybe? Any tips on verifying this?

Here is the config from the 1720. The 1721 on the other side is basically the same config.

version 12.3

service timestamps debug uptime

service timestamps log uptime

no service password-encryption

!

hostname Router_Corp

!

boot-start-marker

boot-end-marker

!

!

memory-size iomem 25

no aaa new-model

ip subnet-zero

no ip routing

!

!

!

no ip cef

!

!

!

!

!

interface FastEthernet0

ip address x.x.x.x 255.255.255.0

no ip route-cache

speed auto

bridge-group 1

!

interface Serial0

ip unnumbered FastEthernet0

no ip route-cache

bridge-group 1

bridge-group 1 circuit-group 2

!

interface Serial1

ip unnumbered FastEthernet0

no ip route-cache

bridge-group 1

bridge-group 1 circuit-group 2

!

ip classless

no ip http server

!

bridge 1 protocol ieee

!

line con 0

line aux 0

line vty 0 4

!

end

Thank you very much!

Bob

2 REPLIES
Silver

Re: Load Balancing two Point to Point T1's

New Member

Re: Load Balancing two Point to Point T1's

I would take fastethernet out of the bridge group and create a bvi interface.

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