GLBP

Unanswered Question

HI EXPERTS!

If we 2 routers runing GLBP for wan redundancy.this is the config for the 1st active router:

ACTIVE-ROUTER 1

***************

interface fastethernet 0/0

ip address 10.10.100.2 255.255.255.0

glbp 10 ip 10.10.100.1

glbp 10 forwarder preempt delay minimum 60

glbp 10 load-balancing host-dependent

glbp 10 preempt delay minimum 60

glbp 10 priority 254

glbp 10 timers 5 18

glbp 10 timers redirect 600 7200

glbp 10 weighting 110 lower 95 upper 105

glbp 10 weighting track 2 decrement 5

!

track 2 interface f0/1 ip routing

waht could be the config for the Standby router(ROUTER 2) based on the first input?

STANDBY-ROUTER 2

??????????????

I have this problem too.
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Jon Marshall Wed, 02/21/2007 - 03:47

Hi Ali

First i think you need to make a change to your active router config.

i think you probably want to change

track 2 interface f0/1 ip routing to

track 2 interface f0/1 line-protocol

You also need to adjust your weightings. If f0/1 goes down it will not switch because you are only taking 5 off the weighting and this does not take it below 95.

So change

glbp 10 weighting track 2 decrement 5 to

glbp 10 weighting track 2 decrement 20

110 - 20 = 90 which is less than your lower threshold of 95.

For the other router

interface fastethernet 0/0

ip address 10.10.100.3 255.255.255.0

glbp 10 ip 10.10.100.1

glbp 10 load-balancing host-dependent

glbp 10 priority 100

glbp 10 timers 5 18

glbp 10 timers redirect 600 7200

glbp 10 weighting 110 lower 95 upper 105

glbp 10 weighting track 2 decrement 20

!

track 2 interface f0/1 line-protocol

I hope this works -please let me know if you have any problems.

Jon

HI JON!

SO THE FINAL CONFIG AFTER UR CHANGE COULD BE LIKE THIS:

ACTIVE-ROUTER 1{AVG}

********************

interface fastethernet 0/0 ip address 10.10.100.2 255.255.255.0

glbp 10 ip 10.10.100.1

glbp 10 forwarder preempt delay minimum 60

glbp 10 load-balancing host-dependent

glbp 10 preempt delay minimum 60

glbp 10 priority 254

glbp 10 timers 5 18

glbp 10 timers redirect 600 7200

glbp 10 weighting 110 lower 95 upper 105

glbp 10 weighting track 2 decrement 20

!

track 2 interface f0/1 line-protocol

!

STANDBY-ROUTER 2{AVF}

*********************

interface fastethernet 0/0

ip address 10.10.100.3 255.255.255.0

glbp 10 ip 10.10.100.1

glbp 10 load-balancing host-dependent

glbp 10 priority 100

glbp 10 timers 5 18

glbp 10 timers redirect 600 7200

glbp 10 weighting 110 lower 95 upper 105

glbp 10 weighting track 2 decrement 20

!

track 2 interface f0/1 line-protocol

!

ANY COMMENTS?

10XS

Jon Marshall Wed, 02/21/2007 - 04:36

Hi Ali

You would need a default route on R1 & R2 pointing to the releavant ISP wireless address but your clients will be fine.

Jon

Jon Marshall Wed, 02/21/2007 - 06:03

Hi Ali

If the links are P2P links then you can use either interfaces or ip addresses as next hop. if not then use IP addresses.

As for Glbp config - looks fine to me. You might want to add a "glb 10 preempt ..." command on R2 but it won't make any difference really as it has a lower priority anyway.

Let me know how it goes

Jon

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