From: Alexei Monastyrnyi (alexeim@orcsoftware.com)
Date: Wed Jan 16 2008 - 14:27:16 ARST
Hi.
If I got you right, you would like to have all virtual forwarders on
router 3 to be in listening state as long as routers 1 and 2 can forward
traffic. To my knowledge it can be achieved in theory with help of GLBP
weighting settings and enhanced object tracking.
In interface configuration mode there is a GLBP config parameter like this:
R3(config-if)#glbp 204 weighting 105 ?
lower Weighting lower threshold
upper Weighting upper threshold
<cr>
One can set lower threshold to some value and then track something from
routers 1 and 2 which would turn weighting low if those routers are
capable of forwarding traffic.
glbp 204 weighting track 10 decrement 30
This sounds a little bit "creative" :-), the task is to configure a
logic with object tracking like this: "if router 1 and router 2 have
outgoing interfaces available for ping - router 3 decrements its glbp
weighting and therefore pulls itself out of GLBP forwarding state. If
both outgoing interfaces on router 1 and router 2 are down, router 3
stops decrementing and is back to be an active forwarder." Something
alone those lines. I don't work with object tracking very often, so
nothing have come up to my mind during the day...
HTH,
A.
Terry Tender said the following on 1/15/2008 11:44 AM:
> Hi all
>
> Is it possible to have 3 routers configured for GLBP and the load balancing
> is only 2 routers (Active/Active) and the 3rd router is in standby mode
> (Passive)? Becuase the 3rd link is not very desirable unless the first 2
> rotuer links fail...
>
> Regards.
>
> Terry
>
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