I have a site with three WAN connections and three routers. The first two are T-3’s and should be load balanced while they are in use. The third is a slow 3g connection that is only used to provide some basic data connectivity. I am implementing GLBP for the all three routers but how should I incorporate the third router in the GLBP group? The way I understand GLBP is that all three will become an AFV and send traffic which is not the desired result. I want the two primary connections to be load balanced; if one of the primary connections were to fail I still want all the traffic to go over the remaining T3. The only time traffic should go over the third link is when both routers have failed. If have the load sharing and redundancy working for the two primary routers but don’t know how to configure the third. Is this possible with GLBP?
- priority: it is used to elect the AVG that is the device that answers ARP requests for the VIP address
- weighting: it is used to decide if an AVF should be used or not. This parameter can be influenced by tracking options and has a lower threshold (under which the router will resign its AVF role) and an upper threshold (over which AVF role is reenabled)
Taking in account this you can configure first two routers in the following way:
if the WAN interface fails the weighting decrement is so big to go under the lower threshold and the router stops to be an AVF for the GLBP group.
I understand the workaround you have proposed and how to implement it but unfortunately it will still not work for a correct solution. Even using the third link 1% of the time is 1% too much for our desired outcome. Any other suggestions? Can I use VRRP and GLBP at the same time?
You could use weight by increasing teh weight on first and second router and low weight on the third router. How hosts are assigned to each GLBP router can be altered by using on of 4 load balancing options such as weight. placing a weight will calculate the amount of load sharing that will occur through the MAC assignment.
Thanks. I understand the weighting and how it works unfortunately I don’t think it will meet my criteria. I don’t want ANY traffic to go over router 3 unless router 1 and 2 has failed or they can not use their serial link. I can accomplish load sharing and weighting to make this happen but I still can not get the third router to only load share traffic if the other AVF’s are not active.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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