MLPPP Across 3 Bundles - Load Balancing

Unanswered Question

I have a 2811 Internet Router running c2800nm-advsecurityk9-mz.124-11.T1.bin IOS. This router has 6 individual T-1 connections and I would bundle these T-1's in 3 groups of two T-1's giving me three 3 MB connections.

One of my questions is what is the best way to bundle these connections and rate limit my end users plus add have some redundancy with my internet connections.


With my limited knowledge of MLPPP, I know I can configure them with this and that the carrier must do the same on their side. I have written the configuration below, please review for correctness and add anything I may have missed. Here are my questions regarding MLPPP with 3 Bundles.


Once the carrier and I have configured the 3 MLPPP connections, how will we be able to load balance across these bundles? How will I configure the routing? Today the router is configured with CEF enabled on the 6 T-1?s with 6 default routes. Should MLPPP be configured the same way once we have the 3 MLPPP connections in place? How should the carrier configure their side to load balance the incoming traffic? How do we handle the static routing for our class ?C? ip address space?


If we do configure 3 default routes on our side and the carrier?s side, what happens when one of the next hop ip addresses of the default route is not available on either side? What happens?


Thanks!





interface Multilink1

ip address X.X.X.X 255.255.255.252

no cdp enable

encapsulation ppp

no ip route-cache

no ip mroute-cache

no ip route-cache cef

no ppp multilink fragmentation

no fair-queue

ppp multilink group 1

ppp multilink

!

interface Multilink2

ip address X.X.X.X 255.255.255.252

no cdp enable

encapsulation ppp

no ip route-cache

no ip mroute-cache

no ip route-cache cef

no ppp multilink fragmentation

no fair-queue

ppp multilink group 2

ppp multilink

!

interface Multilink3

ip address X.X.X.X 255.255.255.252

no cdp enable

encapsulation ppp

no ip route-cache

no ip mroute-cache

no ip route-cache cef

no ppp multilink fragmentation

no fair-queue

ppp multilink group 3

ppp multilink

!

interface Serial0/0/0:0

no ip address

no cdp enable

encapsulation ppp

no ip route-cache

no ip mroute-cache

no ip route-cache cef

no fair-queue

ppp multilink group 1

ppp multilink

!

interface Serial0/0/1:0

no ip address

no cdp enable

encapsulation ppp

no ip route-cache

no ip mroute-cache

no ip route-cache cef

no fair-queue

ppp multilink group 1

ppp multilink

!

interface Serial0/1/0:0

no ip address

no cdp enable

encapsulation ppp

no ip route-cache

no ip mroute-cache

no ip route-cache cef

no fair-queue

ppp multilink group 2

ppp multilink

!

interface Serial0/1/1:0

no ip address

no cdp enable

encapsulation ppp

no ip route-cache

no ip mroute-cache

no ip route-cache cef

no fair-queue

ppp multilink group 2

ppp multilink

!

interface Serial0/2/0:0

no ip address

no cdp enable

encapsulation ppp

no ip route-cache

no ip mroute-cache

no ip route-cache cef

no fair-queue

ppp multilink group 3

ppp multilink

interface Serial0/2/1:0

no ip address

no cdp enable

encapsulation ppp

no ip route-cache

no ip mroute-cache

no ip route-cache cef

no fair-queue

ppp multilink group 3

ppp multilink

end



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paolo bevilacqua Thu, 10/11/2007 - 17:56
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Sure you can do this. Please enable ip route cache cef for both physical and multilink interfaces. Then you will have 3 static routes instead of 6. The ISP will route traffic toward you based on their topology.

On non-availability of a link or a bundle, the surviving ones will route all traffic.


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