10-10-2007 06:12 AM - last edited on 03-25-2019 03:16 PM by ciscomoderator
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
10-11-2007 05:56 PM
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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