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Cisco, Cisco Router, Cisco 2650 and 2811, two t1s wondering whats best for optimization

Posted on 2007-08-09
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I have to t1s going to another router in our data center.  I know I can bond these t1s using PPP multilink, but is this the most optimal solution?

I had also looked at CEF and using ip load-sharing per-packet on each of the interfaces.  If i do that will it give the aggregated bandwidth of the two circuits?

What is the most optimal solution? Could someone explain to me how CEF works with the load-sharing per-packet?  in comparison to PPP multilink?

Thanks!
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Question by:trivalent
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Jim_Coyne earned 1000 total points
ID: 19664115
ppp multilink is the way to go.

Per-packet load-balancing means that the router sends one packet for destination1 over the first path, the second packet for (the same) destination1 over the second path, and so on. Per-packet load balancing guarantees equal load across all links. However, there is potential that the packets may arrive out of order at the destination because differential delay may exist within the network.

ppp multilink avoids the above problems
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by:Jim_Coyne
ID: 19664135
The PPP Multilink Protocol fragments, sequences, and re-orders alternating packets sent across multiple physical connections so that the end result is a single logical link with the combined bandwidth of all of the aggregated physical links.
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by:trivalent
ID: 19664559
thank you!
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by:trivalent
ID: 19664576
One more question... CEF is already enabled on both routers, if I am setting up ppp multi link would i disable cef?

perform a no ip cef?
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by:Jim_Coyne
ID: 19664655
no need to disable cef, just do the following

int s1/0
encap ppp
ppp multilink group 1
int s1/1
encap ppp
ppp multilink group 1

Add this if you are sending voice across the multilink:
int multilink 1
ppp multilink fragement-delay 10
ppp multilink interleave

add this if you want the interface to show as down in the event a single link fails:
ppp multilink links min 2 mandatory

add this if you want the link to show as down if the quality drops below 50%
ppp quality 50
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by:trivalent
ID: 19664688
thanks!
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