[c-nsp] etherchannel load-balance when un-equal traffic

[Suchy Daniel]

Traffic between routers is on switch always identified by their src/dst 
MAC addresses (tunnels have no effect).

Some boxes can lookup in higher layers (IP addresses / ports) and 
balance traffic using these informations. But 3550 can balance by 
src/dst MAC _only_. If flow from one router will reach for example one 
gigabit, whole gigabit flow will be sent to one line in channel.

> Actually the traffic that flows between routers is traffic that has 
> source & destination the routers themselves (tunnels between them) so i 
> believe ip or mac load-balancing would be the same.
> 
> So we're talking about 5 different and unequal flows of traffic. And i 
> want to distribute these flows equally across the 2 GE links using a L2 
> method (so i don't have to use different L3 networks).
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