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Balance traffic by source with policy routing

Hello, dear colleagues!

At moment i'm decide challenge - balance traffic to some PC-routers (NAT,traffic shape) from BRAS (cisco routers)

(See attachment)

Clients connecting by pppoe to cisco bras (bras-1,bras-2), but some clients traffic (unlimited users) must redirect to PC-routers (sr-1,sr-2,sr-3)...

now i have NO ready normal solution to resolve this task

1. static policy (route-map)

src=UNLIMM => next-hop => SR-x

2. static policcy (route-map) +sla (check)

src=UNLIM => next-hop => SR-1 SR-2 SR-3 (set ip next-hop verify-availability)

if (SR-1 down => next-hop SR-2 etc)

3. (balance traffic ?)

ip of next-hop in route map set any IP (for examble a.a.a.a)

and add static route

ip route a.a.a.a/32 -> SR-1

ip route a.a.a.a/32 -> SR-2

ip route a.a.a.a/32 -> SR-3

What do you think as optimal this solution (balancing,resiliency)?