You have have 2 default routes pointing to t exit interfaces like
ip route 0.0.0.0 0.0.0.0 s0
ip route 0.0.0.0 0.0.0.0 s1
or if you want to split traffic via traffic type then you can implement policy base routing on lan interface so as soon as the traffic hits the lan interface will check the traffic type (using access list) and will send to that particular serial interface as exit interface configurd in policy.
But if you just want any traffic to go via any serial link then 2 default route will work.
in addition to the previous post by Ankur, and depending on the IOS version you are running, you also might want to have a look at Multilink PPP over Frame Relay and Multilink Frame Relay (FRF.16.1), here are the relevant links:
With the remote sites you mean not the HQ right? My solution was for a site where 2 t1 terminates on same router but as you said there were 2 different offices so it will be 2 diff routers now are you merging 2 t1 on single router on remote site then yes you have to c hnage the config and configure second t1 on same router also and put 2 defaut routes to reach HQ via 2 t1 links equally.
We are pleased to announce availability of Beta software for 16.6.3.
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