We setup a link on remote site to connect to Head office . Now,it require fault tolerant. If I have another router on remote site, can it share the one link at the same time?
This is not possible. Instead you can use ppp multilink to bundle different serial links and also provide load balance and fault tolerance to one remote site. Here's a link on PPP multilink:
If this is Metro-Ethernet you can do Ether-Channel.
Cisco on-board Eth ports do not support ether-channel however their NM modules and switches do.
Check with your Service Provider if they support Ether-Channel.
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