I have two T1/s pointing to the HQ of the company and one redundant VPN failover with OSPF over Internet. Normally when both T1/s go down the OSPF recalculates the routing table and installs all routes learned over the VPN failover. I need to configure the network in a way when one of the T1/s goes down the entire connectivity to be placed over the failover VPN. Now if one of the lines goes down the traffic is still passed over the second T1 and the bandwidth is not enough. How can I get this working? Is the PPP Multilink a good solution in this case? I mean to combine the 2 T1/s in a Multilink.
Any help will be highly appreciated. Thank in advance!
I addition to Rick's post, while configuring PPP multilink, use the command " multilink min-links links mandatory " and specify the minimum link as 2. In that case even if 1 T1 gows down the entire Multilink bundle with get disabled and it will fall back on VPN link.