I am trying to build a redundant hub-and-spoke frame topology to remote-site C from 2 hubs at A & B using point-to-point sub-interfaces as shown below.
I am using static routes and want to configure a floating static route for backup. However, if the local link at A were to go down, would the floating route to hub B be used at C since the line protocol for the primary link would still be up although the PVC might be inactive?
You are right! The floating static route will not kick in if the line protocol is up. In this scenario I would recommend you to use a routing protocol instead of static routes which will help you to overcome this limitation.
LMI will include the status of all PVCs terminated at your DTE. But you are assuming the only possible cause of an outage is that a link or piece of hardware has gone down. Unfortunately, it is not unheard of in FR networks, that during network grooming at night, your PVC can become misconfigured. The only true way to have 100% guarantee of having you routing insync with your true end to end connectivity is to use a dynamic routing protocol.
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