I have a basic query on difference between serial & ethernet. Iam aware of how they work and bits will be transmitted over the interface. But in practical.. now a days most clients prefer to go with the Ethernet handoff from ISP (like cablevision) than using an additional router on external zone with Serial interfaces.
For ex: if I have one link with Ethernet hand-off and another link with Serial i/f for ISPs, then even Ethernet hand off ISP has infrastructural issues, that will not make the ethernet i/f on my end 'down' and will not cause automatic failover to happen(hope my statement makes some sense).
Also, lets say,in an OSPF environment, if I have a Ethernet hand off to ASA from ISP, and incase the IPS having issues, only because of the reason the next hop of ASA is reachable (route outside 0.0.0.0 0.0.0.0 x.x.x.x 1) and connected via ethernet i/f, the backup route will not be used/installed in the LAN core routing table.
So my basic question is... Serial interface are more sensitive in detecting loss of signal than Ethernet..?
I do have some idea, but wanted to hear from Gurus in the Forum.
Thank you in advance for your time...