NBMA loss of DR

[John Moy <[e-mail]>]

Stan-

You could make a case for making OSPF routers automatically detect NBMA
topologies that are not completely connected, and to then try to split
them into separate NBMAs accordingly. This is not as easy as you think
though -- you need a reliable means to detect whether a single PVC is
down, or whether the router's entire Frame relay interface is down.
(The latter seems much more likely, and is handled fine by OSPF). And
when you split up an NBMA, you probably also want to reassign some of
the IP addresses...

As I said in the last paragraph of the note you are replying to
(although it was on the OSPF list, so I guess the iplpdn people didn't
see it), if this is an operational issue you just need to configure
the failure-prone PVCs as their own IP subnets, ala the Internet Draft
draft-ietf-ospf-guidelines-frn-00.txt.

John