BFD notifies RSVP-TE if the BFD session goes down, in addition to notifying other configured BFD enabled protocols (for example, OSPF, IS-IS, and PIM). This notification is then used by RSVP-TE to begin the reconvergence process. This greatly accelerates the overall RSVP-TE response to network failures.
All encapsulation types supporting IPv4 and IPv6 are supported because all BFD packets are carried in IPv4 and IPv6 packets; this includes Frame Relay and ATM.
BFD is supported on the following interfaces:
Ethernet (Null, Dot1Q, and QinQ)
Spoke SDPs
LAG interfaces
The following interfaces are supported only on the 7750 SR and 7450 ESS:
VSM interfaces
POS interfaces (including APS)
Channelized interfaces (PPP, HDLC, FR, and ATM) on ASAP (priority 1) and channelized MDAs (priority 2) including link bundles and IMA