Bfd Support For Bgp; Centralized Bfd; Figure 9: Bfd For Ies/Vprn Over Spoke Sdp - Alcatel 7710 SR OS Configuration Manual

BFD Support for BGP

This feature enhancement allows BGP peers to be associated with the BFD session. If the BFD
session failed, then BGP peering will also be torn down.

Centralized BFD

The following applications of centralized BFD require BFD to run on the SF/CPM. Note that
centralized BFD sessions for the 7710 SR platform are limited to 25 sessions and minimum BFD
timer supported is 300 msec.
IES Over Spoke SDP
One application for a central BFD implementation is so BFD can be supported over spoke SDPs
used to inter-connection IES or VPRN interfaces. When there are spoke SDPs for inter-
connections over an MPLS network between two routers, BFD is used to speed up failure
detections between nodes so re-convergence of unicast and multicast routing information can
begin as quickly as possible.
The MPLS LSP associated with the spoke SDP can enter or egress from multiple interfaces on the
box. BFD for these types of interfaces can not exist on the IOM itself.
Note:
In this case BFD is run between
the IES/VPRN interfaces
7710 SR OS Router Configuration Guide
Metro
POP 1
IES/
VPRN
Spoke
SDP
Headend
Router
Headend
Router
IES/
VPRN
Metro

Figure 9: BFD for IES/VPRN over Spoke SDP

IP Router Configuration
BFD
Primary Path
Secondary Path
Metro
POP 2
IES/
VPRN
Spoke
SDP
IES/
VPRN
Metro
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