Weighted Load-Balancing over MPLS LSP
54 Router Configuration Guide
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.
• IES Over Spoke SDP
• BFD Over LAG and VSM Interfaces
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 IOMXCM itself.
Figure 11: BFD for IES/VPRN over Spoke SDP
Fig_31
Metro
POP 1
Metro
POP 2
Metro
POP 4
Metro
POP 3
Primary Path
BFD
Secondary Path
Note:
In this case BFD is run between
the IES/VPRN interfaces
independent of the SPD/LSP paths
Spoke
SDP
Spoke
SDP
Headend
Router
Headend
Router
IES/
VPRN
IES/
VPRN
IES/
VPRN
IES/
VPRN
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