IP Router Configuration
Router Configuration Guide 55
BFD Over LAG and VSM Interfaces
A second application for a central BFD implementation is so BFD can be supported over
LAG or VSM interface. This is useful where BFD is not used for link failure detection but
instead for node failure detection. In this application, the BFD session can run between the IP
interfaces associated with the LAG or VSM interface, but there is only one session between
the two nodes. There is no requirement for the message flow to across a certain link, or VSM,
to get to the remote node.
Figure 12: BFD Over LAG and VSM Interfaces
Aggregate Next Hop
This feature adds the ability to configure an indirect next-hop for aggregate routes. The
indirect next-hop specifies where packets will be forwarded if they match the aggregate route
but not a more-specific route in the IP forwarding table.
Fig_32
Note:
In this case BFD is run between the
IES/VPRN interfaces independent
of the LAG or its members
BFD
BFD BFD
L2 Switch
IES/
VPRN
LAG i/f LAG i/f
LAG i/f
IES/
VPRN
IES/
VPRN
2
2
4
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