Configuring BFD BFD Overview
OmniSwitch AOS Release 7 Network Configuration Guide June 2013 page 20-7
To create a BFD session for a static route, make sure that:
• the gateway address does not match any of the local interface addresses on the switch
• BFD is enabled on the interface on which the gateway address exists.
• if multiple routes are configured with the same gateway address, only one BFD session is run.
Note. To display the static routes on which BFD is enabled use the show ip router database command
along with the protocol static option as shown below:
Example:
r4c1-> ip static-route 100.0.0.0/8 gateway 100.1.1.10 bfd-state enable
r4c1-> show ip router database protocol static
Legend: + indicates routes in-use
b indicates BFD-enabled static route
r indicates recursive static route, with following address in brackets
Total IPRM IPv4 routes: 7
Destination Gateway Interface Protocol Metric Tag Misc-Info
-------------------+---------------+------------+--------+-------+-----+-----------
+b 100.0.0.0/8 100.1.1.10 v1001 STATIC 1 0
+ 128.251.40.0/24 172.28.4.254 EMP STATIC 1 0
Inactive Static Routes
Destination Gateway Metric
--------------------+-----------------+---------
See the “IP Commands” chapter in the OmniSwitch CLI Reference Guide for information about the fields
in this display.
BFD Overview
Detecting communication failures as soon as possible is the first step in any network recovery process;
until a failure is detected, network convergence can’t begin. By rapidly detecting failures, BFD enables
faster convergence of routing protocols particularly on shared media such as ethernet.
The BFD protocol is very similar to the widely-used Hello mechanisms prevalent in a majority of routing
protocols, with the exception that BFD tests bidirectional communication links, has smaller packets, and is
focused exclusively on path-failure detection. BFD can also be less CPU-intensive in routers with distrib-
uted architecture because unlike routing protocol Hello packets, BFD packets can be processed on the
interface modules rather than the control plane.
BFD protocol is a fairly simple Hello protocol designed to provide fast forwarding path failure detection
that can be enabled at the interface and routing protocol levels. It helps in the verification of forwarding
plane-to-forwarding plane connectivity (including links, interfaces, tunnels). It allows semantic separation
of forwarding plane connectivity and control plane connectivity. BFD is a single mechanism that works
independently of underlying media, data, and network protocols. It can be associated with any routing
protocol running between two systems. Moreover, it requires no changes to the existing protocols.
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