Cisco Catalyst 4500 Series - Configuring BFD Echo Mode

37-14
Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
OL-25340-01
Chapter 37 Configuring Bidirection Forwarding Detection
How to Configure Bidirectional Forwarding Detection
Configuring BFD Echo Mode
BFD echo mode is enabled by default, but you can disable it such that it can run independently in each
direction.
BFD echo mode works with asynchronous BFD. Echo packets are sent by the forwarding engine and
forwarded back along the same path in order to perform detection—the BFD session at the other end
does not participate in the actual forwarding of the echo packets. The echo function and the forwarding
engine are responsible for the detection process; therefore, the number of BFD control packets that are
sent out between two BFD neighbors is reduced. In addition, because the forwarding engine is testing
Step 6
bfd interval milliseconds min_rx milliseconds
multiplier interval-multiplier
Switch(config-if)# bfd interval 500 min_rx 500
multiplier 5
Enables BFD on the interface.
Step 7
exit
Switch(config-if)# exit
Exits interface configuration mode and returns to global
configuration mode.
Step 8
ip route static bfd interface-type
interface-number ip-address [group group-name
[passive]]
Switch(config)# ip route static bfd
Gi6/1 10.1.1.1 group group1 passive
Specifies a static route BFD neighbor.
• The interface-type, interface-number, and ip-address
arguments are required because BFD support exists
only for directly connected neighbors.
Step 9
ip route [vrf vrf-name] prefix mask {ip-address
| interface-type interface-number [ip-address]}
[dhcp] [distance] [name next-hop-name]
[permanent | track number] [tag tag]
Example:
Switch(config)# ip route 10.0.0.0 255.0.0.0
Gi6/1 10.201.201.2
Specifies a static route BFD neighbor.
Step 10
exit
Example:
Switch(config)# exit
Exits global configuration mode and returns to privileged
EXEC mode.
Step 11
show ip static route
Example:
Switch# show ip static route
(Optional) Displays static route database information.
Step 12
show ip static route bfd
Example:
Switch# show ip static route bfd
(Optional) Displays information about the static BFD
configuration from the configured BFD groups and
nongroup entries.
Step 13
exit
Example:
Switch# exit
Exits privileged EXEC mode and returns to user EXEC
mode.
Command or Action Purpose