Configuring Bfd Echo Mode - Cisco Catalyst 4500 Series Configuration Manual

How to Configure Bidirectional Forwarding Detection
Command or Action
Step 6
bfd interval milliseconds min_rx milliseconds
multiplier interval-multiplier
Switch(config-if)# bfd interval 500 min_rx 500
multiplier 5
Step 7
exit
Switch(config-if)# exit
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
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
Step 10
exit
Example:
Switch(config)# exit
Step 11
show ip static route
Example:
Switch# show ip static route
Step 12
show ip static route bfd
Example:
Switch# show ip static route bfd
Step 13
exit
Example:
Switch# exit

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
Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
37-14
Chapter 37 Configuring Bidirection Forwarding Detection
Purpose
Enables BFD on the interface.
Exits interface configuration mode and returns to global
configuration mode.
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.
Specifies a static route BFD neighbor.
Exits global configuration mode and returns to privileged
EXEC mode.
(Optional) Displays static route database information.
(Optional) Displays information about the static BFD
configuration from the configured BFD groups and
nongroup entries.
Exits privileged EXEC mode and returns to user EXEC
mode.
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