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194 | Bidirectional Forwarding Detection
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To establish BFD with all IS-IS neighbors out of a single interface:
View the established sessions using the command
show bfd neighbors, as shown in Figure 9-21.
Figure 9-21. Viewing Established Sessions for IS-IS Neighbors
Changing IS-IS session parameters
BFD sessions are configured with default intervals and a default role. The parameters that can be
configured are: Desired TX Interval, Required Min RX Interval, Detection Multiplier, and system role.
These parameters are configured for all IS-IS sessions or all IS-IS sessions out of an interface; if you
change a parameter globally, the change affects all IS-IS neighbors sessions. If you change a parameter at
interface level, the change affects all IS-IS sessions on that interface.
To change parameters for all IS-IS sessions:
To change parameters for IS-IS sessions on an interface:
View session parameters using the command
show bfd neighbors detail, as shown in Figure 9-8 on
page 179.
Step Task Command Syntax Command Mode
1 Establish sessions with all IS-IS neighbors out of an
interface.
isis bfd all-neighbors
INTERFACE
Step Task Command Syntax Command Mode
1 Change parameters for all IS-IS
sessions.
bfd all-neighbors interval milliseconds
min_rx milliseconds multiplier value role
[active | passive]
ROUTER-ISIS
Step Task Command Syntax Command Mode
1 Change parameters for all IS-IS
sessions out of an interface.
isis bfd all-neighbors interval milliseconds
min_rx milliseconds multiplier value role
[active | passive]
INTERFACE
R2(conf-router_isis)#bfd all-neighbors
R2(conf-router_isis)#do show bfd neighbors
* - Active session role
Ad Dn - Admin Down
C - CLI
I - ISIS
O - OSPF
R - Static Route (RTM)
LocalAddr RemoteAddr Interface State Rx-int Tx-int Mult Clients
* 2.2.2.2 2.2.2.1 Gi 2/1 Up 100 100 3 I
* 2.2.3.1 2.2.3.2 Gi 2/2 Up 100 100 3 I
IS-IS BFD Sessions Enabled