DELL S50V User Manual

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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 

, as shown in 

.

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 

, as shown in 

.

1

Establish sessions with all IS-IS neighbors out of an 
interface.

INTERFACE

1

Change parameters for all IS-IS 
sessions.

bfd all-neighbors interval milliseconds

 

min_rx milliseconds multiplier value role 

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ROUTER-ISIS

1

Change parameters for all IS-IS 
sessions out of an interface.

isis bfd all-neighbors interval milliseconds

 

min_rx milliseconds multiplier value role 

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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