Sunday, April 15, 2012

Bidirectional Forwarding Detection (BFD)

Bidirectional Forwarding Detection (BFD) is a network protocol used to detect link failure between two nodes. This is great features used for link detection as it even detect failure for you on Layer-1 where mostly detection is not possible like on VC, tunnels, MPLS-LSP, Ethernet etc.

When BFD session is establishes between two nodes, & if there are more than twlo links exists b/w that two nodes so BFD can be used to monitor the session for these two nodes. BFD does not have a discovery mechanism, sessions must be explicitly configured between endpoints. For example, on Huawei NE40E, we can do like:

bfd to-NameOfNode-001 bind peer-ip default-ip interface GigabitEthernet1/1/1
discriminator local 809
discriminator remote 908
min-tx-interval 60
min-rx-interval 60
process-interface-status
commit


BFD may &/or can be used on many different transport mechanisms and layers. For this it needs to be encapsulated by whatever transport it uses. For example, MPLS-LSP, OSPF, IS-IS Protocols that support some form of adjacency setup.

BFD can be used in either asynchronous mode and demand mode.

I hope this will be informative for you.

Cheers :)

6 comments:

oki said...

hi Sohail,

Can we use bfd between huawei NE40-E and cisco 7600 series devices

Oki said...

hi Sohail,

Can we use bfd between huawei NE40-E and cisco 7600 series devices ?
and how about the configuration in Cisco and Huawei ?

Thanks
Oki

Sohail Akhtar said...

Huawei Configuration

1. Huawei Configuration for an Interface:
Configure BFD to support Protocol
isis 50
bfd all-interface enable
bfd all-interface min-tx-interval 50 min-rx-interval 50

2. Configure BFD on Interface
bfd to-NameOfNode-001 bind peer-ip default-ip interface GigabitEthernet1/1/1
discriminator local 809
discriminator remote 908
min-tx-interval 60
min-rx-interval 60
process-interface-status
commit
----------------------------------
Cisco Configuration:

1. Configuring BFD Session Parameters on the Interface

Router# configure terminal
Router(config)# interface fastethernet 0/1/6
Router(config-if)# bfd interval 50 min_rx 50 multiplier 5 // Enable BFD on interface

2. Configuring BFD Support for Routing Protocols
1. enable
2. configure terminal
3. router isis area-tag
4. bfd all-interfaces
5. exit
6. interface type number
7. isis bfd [disable] //if you want to disable any single interface
8. end

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