Default Bfd Configuration; Default Bfd Configuration Guidelines - Cisco ME 3400 Software Configuration Manual

Configuring BFD
To run BFD on a switch, you need to configure basic BFD interval parameters on BFD interfaces, enable
routing on the switch, and enable one or more one routing protocol clients for BFD. You also need to
confirm that Cisco Express Forwarding (CEF) is enabled (the default) on participating switches.
For more detailed configuration, see the Bidirectional Forwarding Detection feature module at this URL:
http://www.cisco.com/en/US/docs/ios/12_0s/feature/guide/fs_bfd.html
For details on the commands, use the Master Index to the Cisco IOS Command List for Release 12.4. at
this URL:
http://www.cisco.com/en/US/docs/ios/mcl/allreleasemcl/all_book.html
These sections describe configuring BFD:
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Default BFD Configuration

No BFD sessions are configured. BFD is disabled on all interfaces.
When configured, BFD version 1 is the default, but switches negotiate for version. Version 0 is also
supported.
Standby BFD (for HSRP) is enabled by default.
Asynchronous BFD echo mode is enabled when a BFD session is configured.

Default BFD Configuration Guidelines

The switch supports a maximum of 28 BFD sessions at one time.
To run BFD on a switch:
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We recommend that you configure the BFD interval parameters on an interface before configuring the
Note
routing protocol commands, especially when using EIGRP.
Confirm that CEF is enabled on participating switches (the default) as well as IP routing.
BFD is supported on physical interfaces that are configured as routing interfaces. It is not supported on
Layer 2 interfaces, pseudowires, static routes, SVI interfaces, or port channels.
Although you can configure BFD interface commands on a Layer 2 port, BFD sessions do not operate
on the interface unless it is configured as a Layer 3 interface (no switchport) and assigned an IP address.
Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
35-74
Default BFD Configuration, page 35-74
Default BFD Configuration Guidelines, page 35-74
Configuring BFD Session Parameters on an Interface, page 35-75
Enabling BFD Routing Protocol Clients, page 35-76
Configure basic BFD interval parameters on each interface over which you want to run BFD
sessions.
Enable routing on the switch. You can configure BFD without enabling routing, but BFD sessions
do not become active unless routing is enabled on the switch and on the BFD interfaces.
Enable one or more one routing protocol clients for BFD. You should implement fast convergence
for the routing protocol that you are using. See the IP routing documentation in this chapter or in the
Cisco IOS IP Configuration Guide, Release 12.2, for information on configuring fast convergence.
Chapter 35 Configuring IP Unicast Routing
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