Prerequisites For Bidirectional Forwarding Detection - Cisco Catalyst 4500 series Administration Manual

Prerequisites for Bidirectional Forwarding Detection

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Prerequisites for Bidirectional Forwarding Detection
Prerequisites include:
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Restrictions for Bidirectional Forwarding Detection
Restrictions include:
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Cisco IOS Release 15.1(1)SG
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Cisco IOS Release XE 3.5.0E and IOS 15.2(1)E
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For the most accurate platform and hardware restrictions, see the Cisco IOS software release notes for
Note
your software version.
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)SG
39-2
How to Configure Bidirectional Forwarding Detection, page 39-8
Configuration Examples for Bidirectional Forwarding Detection, page 39-17
Additional References, page 39-28
IP routing must be enabled on all participating switches.
One of the IP routing protocols supported by BFD must be configured on the switches before BFD
is deployed. You should implement fast convergence for the routing protocol that you plan to use.
See the IP routing documentation for your version of Cisco IOS software for information on
configuring fast convergence. See the
on page 39-2 for more information on BFD routing protocol support in Cisco IOS software.
BFD works only for directly connected neighbors. BFD neighbors must be no more than one IP hop
away. Multihop configurations are not supported.
Cisco Catalyst 4500 series switches support up to 128 BFD sessions with a minimum hello interval
of 50 ms and a multiplier of 3. The multiplier specifies the minimum number of consecutive packets
that can be missed before a session is declared down.
If SSO is enabled on a dual RP system, the following limitations apply:
The minimum hello interval is 50 ms with a multiplier of 5 or higher.
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Smaller values may be configured but may flap during an SSO switchover.
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To enable echo mode the peer system must be configured with the no ip redirects command.
Cisco Catalyst 4500 series switches support up to 100 BFD sessions with a minimum hello interval
of 100 ms and a multiplier of 3. The multiplier specifies the minimum number of consecutive
packets that can be missed before a session is declared down.
If SSO is enabled on a dual RP system, the following limitations apply:
The minimum hello interval is 50 ms with a multiplier of 5 or higher.
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Smaller values may be configured but may flap during an SSO switchover.
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To enable echo mode the peer system must be configured with the no ip redirects command.
Chapter 39 Configuring Bidirection Forwarding Detection
"Restrictions for Bidirectional Forwarding Detection" section
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