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5-7
Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x
OL-23435-03
Chapter 5 Configuring Bidirectional Forwarding Detection
Configuring BFD
Configuration Hierarchy
You can configure BFD at the global level and at the interface or subinterface level (for physical
interfaces and port channels). The interface or sub-interface configuration overrides global
configuration. On supported interfaces, the subinterface-level configuration overrides the interface or
port channel configuration unless subinterface optimization is enabled. See the “Optimizing BFD on
Subinterfaces” section on page 5-13 for more information.
Note Using BFD per-link mode and sub-interface optimization simultaneously on a Layer 3 port channel is
not supported.
For physical ports that are members of a port channel, the member port inherits the master port channel
BFD configuration. The member port subinterfaces can override the master port channel BFD
configuration, unless subinterface optimization is enabled.
Task Flow for Configuring BFD
Follow these steps to configure BFD:
Step 1 Enabling the BFD Feature.
Step 2 Configuring Global BFD Parameters or Configuring BFD on an Interface.
Step 3 Configuring BFD Support for Routing Protocols.
Enabling the BFD Feature
You must enable the BFD feature before you can configure BFD on an interface and protocol within a
device (VDC).
BEFORE YOU BEGIN
Ensure that you are in the correct VDC (or use the switchto vdc command).
SUMMARY STEPS
1. configure terminal
2. feature bfd
3. (Optional) show feature | include bfd
4. (Optional) copy running-config startup-config
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