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5-6
Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x
OL-23435-03
Chapter 5 Configuring Bidirectional Forwarding Detection
Default Settings
Note Using BFD per-link mode and sub-interface optimization simultaneously on a Layer 3 port
channel is not supported.
• HSRP for IPv4 is supported with BFD. HSRP for IPv6 is not supported with BFD.
• BFD packets generated by supported the Cisco NX-OS device linecards are sent with COS 6/DSCP
CS6. The DSCP/COS values for BFD packets are not user configurable.
Default Settings
Table 5-1 lists the default settings for BFD parameters.
Configuring BFD
This section includes the following topics:
• Configuration Hierarchy, page 5-7
• Task Flow for Configuring BFD, page 5-7
• Enabling the BFD Feature, page 5-7
• Configuring Global BFD Parameters, page 5-8
• Configuring BFD on an Interface, page 5-9
• Configuring BFD on a Port Channel, page 5-11
• Configuring BFD Echo Function, page 5-12
• Optimizing BFD on Subinterfaces, page 5-13
• Configuring BFD Support for Routing Protocols, page 5-14
Table 5-1 Default BFD Parameters
Parameters Default
BFD feature Disabled
Required minimum receive interval 50 milliseconds
Desired minimum transmit interval 50 milliseconds
Detect multiplier 3
Echo function Enabled
Mode Asynchronous
Port channel Logical mode (one session per source-destination
pair address).
Slow timer 2000 milliseconds
Subinterface optimization Disabled
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