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5-4
Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x
OL-23435-03
Chapter 5 Configuring Bidirectional Forwarding Detection
Licensing Requirements for BFD
Security
Cisco NX-OS uses the packet Time to Live (TTL) value to verify that the BFD packets came from an
adjacent BFD peer. For all asynchronous and echo request packets, the BFD neighbor sets the TTL value
to 255 and the local BFD process verifies the TTL value as 255 before processing the incoming packet.
For the echo response packet, BFD sets the TTL value to 254.
Beginning with Cisco NX-OS Release 5.2, you can configure SHA-1 authentication of BFD packets.
High Availability
BFD supports stateless restarts and in-service software upgrades (ISSUs). ISSU allows you to upgrade
software without impacting forwarding. After a reboot or supervisor switchover, Cisco NX-OS applies
the running configuration and BFD immediately sends control packets to the BFD peers.
Virtualization Support
BFD supports virtual routing and forwarding instances (VRFs). VRFs exist within virtual device
contexts (VDCs). By default, Cisco NX-OS places you in the default VDC and default VRF unless you
specifically configure another VDC and VRF. For more information, see the Cisco Nexus 7000 Series
NX-OS Virtual Device Context Configuration Guide, Release 5.x.
Licensing Requirements for BFD
The following table shows the licensing requirements for this feature:
Prerequisites for BFD
BFD has the following prerequisites:
• You must enable the BFD feature (see the “Enabling the BFD Feature” section on page 5-7).
• For any client protocols that you want to enable BFD on, you enable BFD in that client protocol.
See the “Configuring BFD Support for Routing Protocols” section on page 5-14.
• Disable Internet Control Message Protocol (ICMP) redirect messages on a BFD-enabled interfaces.
• Disable the IP packet verification check for identical IP source and destination addresses in the
default VDC.
• See other detailed prerequisites that are listed with the configuration tasks.
Product License Requirement
Cisco NX-OS BFD requires no license. Any feature not included in a license package is bundled with the Cisco NX-OS
system images and is provided at no extra charge to you. For a complete explanation of the Cisco NX-OS
licensing scheme, see the Cisco NX-OS Licensing Guide.
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