Administrator Guide

Virtual Routing and Forwarding (VRF)
Virtual Routing and Forwarding (VRF) allows multiple instances of a routing table to co-exist on the same router at the same
time.
Topics:
• ip unknown-unicast
• ipv6 unknown-unicast
• description
• ip vrf forwarding
• ip route-export
• ip route-import
• ipv6 route-export
• ipv6 route-import
• match source-protocol
• redistribute
• interface management
• maximum dynamic-routes
• show ip vrf
• show run vrf
ip unknown-unicast
Enable IPv4 catch-all route.
C9000 Series
Syntax
ip unknown-unicast [vrf vrf-name]
To remove the IPv4 catch-all route (0.0.0.0/0) from the LPM route forwarding table in hardware which
gets added as a default configuration after the initialization of FIB Agent module, use the no ip
unknown-unicast command.
Defaults None
Parameters
vrf vrf-name (Optional) Enter the keyword vrf followed by the name of the VRF to enable
catch-all routes corresponding to that VRF.
Command Modes CONFIGURATION
Command
History
Version Description
9.9(0.0) Introduced on the C9010.
9.7(0.1) Introduced on the S3048-ON and S4048-ON.
9.7(0.0) Introduced on the S6000-ON.
9.4(0.0) Introduced on the S–Series and Z9000.
Usage
Information
Use this command to add the IPv4 catch-all route (0.0.0.0/0) in the LPM route forwarding table if it was
deleted using the no ip unknown-unicast command previously. This will be the default configuration
after reload.
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