Reference Guide

ip unknown-unicast
Enable IPv4 catch-all route.
S6000
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 9.4(0.0) Introduced on the S–Series.
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.
ipv6 unknown-unicast
Disable soft forwarding of unknown IPv6 destination packets.
S6000 MXL Switch
Syntax
[no] ipv6 unknown-unicast
Defaults Soft forwarding is enabled.
Command
Modes
CONFIGURATION
Command
History
Version 9.4(0.0) Introduced on the S4810, S4820T, S6000, Z9000, and MXL
Switch.
Usage
Information
All the default catch-all entries in the longest prefix match (LPM) table collect and
transmit all unresolved IPv6 packets to the CPU, even if they are destined for
unknown destinations.
1430
Virtual Routing and Forwarding (VRF)