Users Guide

responding to the initial SYN packet that requests a connection to the router for a specific service (such
as SSH or BGP) with a SYN ACK, the router waits for a period of time for the ACK packet to be sent
from the requesting host that will establish the TCP connection.
ip unknown-unicast
Enable IPv4 catch-all route.
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
This guide is platform-specific. For command information about other platforms, see the relevant Dell
EMC Networking OS Command Line Reference Guide.
Version Description
9.10(0.1) Introduced on the S6010-ON and S4048T-ON.
9.10(0.0) Introduced on the S3148.
9.10(0.0) Introduced on the S6100–ON.
9.8(2.0) Introduced on the S3100 series.
9.8(1.0) Introduced on the Z9100–ON.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Introduced on the S6000-ON.
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.
ipv4 unicast-host-route
Enable programming of IPv4 /32 route prefixes in L3 host table.
Syntax
[no] ipv4 unicast-host-route
Defaults Disabled by default. By default, all the IPv4 route prefixes are installed only in the LPM table.
Command Modes CONFIGURATION
Command
History
Version Description
9.10(0.1) Introduced on the S6010-ON and S4048T-ON.
754 IPv4 Routing