Administrator Guide

Command Modes
CONFIGURATION
Command History
Version Description
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.
9.3(0.0) Introduced on the S4810, S4820T, S6000, and Z9000 platforms.
Usage Information You can congure the amount of time for which the device must wait before it attempts to establish a TCP
connection. Using this capability, you can limit the wait times for TCP connection requests. Upon responding to the
initial SYN packet that requests a connection to the router for a specic 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 conguration 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-specic. For command information about other platforms, see the relevant Dell Networking
OS Command Line Reference Guide.
Version Description
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.
782 IPv4 Routing