Administrator Guide

Version Description
8.1.1.0 Introduced on the E-Series.
7.6.1.0 Introduced on the S-Series.
7.5.1.0 Introduced on the C-Series.
pre-6.1.1.0 Introduced on the E-Series.
ip tcp initial-time
Define the wait duration in seconds for the TCP connection to be established. This command is supported on the , , S6000, and platforms.
Syntax
ip tcp initial-time <8-75>
To restore the default behavior, which causes the wait period to be set as 8 seconds, use the no ip tcp
initial-time command.
Parameters
<8-75> Wait duration in seconds for the TCP connection to be established.
Command Modes
CONFIGURATION
Command History
Version Description
9.10(0.1) Introduced on the S6010-ON and S4048T-ON.
9.10(0.0) Introduced on the S6100–ON.
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 configure 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 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.
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
746 IPv4 Routing