Cisco ASR 1000 Series Configuration Guide

PurposeCommand or Action
Sets the MTU size of IP packets, in bytes, sent on an interface.
ip mtu bytes
Example:
Device(config-if)# ip mtu 1492
Step 5
Exits to global configuration mode.end
Example:
Device(config-if)# end
Step 6
Verifying TCP Performance Parameters
SUMMARY STEPS
1.
show tcp [line-number] [tcb address]
2.
show tcp brief [all | numeric]
3.
debug ip tcp transactions
4.
debug ip tcp congestion
DETAILED STEPS
Step 1
show tcp [line-number] [tcb address]
Displays the status of TCP connections. The arguments and keyword are as follows:
• line-number—(Optional) Absolute line number of the Telnet connection status.
• tcb—(Optional) Transmission control block (TCB) of the Explicit Congestion Notification (ECN)-enabled
connection.
• address—(Optional) TCB hexadecimal address. The valid range is from 0x0 to 0xFFFFFFFF.
The following sample output from the show tcp tcb command displays detailed information about an ECN-enabled
connection that uses a hexadecimal address format:
Example:
Device# show tcp tcb 0x62CD2BB8
Connection state is LISTEN, I/O status: 1, unread input bytes: 0
Connection is ECN enabled
Local host: 10.10.10.1, Local port: 179
Foreign host: 10.10.10.2, Foreign port: 12000
Enqueued packets for retransmit: 0, input: 0 mis-ordered: 0 (0 bytes)
Event Timers (current time is 0x4F31940):
Timer Starts Wakeups Next
Retrans 0 0 0x0
TimeWait 0 0 0x0
IP Application Services Configuration Guide, Cisco IOS XE Release 3S (Cisco ASR 1000)
33
Configuring TCP
Verifying TCP Performance Parameters

Cisco ASR 1000 Series Specifications

General

Brand	Cisco
Model	ASR 1000 Series
Category	Network Router
Language	English