3Com Switch 4210 9-Port, Руководство по настройке

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8
IP P
ERFORMANCE
C
ONFIGURATION
IP Performance
Overview
Introduction to IP
Performance
Configuration
In some network environments, you need to adjust the IP parameters to achieve
best network performance. The IP performance configuration supported by Switch
4210 Family includes:
■
Configuring TCP attributes
■
Disabling ICMP to send error packets
Introduction to the
Forwarding Table
Every switch has a forwarding table, or forwarding information base (FIB). FIB is
used to store the forwarding information of the switch and guide Layer 3 packet
forwarding.
You can know the forwarding information of the switch through the FIB table.
Each FIB entry includes: destination address/mask length, next hop, current flag,
timestamp, and outbound interface.
When the switch is running normally, the contents of the FIB and the routing table
are the same.
Configuring IP
Performance
Introduction to IP
Performance
Configuration Tasks
Configuring TCP
Attributes
TCP optional parameters that can be configured include:
■
synwait timer: When sending a SYN packet, TCP starts the synwait timer. If no
response packets are received before the synwait timer times out, the TCP
connection is not successfully created.
■
finwait timer: When the TCP connection is changed into FIN_WAIT_2 state,
finwait timer will be started. If no FIN packets are received within the timer
timeout, the TCP connection will be terminated. If FIN packets are received, the
TCP connection state changes to TIME_WAIT. If non-FIN packets are received,
Table 51 Introduction to IP performance configuration tasks
Configuration task Description Related section
Configure TCP attributes Optional “Configuring TCP Attributes”
Disable ICMP to send error packets Optional “Disabling ICMP to Send Error
Packets”