Chapter 2 Ip Performance Configuration; Ip Performance Overview; Introduction To Tcp Attributes; Introduction To Fib - H3C S7500 Series Operation Manual

Operation Manual – IP Address-IP Performance-IPX
H3C S7500 Series Ethernet Switches

Chapter 2 IP Performance Configuration

When configuring IP performance, go to these sections for information you are
interested in:

IP Performance Overview

IP Performance Configuration Task List
Configuring TCP Attributes
Configuring to Send Special IP Packets to CPU
Configuring to Forward Layer 3 Broadcast Packets
Displaying and Maintaining IP Performance Configuration
Troubleshooting IP Performance Configuration
2.1 IP Performance Overview

2.1.1 Introduction to TCP Attributes

IP performance configuration refers to TCP attribute configuration. The TCP attributes
that can be configured include:
synwait timer: This timer is started when TCP sends a syn packet. If no response
packet is received before the timer times out, the TCP connection will be
terminated. The timeout of the synwait timer ranges from 2 to 600 seconds and is
75 seconds by default.
finwait timer: This timer is started when the TCP connection turns from the
FIN_WAIT_1 state to the FIN_WAIT_2 state. If no FIN packet is received before
the timer times out, the TCP connection will be terminated. The timeout of the
finwait timer ranges from 76 to 3,600 seconds and is 675 seconds by default.
The connection-oriented socket receive/send buffer size ranges from 1 to 32 KB
and is 8 KB by default.

2.1.2 Introduction to FIB

Every switch stores a forwarding information base (FIB). An 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. For routing and routing tables, refer to the Routing Protocol module of this
manual.
Chapter 2 IP Performance Configuration
2-1