Operation Manual – IP Address-IP Performance-IPXH3C S7500 Series Ethernet Switches Chapter 2 IP Performance Configuration2-1Chapter 2 IP Performance ConfigurationWhen configuring IP performance, go to these sections for information you areinterested in:z IP Performance Overviewz IP Performance Configuration Task Listz Configuring TCP Attributesz Configuring to Send Special IP Packets to CPUz Configuring to Forward Layer 3 Broadcast Packetsz Displaying and Maintaining IP Performance Configurationz Troubleshooting IP Performance Configuration2.1 IP Performance Overview2.1.1 Introduction to TCP AttributesIP performance configuration refers to TCP attribute configuration. The TCP attributesthat can be configured include:z synwait timer: This timer is started when TCP sends a syn packet. If no responsepacket is received before the timer times out, the TCP connection will beterminated. The timeout of the synwait timer ranges from 2 to 600 seconds and is75 seconds by default.z finwait timer: This timer is started when the TCP connection turns from theFIN_WAIT_1 state to the FIN_WAIT_2 state. If no FIN packet is received beforethe timer times out, the TCP connection will be terminated. The timeout of thefinwait timer ranges from 76 to 3,600 seconds and is 675 seconds by default.z The connection-oriented socket receive/send buffer size ranges from 1 to 32 KBand is 8 KB by default.2.1.2 Introduction to FIBEvery switch stores a forwarding information base (FIB). An FIB is used to store theforwarding information of the switch and guide Layer 3 packet forwarding.You can know the forwarding information of the switch through the FIB table. Each FIBentry includes: destination address/mask length, next hop, current flag, timestamp, andoutbound interface.When the switch is running normally, the contents of the FIB and the routing table arethe same. For routing and routing tables, refer to the Routing Protocol module of thismanual.
