2-12 IP Performance ConfigurationIP Performance OverviewIntroduction to IP Performance ConfigurationIn some network environments, you need to adjust the IP parameters to achieve best networkperformance. The IP performance configuration supported by Switch 4210 Family includes:z Configuring TCP attributesz Disabling ICMP to send error packetsIntroduction to FIBEvery switch stores a forwarding information base (FIB). FIB is used to store the forwarding informationof 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 PerformanceIntroduction to IP Performance Configuration TasksTable 2-1 Introduction to IP performance configuration tasksConfiguration task DescriptionConfiguring TCP Attributes OptionalDisabling ICMP to Send Error Packets OptionalConfiguring TCP AttributesTCP optional parameters that can be configured include:z synwait timer: When sending a SYN packet, TCP starts the synwait timer. If no response packetsare received before the synwait timer times out, the TCP connection is not successfully created.z finwait timer: When the TCP connection is changed into FIN_WAIT_2 state, finwait timer will bestarted. If no FIN packets are received within the timer timeout, the TCP connection will beterminated. If FIN packets are received, the TCP connection state changes to TIME_WAIT. Ifnon-FIN packets are received, the system restarts the timer from receiving the last non-FIN packet.The connection is broken after the timer expires.z Size of TCP receive/send buffer
