3Com 10014298 IP Performance

IP Performance 77

debugging command to output the debugging information to the console. In this

way, you can view the detailed information of all DHCP packets on the console

while applying for the IP address, thereby, conveniently locating the problem.

IP Performance IP performance configuration includes:

■Configuring TCP Attributes

■Configuring Special IP Packet Transmission to the CPU

■Configuring L3 Broadcast Forwarding

■Displaying and Debugging IP Performance

■Troubleshooting IP Performance

Configuring TCP

Attributes

The TCP attributes that can be configured include:

■synwait timer: When sending the syn packets, TCP starts the synwait timer. If

response packets are not received before synwait timeout, the TCP connection

will be terminated. The timeout of synwait timer ranges 2 to 600 seconds and

it is 75 seconds by default.

■finwait timer: When the TCP connection state turns from FIN_WAIT_1 to

FIN_WAIT_2, finwait timer will be started. If FIN packets are not received before

finwait timer timeout, the TCP connection will be terminated. Finwait ranges

76 to 3600 seconds and it is 675 seconds by default.

■The receiving/sending buffer size of connection-oriented Socket is in the range

from 1 to 32K bytes and is 4K bytes by default.

Perform the following configuration in System view.

By default, the TCP finwait timer is 675 seconds, the synwait timer is 75 seconds,

and the receiving/sending buffer size of connection-oriented Socket is 4K bytes.

Configuring Special IP

Packet Transmission to

the CPU

In IP packet forwarding, redirection packets, TTL timeout packets, and route

unreachable packets are often sent to CPU, which will notify the peer end for

further processing upon receiving them. Configuration errors and malicious

assaults may cause CPU overload. In this case, to maintain normal system

Tabl e 74 Configure TCP Attributes

Operation Command

Configure synwait timer time for TCP

connection establishment

tcp timer syn-timeout time-value

Restore synwait timer time for TCP connection

establishment to default value

undo tcp timer syn-timeout

Configure FIN_WAIT_2 timer time of TCP tcp timer fin-timeout time-value

Restore FIN_WAIT_2 timer time of TCP to

default value

undo tcp timer fin-timeout

Configure the Socket receiving/sending buffer

size of TCP

tcp window window-size

Restore the socket receiving/sending buffer

size of TCP to default value

undo tcp window

Contents

Main 3Com Corporation 350 Campus Drive Marlborough, MA 01752-3064 C ABOUT THIS GUIDE S YSTEM A PORT CONFIGURATION VLAN C IP ROUTING PROTOCOL OPERATION M ULTICAST P QOS/ OPERATION STP O AAA AND RADIUS OPERATION SYSTEM MANAGEMENT Page Page ABOUT THIS GUIDE This guide describes the 3Com Switch 7750 and how to configure it in version 3.0 of the software. Tabl e 2 lists the text conventions used in this book. Conventions Tabl e 1 Notice Icons Table 2 Text Conventions 1 Product Overview Configuring the Switch 7750 Figure 1 Setting Up the Local Configuration Environment Through the Console Port Table 3 Function Features (continued) Page Page Page Ethernet Page Page Page Page Page Page Page Page Page Page Page Command Line Interface Page Tabl e 20 Function Feature of Command View Page Page Tabl e 23 Editing Functions Tabl e 24 Display Functions Table 22 Retrieve History Command Page 2 Ethernet Port Overview Page Page Page Page Page Page Configuring Link Aggregation Page Page Page Page Page Page Perform the following configuration in Ethernet port view. Tabl e 44 Configure Port Priority Tabl e 45 Display and Debug Link Aggregation Page Page Page 3 VLAN Overview Configuring VLANs Page Page Page Page Page Page 3Configure the protocol VLAN on port G1/0/1 Configuring GARP/GVRP Page Page Page Page Page 4 Configuring IP Address Page Page Configuring Address Resolution Protocol (ARP) Page DHCP Relay Page Page Page Page IP Performance Page Page Page 5 IP Routing Protocol Overview Page Page Static Routes Page Page Page Page RIP Page Page Page Page Page Page Page Page Page IP Routing Policy Page Page Page Page Page Route Capacity Page Page Page 6 IP Multicast Overview Page Page Page Page Configuring Common Multicast Page Configuring IGMP Page Page Page Page Page Page Page IGMP Snooping Page Page Page Page Page Configuring PIM-DM Page Page Page Page Figure 33 PIM-DM Configuration Networking 2Enable PIM-DM. Table 144 Displaying and Debugging PIM-DM Configuring PIM-SM Page Page Page Page Page Page Page Execute the debugging command in user view to debug PIM-SM. Figure 35 PIM-SM Configuration Networking Configure Switch A 1Enable PIM-SM. Tabl e 157 Display and Debug PIM-SM Configure Switch B 1Enable PIM-SM. 2Configure the C-BSR. 3Configure the C-RP. 4Configure PIM domain border. GMRP Page Page 7 ACL Overview Page Configuring ACLs Page Page Page ACL Configuration Examples Page Configuring QoS Page Page Page Page Page Page Page Page Page Tabl e 183 Configuring Traffic Statistics Tabl e 184 Display and Debug QoS Page Page Page Page Page Page Page Configuring ACL Control Page Page Page Page Page 8 STP Overview Configuring STP Page Page Page Page MSTP Overview Page Page Configuring MSTP Page Page Page Page Page Page Page Page Page Perform the following configuration in system view. By default, the switch calculates the default Path Cost of a port by the IEEE 802.1t standard. Tabl e 204 Specifying the Standard To Be Followed in Path Cost Calculation Tabl e 205 Cost Corresponding to the Port Speed of Different Standard Page Page Page Page Page Digest Snooping Page 9 IEEE 802.1x Page Page Page Page Page Page Page Implementing the AAA and RADIUS Protocols Page Configuring AAA Page Page Configuring the RADIUS Protocol Page Page Page Page Page Page Page Page Page Configuring HWTACACS Page Page Page Page Page Page The real-time accounting interval defaults to 12 minutes. Displaying and Debugging the AAA, RADIUS, and HWTACACS Protocols Table 255 Numbers of users and the recommended intervals Tabl e 256 Displaying and Debugging AAA and RADIUS/HWTACACS Protocol AAA, RADIUS, and HWTACACS Protocol Configuration Examples Page Page Troubleshooting AAA, RADIUS, and HWTACACS Configurations Page 11 File System Page Page Page Page Page Managing the MAC Address Table Page Page Page Managing Devices Page Maintaining and Debugging the System Page Page Page Page Page Page The system assigns a channel in each output direction by default. See Tabl e 293. Tabl e 293 Numbers and Names of the Channels for Log Output Tabl e 294 Syslog-Defined Severity Table 292 Log Output (continued) Page Page SNMP Page Page Page Page Page Page Tabl e 310 Enable/Disable Transmission of Trap Information Tabl e 311 Disabling SNMP Agent Tabl e 312 Displaying and Debugging SNMP Page RMON Page Page Page NTP Page Page Page Page Page Page Page Page After the synchronization, SW77502 turns into the following status: