3Com 10014298 - page 285

NTP 285

Setting the Authority to Access a Local Switch

Set the authority to access the NTP services on a local switch. This is a basic

security measure. An access request will be matched with peer, serve, serve

only, and query only in an ascending order of the limitation. The first matched

authority will be granted.

Perform the following configurations in system view.

IP address ACL number is specified through the acl-number parameter and ranges

from 2000 to 2999. The meanings of other authority levels are as follows:

■query: Allow control query for the local NTP service only.

■synchronization: Allow request for local NTP time service only.

■serve: Allow local NTP time service request and control query. However, the

local clock will not be synchronized by a remote server.

■peer: Allow local NTP time service request and control query. And the local

clock will also be synchronized by a remote server.

Setting Maximum Local Sessions

This configuration task sets the maximum local sessions.

Perform the following configurations in system view.

number specifies the maximum number of local sessions, ranges from 0 to 100,

and defaults to 100.

Displaying and Debugging NTP

After completing the previous configurations, you can use the display command

to show how NTP runs and verify the configurations according to the outputs. You

can use the debugging command, in user view, to debug NTP. See Table 333 for

the details of these commands.

Tabl e 331 Setting the Authority to Access a Local Ethernet Switch

Operation Command

Set authority to access a local Ethernet switch ntp-service access { query |

synchronization | serve | peer }

acl-number

Cancel settings of the authority to access a

local Ethernet switch

undo ntp-service access { query |

synchronization | serve | peer }

Tabl e 332 Setting the Maximum Local Sessions

Operation Command

Set the maximum local sessions ntp-service max-dynamic-sessions

number

Resume the maximum number of local

sessions

undo ntp-service

max-dynamic-sessions

Tabl e 333 Displaying and Debugging NTP

Operation Command

Display the status of NTP service display ntp-service status

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: