3Com 8807 - Page 768

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768 CHAPTER 66: NTP CONFIGURATION

# Set the key.

[3Com1] ntp-service authentication-keyid 42 authentication-mode md5

aNiceKey

# Configure the key as reliable.

[3Com1] ntp-service reliable authentication-keyid 42

Main Page

Default Chapter1
- Default Chapter1
  - Configuration Guide1
  - Table of Contents3
- About this Guide15
  - Conventions15
  - Related Documentation16
Product Overview17
- Function Features18
Command21
- Command Line View21
- Features and Functions of Command Line29
Logging in to Switch33
- Setting up Configuration Environment through the Console Port33
- Setting up Configuration Environment through Telnet34
- Setting up Configuration Environment through Modem Dial-Up37
User Interface Configuration39
- User Interface Overview39
- User Interface Configuration40
- Displaying and Debugging User Interface48
Management Interface Overview49
- Management Interface Configuration49
- Configuration File Management51
CONFIGURATION FILE MANAGEMENT Configuration File Management51
7 Vlan C Onfiguration55
- VLAN Overview55
- Configuring VLAN55
Vlan C55
- Configuring Protocol-Based VLAN57
- Configuring IP Subnet-Based VLAN58
- Configuring a Super VLAN61
  - Network Diagram63
  - Configuration Procedure63
- Isolate-User-VLAN Overview65
- Isolate-Use-Vlan Configuration Task65
- Displaying and Debugging an Isolate-User-VLAN67
- Isolate-User-VLAN Configuration Example68
Ip Address71
- Introduction to IP Addresses71
- Configuring IP Address73
- Displaying IP Address76
- IP Address Configuration Example76
- Troubleshooting IP Address Configuration77
Ip Performance79
- Configuring IP Performance79
- Displaying and Debugging IP Performance79
- Troubleshooting IP Performance81
Garp&Gvrp Configuration83
- Configuring GARP83
- Configuring GVRP85
Ethernet Port Configuration89
- Ethernet Port Overview89
- Setting the Interval of Performing Statistics on Ports92
- Displaying and Debugging Ethernet Port98
- Ethernet Port Configuration Example98
- Ethernet Port Troubleshooting99
Link Aggregation101
- Overview101
- Link Aggregation Configuration104
- Displaying and Debugging Link Aggregation108
- Link Aggregation Configuration Example108
Port111
- Port Isolation Overview111
- Configuration Tasks111
- Port Isolation Configuration Example113
Mac Address Table Management115
- MAC Address Table Management Overview115
- MAC Address Table Management Configuration116
- Maximum MAC Address Number Learned by Ethernet Port and Forwarding Option Configuration117
- Configuring Max Number of MAC Addresses that Can be Learned in a VLAN118
- Displaying and Debugging MAC Address Tables119
- Resetting MAC Addresses119
- MAC Address Table Management Configuration Example119
Mstp Region - Configuration121
- Introduction to MSTP121
- Configuring MSTP132
- Displaying and Debugging MSTP150
- Typical MSTP Configuration Example152
Digest Snooping Configuration155
- Introduction to Digest Snooping155
Fast Transition159
- Introduction159
- Configuring Fast Transition160
20 Bpdu Tunnelconfiguration163
- BPDU Tunnel Overview163
- Configuring BPDU Tunnel163
- BPDU Tunnel Configuration Example164
21 Acl Configuration167
- ACL Overview167
- ACL Configuration Tasks169
- Displaying and Debugging ACL Configurations176
- ACL Configuration Example177
22 Qos Configuration181
- Qos Overview181
- Introduction to Qos Configuration Based on Port Groups184
- Qos Configuration188
- Qos Configuration Example202
Logon209
- Configuration209
- Overview209
- Configuring ACL for Telnet/Ssh Users209
- Configuring ACL for SNMP Users212
Vlan-Aconfigurationl Configuration215
- VLAN-ACL Overview215
- Configuration215
26 Aaaand Radius/Hwtacacs Protocolconfiguration235
Portal267
- Portal Overview267
- Basic Portal Configuration270
- Portal Authentication-Free User and Free IP Address Configuration276
- Portal Rate Limit Function Configuration278
- Portal User Deletion278
Ip Routing Protocol Overview279
- Introduction to IP Route and Routing Table279
- Routing Management Policy282
Static Route285
- Introduction to Static Route285
- Configuring Static Route286
- Displaying and Debugging Static Route287
- Typical Static Route Configuration Example288
- Troubleshooting Static Route Faults289
30 Rip Configuration291
- Introduction to RIP291
- Configuring RIP292
- Displaying and Debugging RIP300
- Typical RIP Configuration Example300
- Troubleshooting RIP Faults301
31 Ospf Configuration303
- OSPF Overview303
- OSPF GR Overview307
- Configuring OSPF311
- Displaying and Debugging OSPF330
- Typical OSPF Configuration Example331
- Troubleshooting OSPF Faults336
32 Integrated Is-Is Configuration339
- Introduction to Integrated IS-IS339
- Routing Protocol341
- Configuring Integrated IS-IS343
- Displaying and Debugging Integrated IS-IS358
- Typical Integrated IS-IS Configuration Example359
33 Bgp Configuration361
- BGP/MBGP Overview361
- Configuring BGP364
- Displaying and Debugging BGP383
- Typical BGP Configuration Examples384
- Configure Vlan386
- Troubleshooting BGP390
Ip Routing Policy393
- Introduction to IP Routing Policy393
- Configuring IP Routing Policy394
- Displaying and Debugging the Routing Policy401
- Typical IP Routing Policy Configuration Example401
- Troubleshooting Routing Policy402
Route Capacity Configuration405
Recursive Routing Configuration407
37 Ip Multicastoverview409
- IP Multicast Overview409
- Implementation of IP Multicast411
- RPF Mechanism for IP Multicast Packets414
Static Multicast Mac Address Configuration417
- Static Multicast MAC Address Overview417
- Configuring a Static Multicast MAC Address417
- Displaying and Maintaining Static Multicast MAC Address Configuration418
39 Igmp Snoopingconfiguration419
- IGMP Snooping Overview419
- IGMP Snooping Configuration422
- Multicast Static Routing Port Configuration426
- Displaying and Maintaining IGMP Snooping427
- IGMP Snooping Configuration Example427
- Troubleshooting IGMP Snooping428
Multicast Vlan Configuration431
- Multicast VLAN Overview431
- Multicast VLAN Configuration Example432
Ommon Ulticast Configuration435
- Introduction to Common Multicast Configuration435
- Common Multicast Configuration435
- Managed Multicast Configuration437
- Configuring Broadcast/Multicast Suppression439
- Displaying and Debugging Common Multicast Configuration440
Igmp C441
- IGMP Overview441
- Introduction to IGMP Proxy442
- IGMP Configuration444
- Displaying and Debugging IGMP453
Pim-DM C455
- PIM-DM Overview455
- PIM-DM Configuration456
- Displaying and Debugging PIM-DM459
- PIM-DM Configuration Example460
Pim-Sm C463
- PIM-SM Overview463
- PIM-SM Configuration465
- Displaying and Debugging PIM-SM469
  - PIM-SM Configuration Example469
Msdp C473
- MSDP Overview473
- MSDP Configuration476
- Displaying and Debugging MSDP482
- MSDP Configuration Examples483
46 Mbgp M Ulticastextensionconfiguration493
- MBGP Multicast Extension Overview493
- MBGP Multicast Extension Configuration494
- Displaying and Debugging MBGP Configuration501
- MBGP Multicast Extension Configuration Example501
Mpls a507
- MPLS Overview507
- MPLS Basic Concepts507
- MPLS Architecture510
Mpls Basic Capability Configuration515
- MPLS Basic Capability Overview515
- MPLS Configuration515
- LDP Configuration517
- Displaying and Debugging MPLS Basic Capability521
- Typical MPLS Configuration Example523
- Troubleshooting MPLS Configuration526
Bgp/Mpls Vpn C529
- BGP/MPLS VPN Overview529
- BGP/MPLS VPN Configuration537
- Displaying and Debugging BGP/MPLS VPN550
- Typical BGP/MPLS VPN Configuration Example552
- Troubleshooting BGP/MPLS VPN Configuration599
Card Intermixing for Mpls Support601
- Overview601
- Restrictions in Intermixing Networking602
- Intermixing Configuration Task603
- Restrictions in Networking of Various MPLS Cards611
Mpls Vll613
- MPLS L2VPN Overview613
- CCC MPLS L2VPN Configuration616
- Martini MPLS L2VPN Configuration621
- Kompella MPLS L2VPN Configuration625
- Displaying and Debugging MPLS L2VPN629
- Troubleshooting MPLS L2VPN630
52 Vpls C Onfiguration633
- VPLS Overview633
- Basic VPLS Network Architectures634
- VPLS Operational Principle635
- Concepts Related to VPLS637
- VPLS Basic Configuration638
- Displaying and Debugging VPLS646
- VPLS Basic Configuration Example646
- Troubleshooting VPLS650
53 Vrrp C Onfiguration653
- Introduction to VRRP653
- Configuring VRRP654
- Displaying and Debugging VRRP659
- VRRP Configuration Example660
- Networking Diagram661
- Troubleshooting VRRP664
54 Ha Configuration667
- Introduction to HA667
- Configuring HA667
- Displaying and Debugging HA Configuration669
- HA Configuration Example670
55 Arp Configuration671
- Introduction to ARP671
- Configuring ARP672
- Displaying and Debugging ARP675
Arp Table677
- Introduction to ARP Table Size Configuration677
- Configuring ARP Table Size Dynamically678
- Displaying ARP Table Size Configuration678
- Configuration Example679
57 Dhcp C Onfiguration681
- Some Concepts about DHCP681
- Configuring General DHCP684
- Configuring DHCP Server686
- Configuring DHCP Relay698
- DHCP Option 82 Configuration702
58 Dns Configuration709
- Introduction to DNS709
- Configuring Static Domain Name Resolution710
- Configuring Dynamic Domain Name Resolution710
- Displaying and Debugging Domain Name Resolution711
- DNS Configuration Example711
- Troubleshooting Domain Name Resolution Configuration712
Netstream713
- Netstream Overview713
- Netstream Configuration714
- Netstream Configuration Examples716
Ndp C719
- Introduction to NDP719
- Introduction to NDP Configuration Tasks719
- NDP Configuration Example721
61 Poe Configuration723
- Poe Overview723
- Poe Configuration724
- Comprehensive Configuration Example726
O E Psu Supervision729
- Introduction to Poe PSU Supervision729
- AC Input Alarm Thresholds Configuration729
- DC Output Alarm Thresholds Configuration730
- Displaying Poe Supervision Information731
- Poe PSU Supervision Configuration Example731
Udp Helper733
- Overview733
- Configuring UDP Helper733
- Displaying UDP Helper735
Snmp C737
- SNMP Overview737
- SNMP Versions and Supported MIB737
- Configuring SNMP738
- Displaying and Debugging SNMP743
- SNMP Configuration Example743
Rmon C747
- RMON Overview747
- Configuring RMON747
- Displaying and Debugging RMON750
- RMON Configuration Example751
66 Ntp Configuration753
- Brief Introduction to NTP753
- NTP Configuration755
- Displaying and Debugging NTP760
- NTP Configuration Example761
- Network Requirements765
Ssh Terminal769
- SSH Terminal Service769
- SFTP Service781
File789
- File System Configuration789
Device Management793
- Device Management Overview793
- Device Management Configuration793
- Displaying and Debugging Device Management796
- Device Management Configuration Example796
70 Ftp&Tftp Configuration801
- FTP Configuration801
- TFTP Configuration806
Information Center811
- Information Center Function811
System Aintenance and835
- Basic System Configuration835
- Displaying the Status and Information of the System836
- System Debugging836
- Testing Tools for Network Connection838
Protocol841
- Introduction to Protocol Port Security841
Packet843
- Introduction to Egress Packet Statistics843
Ethernet845
- Ethernet Port Loopback Detection Function845
- Configuring the Loopback Detection Function845
- Displaying and Maintaining the Loopback Detection Function845
Qin847
- Qinq Overview847
- VLAN VPN Configuration849
- Traffic Classification-Based Nested VLAN Configuration850
- Adjusting TPID Values for Qinq Packets853
- VLAN-VPN Tunnel Configuration855
77 Nqa Configuration861
- Introduction to NQA861
- NQA Configuration861
- Displaying and Maintaining NQA865
Password867
- Introduction to Password Control Configuration867
Acronyms877

3Com 8807 - Page 768

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