H3C Technologies H3C S10500 Series Switches - Manual (Page 211)

200
To do... Use the command... Remarks
Assign the port to
SVLANs port trunk permit vlan { vlan-id-list
| all } Required
By default, a trunk port is in only VLAN 1.
Configuring many-to-one VLAN mapping
Perform many-to-one VLAN mapping on campus switches (see Figure 63 ) to transmit the same type of
traffic from different users in one VLAN.
Perform these tasks to configure many-to-one VLAN mapping:
Task Description
Enabling DHCP snooping Enables DHCP snooping globally (required).
Enabling ARP detection in SVLANs Enables ARP detection in all SVLANs (required).
Configuring an uplink policy Configures an uplink policy for the customer-side port (required).
Configuring the customer-side port
Configures VLAN and other settings required for many-to-one
VLAN mapping (required).
Configuring the network-side port
Configures VLAN and other settings required for many-to-one
VLAN mapping (required).
CAUTION:
Before changing VLAN mappings on a port, clear all DHCP snooping entries by using the reset
dhcp-snooping command (see
Layer 3—IP Services Command Reference).
Configuration prerequisites
Before configuring many-to-one VLAN mapping:
• Make sure that all home users obtain IP addresses through DHCP. For how to assign IP addresses
through DHCP, see Layer 3—IP Services Configuration Guide.
• Create CVLANs and SVLANs, and plan CVLANs-to-SVLAN mappings.
Enabling DHCP snooping
Follow these steps to enable DHCP snooping:
To do... Use the command... Remarks
Enter system view system-view —
Enable DHCP snooping dhcp-snooping
Required
Disabled by default.
Enabling ARP detection in SVLANs
The ARP detection function enables a switch to modify the VLAN attributes of ARP packets, which is
impossible under the normal ARP packet processing procedure. For more information about ARP
detection, see Security Configuration Guide.
Follow these steps to enable ARP detection in all SVLANs:
To do... Use the command... Remarks
Enter system view system-view —