Configuring Many-To-One Vlan Mapping; Configuring Many-To-One Vlan Mapping In A Network With Dynamic Ip Address Assignment - HP 6125XLG Configuration Manual

Configuring many-to-one VLAN mapping

Configure many-to-one VLAN mapping on campus switches (see
traffic from different users in one VLAN.
Configuring many-to-one VLAN mapping in a network with
dynamic IP address assignment
In a network where IP addresses are dynamically assigned, configure many-to-one VLAN mapping with
DHCP snooping.
The switch replaces the SVLAN tag of the downlink traffic with the associated CVLAN tag based on the
DHCP snooping entry lookup.
Configuration restrictions and guidelines
When you use this method to configure many-to-one VLAN mapping, follow these restrictions and
guidelines:
Before configuring many-to-one VLAN mapping, create the original VLANs and the translated
•
VLAN.
• To ensure correct traffic forwarding from the service provider network to the customer network, do
not configure many-to-one VLAN mapping together with uRPF. For more information about uRPF,
see Security Configuration Guide.
To modify many-to-one VLAN mapping, first use the reset dhcp snooping binding command to
•
clear the DHCP snooping entries.
Configuration task list
Tasks at a glance
•
(Required.)
•
(Required.)
•
(Required.)
•
(Required.)
Enabling DHCP snooping
Step
1. Enter system view.
2. Enable DHCP
snooping.
Enabling ARP detection
Enable ARP detection for the original VLANs and the translated VLANs.
To enable ARP detection:
Enabling DHCP snooping
Enabling ARP detection
Configuring the customer-side port
Configuring the network-side port
Command
system-view
dhcp snooping enable
Figure
Remarks
N/A
By default, DHCP snooping is disabled.
For more information about DHCP snooping
configuration commands, see Layer 3—IP
Services Command Reference.
208
55) to transmit the same type of