3Com Switch 8800 Family IPsec Module Configuration and Command reference Guide

IPsecModule Configuration Commands 253
Description
Use the security-vlan command to specify all VLANs in the VLAN range are
protected by SecBlade.
Use the undo security-vlan command to cancel the configuration.
By default, no VLAN is protected.
Example
# Set 10, 20 and 30 VLANs to be protected by SecBlade.
[3Com-secblade-newsec] security-vlan 10 20 30