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5.2
VLAN Routing on the Thomson Gateway
Introduction
VLAN bridging does not allow communication between two VLANs: the bridge forwards a frame that belongs
to a specific VLAN only to bridge ports that are member of the same VLAN.
VLAN routing is needed to communicate between two VLANs. To this end, the router on the Thomson
Gateway must be member of both VLANs.
Configuring VLAN routing
To configure WAN-side VLAN tagging, execute following steps:
1
Make the bridge VLAN aware:
=>:eth bridge config vlan=enabled
2
Create the necessary VLAN(s):
=>:eth vlan add name=video vid=2
3
Make the OBC tagged member of the new VLAN(s):
=>:eth bridge vlan ifadd intf=OBC name=video untagged=disabled
4
For each new VLAN, create a
destination and associate the interface with the VID of the correct VLAN:
=>:eth ifadd intf=eth_video
=>:eth ifconfig intf=eth_video dest=bridge vlan=video
=>:eth ifattach intf=eth_video
5
On top of each logical Ethernet interface, create a new IP interface. These IP interfaces are connected to
the router:
=>:ip ifadd intf=ip_video dest=eth_video
=>:ip ifattach intf=ip_video
The resulting configuration of the Thomson Gateway can be used to configure several VLAN
routed scenarios. To this end, some additional steps are necessary: the IP interfaces must be
configured with IP addresses, the necessary routes must be added to the router, and so on.
E-DOC-CTC-20080229-0001 v1.0
5|
Logical Ethernet Interfaces and VLANs
logical Ethernet
interface. Configure this interface with the bridge as
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