Panasonic NN46240-502 - Manual (Page 65)

4 VLAN configuration
Nortel Secure Router 8000 Series
Configuration - LAN Access and MAN Access
Step 3 The switch sends frames. The switch sends the frames to the Ethernet network segment
through the outgoing port. You can configure the outgoing port to process the tag. For
example, if the hosts on the network segment where the outgoing port resides cannot identify
the 802.1Q tag, the hosts strip off the tag and then send the frames. If the outgoing port is
connected with other switches, the hosts send the frames directly without changing the tag.
—End
4.1.3 Communication between VLANs
After a LAN is divided into VLANs, the PCs in a VLAN cannot directly communicate on
Layer 2 with the PCs in another VLAN.
To implement communication between VLANs, you must implement IP routing between
VLANs. Generally, Ethernet interfaces of routers (routed Ethernet interface) and Ethernet
interfaces of switches (switched Ethernet interface) are connected to construct a LAN, as
shown in Figure 4-5.
Figure 4-5 Communication between VLANs through routers
Router
VLAN2 VLAN3
In Figure 4-5, the PCs attached to the switch belong to two VLANs (VLAN2 and VLAN3).
To achieve communication between VLAN2 and VLAN3, you must perform the following
tasks:
• On the router, create two subinterfaces on the Ethernet interface, which is connected with
the switch.
• Configure 802.1Q encapsulation and IP addresses on the two subinterfaces.
• Change the type of the Ethernet port on the switch that is connected with the router to
trunk or hybrid and allow frames of VLAN2 and VLAN3 to pass.
For detailed configuration information, see “Example of configuring different VLANs to
communicate through routers.”
4-6 Nortel Networks Inc. Issue 5.3 (30 March 2009)