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Intel
®
NetStructure™ 480T Routing Switch User Guide
You can tunnel any number of 802.1Q VLANs into a single VLAN
that can be switched through the 480T routing switch Ethernet
infrastructure.
Each tunnel is completely isolated from other tunnels or VLANs.
This feature is useful in building transparent private networks (also
called virtual metropolitan area networks or vMANs) that need
point-to-point or point-to-multipoint connectivity across an
Ethernet infrastructure.
The VLAN tagging methods used within the vMAN tunnel are
transparent to the tunnel. The tagging numbers and methods used by
the customer are transparent to the metropolitan area network
(MAN) provider.
To configure a vMAN tunnel:
1. Modify the 802.1Q Ethertype used by the switch to recognize
tagged frames.
2. Configure the switch to accept larger MTU (maximum
transmission unit)
size frames (jumbo frames).
3. Create tunnels by creating VLANs and configuring member ports
as
tagged on switch-to-switch ports and untagged on the tunnel’s
ingress/egress ports.