Specifications

94 ExtremeWare XOS 11.0 Concepts Guide
Virtual LANs
NOTE
All ports added to a specified VMAN must be in the same virtual router. For more information on
displaying, configuring, and using virtual routers, see Chapter 6.
The system adds a 4-byte VMAN header on all packets, both originally tagged and untagged packets
arriving at the VMAN port. When you add ports to the VMAN, the system automatically enables the
specified ports for jumbo frames.
The VMAN tunnel begins at the ingress, or customer access, port and terminates at the egress, or trunk,
port. Traffic flows from the egress trunk port onto the network thereafter without the VMAN tag.
Ensure that all the switch-to-switch ports in the VMAN tunnel are configured as tagged ports.
Configure the VMAN ingress, or customer access, port as an untagged port (although this port does
accept tagged packets). You must configure the VMAN tunnel egress, or trunk, port as an untagged port
so that the VMAN header is stripped from the frame.
NOTE
You must configure the VMAN tunnel egress, or trunk, port as untagged so that the VMAN header is
stripped from the frame.
Each tunnel port that accesses the user can support only one VMAN tunnel; the remaining ports
throughout the VMAN tunnel can support many VMANs.
Configuring VMANs
To configure a VMAN, follow these steps:
1 Create the tunnel by creating the VMAN.
2 Assign a tag value to the VMAN.
3 Add the ports in the tunnel to the VMAN.
4 Configure VMAN member ports as tagged on switch-to-switch ports and untagged on the ingress
and egress ports of the tunnel.
NOTE
You must configure the VMAN tunnel egress, or trunk, port as untagged so that the VMAN header is
stripped from the frame.