Extreme Networks ExtremeWare XOS 11.3, Manual

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Virtual LANs
ExtremeWare XOS 11.3 Concepts Guide
232
Displaying Protocol Information
To display protocol information, use the following command:
show protocol {<name>}
This
show
command displays protocol information, which includes:
●
Protocol name
●
Type
●
Value
Tunneling (VMANs)
This section discusses how to configure the virtual metropolitan area network (VMAN) feature. The
following topics are covered:
●
Overview on page 232
●
QoS Queue on Egress Port on page 234
●
Guidelines for Configuring VMANs on page 235
●
Configuring VMANs on page 235
●
Displaying VMAN Configurations on page 238
Overview
Beginning with ExtremeWare XOS software version 11.3, you can assign an IP address (including IPv6
addresses) to a specified VMAN. You assign an IP address to a specified VMAN using the following
command (insert the VMAN name, rather than a VLAN name):
configure vlan <vlan_name> ipaddress [<ipaddress> {<ipNetmask>} | ipv6-link-local |
{eui64} <ipv6_address_mask>]
You can “tunnel” any number of 802.1Q and/or Cisco ISL VLANs into a single VLAN that can be
switched through an Extreme Networks Ethernet infrastructure. A given tunnel is completely isolated
from other tunnels or VLANs. For the metropolitan area network (MAN) provider, the tagging numbers
and methods used by the customer are transparent to the provider.
You establish a private path through the public network using the Extreme Networks VMAN feature,
which creates a bidirectional virtual data connection. A given tunnel switches Layer 2 traffic; the
specified tunnel traffic is completely isolated from other traffic or tunnels. This feature is useful in
building transparent private networks, or VMANs, that provide point-to-point or point-to-multipoint
connectivity across an Ethernet infrastructure. Using encapsulation, the routing nodes in the public
network are unaware that the transmission is part of a VMAN connection.
To use the VMAN feature, you configure an encapsulation for all the traffic on the specified VMAN.
The encapsulation allows the VMAN traffic to be switched over an Layer 2 infrastructure. To
encapsulate the packet, the system adds a VMAN header that forms an outer VLAN header to the
Ethernet frame. The traffic is switched through the infrastructure based on the VMAN header. The
egress port of the entire VMAN removes the VMAN header, and the frame proceeds through the rest of
the network with the original VLAN header.