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Managing Virtual LANs 47
■
Layer 3 address
— On Layer 3 modules, the network or subnetwork
address that is associated with a network-based IP VLAN.
■
Port membership
— The bridge ports that you assign to be part of
the VLAN. If you have created trunks, you must specify the anchor
port (lowest-numbered) port in the trunk when you define the VLAN.
All bridge ports are initially part of the default VLAN on each module.
■
VLAN name
—The name that you assign to the VLAN. It can contain
up to 32 ASCII characters. If the name includes spaces, enclose the
name in quotation marks. The default VLAN uses the name Default.
■
Ingress and egress rules
— Ingress rules determine the VLAN to
which an incoming frame belongs. If it cannot be assigned to any
VLAN, it is assigned to the null VLAN, which contains no ports and has
no associated address table in allClosed mode. Egress rules determine
whether the frame is forwarded, flooded, or filtered, as well as the tag
status of the transmitted frame.
Procedural Guidelines
Follow these procedural guidelines to configure VLANs on the modules in
your system:
1
Use the EME to connect to each Layer 2 and Layer 3 switching module
individually and configure the VLAN mode and VLANs for each module.
2
On each switching module, select the VLAN mode of allOpen or
allClosed.
3
On each switching module, create the appropriate number of VLANs for
your configuration. For each VLAN definition:
a
Select a VID for the VLAN and provide information based on the type
of VLAN: port-based information for Layer 2 modules; port-based,
protocol-based, and network-based information for Layer 3 modules.
b
Include the appropriate front-panel ports. Tag the front-panel ports if
you need to (that is, if the ports overlap with another VLAN and
tagging is the only distinguishing characteristic). Remember that if you
tag a port, the attached device must support IEEE 802.1Q tagging. If
you are configuring a Layer 3 module that serves as a router, your
VLAN may or may not include front-panel ports.
c
Include the backplane port of the switching module in the VLAN
definition unless the VLAN traffic is limited to that switching module
only and will not pass through the switch fabric module. If the
switching module supports two backplane ports (and resides in a slot
that supports two switch fabric module ports), you typically configure