Configuring Virtual LANs (VLANs)
December 2005
© Foundry Networks, Inc.
11 - 3
NOTE:
VLAN ID 4094 is reserved for use by Single STP. VLAN IDs 4091 and 4092 are reserved for use in the
Layer 3 Switch and Base Layer 3 images. You can configure these VLAN IDs in the Layer 2 Switch image.
Each port-based VLAN can contain either tagged or untagged ports. A port cannot be a member of more than
one port-based VLAN unless the port is tagged.
802.1Q tagging
allows the port to add a four-byte tag field, which
contains the VLAN ID, to each packet sent on the port. You also can configure port-based VLANs that span
multiple devices by tagging the ports within the VLAN. The tag enables each device that receives the packet to
determine the VLAN the packet belongs to. 802.1Q tagging applies only to Layer 2 VLANs, not to Layer 3 VLANs.
Since each port-based VLAN is a separate Layer 2 broadcast domain, by default each VLAN runs a separate
instance of the Spanning Tree Protocol (STP).
Layer 2 traffic is bridged within a port-based VLAN and Layer 2 broadcasts are sent to all the ports within the
VLAN.
Figure 11.1 shows an example of a Foundry device on which a Layer 2 port-based VLAN has been configured.
Figure 11.1
Foundry device containing user-defined Layer 2 port-based VLAN
Layer 3 Protocol-Based VLANs
If you want some or all of the ports within a port-based VLAN to be organized according to Layer 3 protocol, you
must configure a Layer 3 protocol-based VLAN within the port-based VLAN.
You can configure each of the following types of protocol-based VLAN within a port-based VLAN. All the ports in
the Layer 3 VLAN must be in the same Layer 2 VLAN.
User-configured port-based VLAN
When you add a port-based VLAN,
the device removes all the ports in the
new VLAN from DEFAULT-VLAN.
DEFAULT-VLAN
VLAN ID = 1
Layer 2 Port-based VLAN
Содержание FastIron Edge Switch X424
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