Brocade FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide - Manual (Page 376)

Configuring IP subnet, IPX network and protocol-based VLANs
Protocol-based VLANs provide the ability to define separate broadcast domains for several unique
Layer 3 protocols within a single Layer 2 broadcast domain. Some applications for this feature might
include security between departments with unique protocol requirements. This feature enables you to
limit the amount of broadcast traffic end-stations, servers, and routers need to accept.
IP subnet, IPX network, and protocol-based VLAN configuration
example
Suppose you want to create five separate Layer 3 broadcast domains within a single Layer 2 STP
broadcast domain:
• Three broadcast domains, one for each of three separate IP subnets
• One for IPX Network 1
• One for the Appletalk protocol
Also suppose you want a single router interface to be present within all of these separate broadcast
domains, without using IEEE 802.1Q VLAN tagging or any proprietary form of VLAN tagging.
The following figure shows this configuration.
FIGURE 82 Protocol-based (Layer 3) VLANs
To configure the VLANs shown in the above figure, use the following procedure.
Configuring IP subnet, IPX network and protocol-based VLANs
376 FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide
53-1003086-04