Brocade FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide - Manual (Page 378)

The second STP domain (VLAN 3) requires that half the ports in the domain are dedicated to IP
subnet 10.1.1.0/24 and the other ports are dedicated to IPX network 1. Similar to VLAN 2, Port 9 from
VLAN 3 will be used to carry this IP subnet and IPX network to the FastIron router. No other protocols
will be allowed to enter the network on VLAN 3. Also, no IP packets with a source address on subnet
10.1.1.0/24 or IPX packets with a source address on network 1 will be allowed to enter the switches on
VLAN 3.
There is no need to segment Layer 3 broadcast domains within the STP broadcast domain (VLAN 4).
The FastIron router will dictate the IP subnets and IPX network that are on VLAN 4. There are no
Layer 3 protocol restrictions on VLAN 4; however, the FastIron router is configured to only forward IP
and IPX between STP domains.
FIGURE 83 More protocol-based VLANs
To configure the Layer 3 VLANs on the FSX Layer 2 Switches in the above figure, use the following
procedure.
Configuring Layer 3 VLANs on FSX-A
Enter the following commands to configure FSX-A.
1. Create port-based VLAN 2 and assign the untagged and tagged ports that will participate in this
VLAN.
device-A >en
device-A# config t
device-A(config)# vlan 2 name IP_IPX_Protocol
device-A(config-vlan-2)# untagged e1 to 8
device-A(config-vlan-2)# tagged e25 to 26
2. Enable STP and set the priority to force FSX-A to be the root bridge for VLAN 2.
device-A(config-vlan-2)# spanning-tree
device-A(config-vlan-2)# spanning-tree priority 500
device-A(config-vlan-2)#
Configuring Layer 3 VLANs on FSX-A
378 FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide
53-1003086-04