Brocade Multi-Service IronWare Switching Configuration Guide (Supporting R05.6.00) - Manual (Page 206)

176 Multi-Service IronWare Switching Configuration Guide
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VLAN groups
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There is a separate STP domain for each port-based VLAN. Routing occurs independently across
port-based VLANs or STP domains. You can define each end of each backbone link as a separate
tagged port-based VLAN. Routing will occur independently across the port-based VLANs. Because
each port-based VLAN’s STP domain is a single point-to-point backbone connection, you are
guaranteed to never have an STP loop. STP will never block the virtual router interfaces within the
tagged port-based VLAN, and you will have a fully routed backbone.
A Brocade device offers the ability to create a virtual routing interface within a Layer 2 STP
port-based VLAN or within each IP protocol VLAN. This combination of multiple Layer 2 or Layer 3
broadcast domains and virtual routing interfaces are the basis for the very powerful Integrated
Switch Routing (ISR) technology. ISR is very flexible and can solve many networking problems.
FIGURE 10 Example of two separate backbones for the same protocol
The following is a sample configuration for the illustration above.
Brocade(config)# vlan 2
Brocade(config-vlan-2)# tagged e 1/1 to 1/2
Brocade(config-vlan-2)# router-inter ve 2
Brocade(config-vlan-2)# exit
Brocade(config)# vlan 3
Brocade(config-vlan-3)# tagged e 1/13 to 1/24
Brocade(config-vlan-3)# router-int ve 3
Brocade(config-vlan-3)# exit
Brocade(config)# interface ve 2
Brocade(config-ve-2)# ip address 10.1.1.1/24
Brocade(config-if-e1000-2/1)# exit
Brocade(config)# interface ve 3
Brocade(config-ve-3)# ip address 10.2.1.1/24
IP packets are bridged (switched) within the same protocol VLAN if they are on the same subnet;
they are routed if they are on a different VLAN.
VLAN groups
To simplify VLAN configuration when you have many VLANs with the same configuration, you can
configure VLAN groups. When you create a VLAN group, the VLAN parameters you configure for the
group apply to all the VLANs within the group.