Configuration Guide User guide

752 FastIron Configuration Guide
53-1002494-02
VLAN overview
FIGURE 74 Layer 3 protocol VLANs within a Layer 2 port-based VLAN
Integrated Switch Routing (ISR)
The Brocade Integrated Switch Routing (ISR) feature enables VLANs configured on Layer 3
switches to route Layer 3 traffic from one protocol VLAN or IP subnet, IPX network, or AppleTalk
cable VLAN to another. Normally, to route traffic from one IP subnet, IPX network, or AppleTalk
cable VLAN to another, you would need to forward the traffic to an external router. The VLANs
provide Layer 3 broadcast domains for these protocols but do not in themselves provide routing
services for these protocols. This is true even if the source and destination IP subnets, IPX
networks, or AppleTalk cable ranges are on the same device.
DEFAULT-VLAN
VLAN ID = 1
Layer 2 Port-based VLAN
User-configured port-based VLAN
User-configured protocol VLAN, IP sub-net VLAN,
IPX network VLAN, or Apple Talk cable VLAN
You can add Layer 3 protocol VLANs or
IP sub-net, IPX network, and AppleTalk
cable VLANs to port-based VLANs.
Layer 3 VLANs cannot span Layer 2 port-based
VLANs.
However, Layer 3 VLANs can overlap within
a Layer 2 port-based VLAN.