Configuration Guide User guide

770 FastIron Configuration Guide
53-1002494-02
Configuring IP subnet, IPX network and protocol-based VLANs
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.
Figure 81 shows this configuration.
FIGURE 81 Protocol-based (Layer 3) VLANs
FSX
Port 25
Port25
IP-Subnet 1
IP-Subnet 2
IP-Subnet 3
IPX Net 1
Appletalk Cable 100
IP-Subnet 1
IP-Subnet 2
IP-Subnet 3
FESX Layer 3 Switch
Ports 1-16, 25
IPX Net 1
Ports 17-25
Appletalk Cable 100