Configuration Guide User guide

754 FastIron Configuration Guide
53-1002494-02
VLAN overview
NOTE
IP subnet VLANs are not the same thing as IP protocol VLANs. An IP protocol VLAN sends all IP
broadcasts on the ports within the IP protocol VLAN. An IP subnet VLAN sends only the IP subnet
broadcasts for the subnet of the VLAN. You cannot configure an IP protocol VLAN and an IP subnet
VLAN within the same port-based VLAN.
This note also applies to IPX protocol VLANs and IPX network VLANs, and to AppleTalk protocol VLANs
and AppleTalk cable VLANs.
Default VLAN
By default, all the ports on a FastIron device are in a single port-based VLAN. This VLAN is called
the DEFAULT-VLAN and is VLAN number 1. FastIron devices do not contain any protocol VLANs or IP
subnet, IPX network, or AppleTalk cable VLANs by default.
Figure 75 shows an example of the default Layer 2 port-based VLAN.
FIGURE 75 Default Layer 2 port-based VLAN
DEFAULT-VLAN
VLAN ID = 1
Layer 2 Port-based VLAN
By default, all ports belong to a single
port-based VLAN, DEFAULT-VLAN.
Thus, all ports belong to a single
Layer 2 broadcast domain.