Static Virtual LANs (VLANs)
Static VLAN Operation
Static VLAN Operation
A group of networked ports assigned to a VLAN form a broadcast domain that
is separate from other VLANs that may be configured on the switch. On a given
switch, packets are bridged between source and destination ports that belong
to the same VLAN. Thus, all ports passing traffic for a particular subnet
address should be configured to the same VLAN. Cross-domain broadcast
traffic in the switch is eliminated and bandwidth is saved by not allowing
packets to flood out all ports.
Table 2-1. Comparative Operation of Port-Based and Protocol-Based VLANs
Port-Based VLANs Protocol-Based VLANs
IP Usually configured with at least one unique IP
You can configure IP addresses on all protocol
Addressing address. You can create a port-based VLAN with-
VLANs. However, IP addressing is used only on IPv4
out an IP address. However, this limits the switch
and IPv6 protocol VLANs.
features available to ports on that VLAN. (Refer to
“How IP Addressing Affects Switch Operation” in
the chapter on configuring IP addressing in the
Basic Management and Configuration Guide for
the switch.)
You can also use multiple IP addresses to create
multiple subnets within the same VLAN. (For more
on this topic, refer to the chapter on configuring IP
addressing in the Basic Management and
Configuration Guide for the switch.)
Untagged A port can be a member of one untagged, port- A port can be an untagged member of one protocol
VLAN based VLAN. All other port-based VLAN VLAN of a specific protocol type (such as IPX or IPv6).
Membership assignments for that port must be tagged. If the same protocol type is configured in multiple
protocol VLANs, then a port can be an untagged
member of only one of those protocol VLANs. For
example, if you have two protocol VLANs, 100 and
200, and both include IPX, then a port can be an
untagged member of either VLAN 100 or VLAN 200,
but not both VLANs.
A port’s untagged VLAN memberships can include up
to three different protocol types. This means that a
port can be an untagged member of one of the
following:
• Three single-protocol VLANs
• Two protocol VLANs where one VLAN includes a
single protocol and the other includes two
protocols
• One protocol VLAN where the VLAN includes
three protocols
2-6
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