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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
Addressing
Usually configured with at least one unique IP
address. You can create a port-based VLAN with-
out an IP address. However, this limits the switch
features available to ports on that VLAN. (Refer to
“How IP Addressing Affects Switch Operation” in
the chapter “Configuring IP Addressing” in the
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 Management and
Configuration Guide for the switch.)
You can configure IP addresses on all protocol
VLANs. However, IP addressing is used only on IPv4
and IPv6 protocol VLANs.
The maximum number of IP addresses supported on
a switch is 256. Each IP address that you configure
on a VLAN interface must be unique in the switch.
For more information, refer to the chapter on
“Configuring IP Addressing” in the Management and
Configuration Guide.
Untagged
VLAN
Membership
A port can be a member of one untagged, port-
based VLAN. All other port-based VLAN
assignments for that port must be tagged.
A port can be an untagged member of one protocol
VLAN of a specific protocol type (such as IPX or IPv6).
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 four different protocol types. This means that a port
can be an untagged member of one of the following:
• Four single-protocol VLANs
• Two protocol VLANs where one VLAN includes a
single protocol and the other includes up to three
protocols
• One protocol VLAN where the VLAN includes four
protocols