IronPort Systems 4108GL - Manual (Page 316)

14-10
Port-Based Virtual LANs (VLANs) and GVRP
Port-Based Virtual LANs (Static VLANs)
Po
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-Ba
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ir
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LANs
(VLAN
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RP
General Steps for Using VLANs
1. Plan your VLAN strategy and create a map of the logical topology that will
result from configuring VLANs. Include consideration for the interaction
between VLANs and other features such as Spanning Tree Protocol, load
balancing, and IGMP. (Refer to “Effect of VLANs on Other Switch Fea-
tures” on page 14-27.) If you plan on using dynamic VLANs, include the
port configuration planning necesary to support this feature. (See “GVRP”
on page 14-30.)
By default, VLAN support is enabled and the switch is configured for eight
VLANs.
2. Configure at least one VLAN in addition to the default VLAN.
3. Assign the desired switch ports to the new VLAN(s).
4. If you are managing VLANs with SNMP in an IP network, each VLAN must
have an IP address. Refer to “IP Configuration” on “IP Configuration” on
page 7-3.
Notes on Using VLANs
■ If you are using DHCP/Bootp to acquire the switch’s configuration, packet
time-to-live, and TimeP information, you must designate the VLAN on
which DHCP is configured for this purpose as the primary VLAN. (In the
factory-default configuration, the DEFAULT_VLAN is the primary VLAN.)
■ IGMP, and some other features operate on a “per VLAN” basis. This means
you must configure such features separately for each VLAN in which you
want them to operate.
■ You can rename the default VLAN, but you cannot change its VID (1) or
delete it from the switch.
■ Any ports not specifically assigned to another VLAN will remain assigned
to the DEFAULT_VLAN.
■ To delete a VLAN from the switch, you must first remove from that VLAN
any ports assigned to it.
■ Changing the number of VLANs supported on the switch requires a reboot.
Other VLAN configuration changes are dynamic.