Nortel 2000, Using Manual

Page: 64 / 405

64
Using the Business Policy Switch 2000 Version 1.2
In software version 1.1, automatic PVID automatically sets the PVID when
you configure a port-based VLAN. The PVID value will be the same value as
VLAN. The user can also manually change the PVID value.
The default setting for AutoPVID is Off; you must enable this feature.
• Protocol-based VLANs
A protocol-based VLAN is a VLAN in which you assign your switch ports as
members of a broadcast domain, based on the protocol information within the
packet. Protocol-based VLANs can localize broadcast traffic and assure that
only the protocol-based VLAN ports are flooded with the specified protocol
type packets. The maximum number of available protocols is 14.
• MAC source address (SA)-based VLANs
A MAC SA-based VLAN is a VLAN in which you assign switch ports as
members of a broadcast domain, based on the source MAC address
information within the packet. MAC SA-based VLANs can be used to
provide a MAC-level security scheme to organize and group different users.
The maximum number of available MAC SA-based VLANs is 48.
Policy-based VLANs are determined by the information within the packet. A port
can be a member of multiple policy-based VLANs. The order in which the rules
for VLAN classification are applied are:
1
Is the packet tagged?
2
Does the packet belong in a MAC SA-based VLAN?
3 Does the packet belong in a protocol-based VLAN?
If none of the criteria applies, the packet belongs in the VLAN identified by the
PVID of the ingress port. See
Chapter 2, “Network configuration ,” for more
information.
In addition, you configure VLANs as:
• Shared VLAN Learning (SVL) mode—Multiple VLANs use a single
forwarding database.