Nortel business policy switch 2000 User Manual page 73

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
information.
In addition, you configure VLANs as:
• Shared VLAN Learning (SVL) mode—Multiple VLANs use a single
forwarding database.
OR
• Independent VLAN Learning (IVL) mode—Each VLAN uses a unique
forwarding database.
The IVL mode is only an option when using the Business Policy Switch 2000; you
must use the SVL mode when operating a hybrid stack. Business Policy Switches
support up to 64 VLANs (port-, protocol-, or MAC SA-based), including VLAN
#1 which is always port-based. With software version 1.2, the switch supports up
to 256 VLANs. (The maximum number of available MAC SA-based VLANs is
always 48.)
Note: The maximum 256 VLANs is supported only if the Stack
Operational Mode is in Pure BPS 2000 Stack mode. A standalone BPS
2000 also supports a maximum 256 VLANs. (The maximum number of
MAC SA-based VLANs is always 48.)
A mixed stack that consists of BPS 2000 and BayStack 450 switches has
only 64 VLANs.
If you change from a Pure BPS 2000 Stack to a Hybrid Stack, you lose
all VLANs.
Chapter 2, "Network
Using the Business Policy Switch 2000 Version 2.0
configuration," for more
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