Nortel business policy switch 2000, User Manual

Page: 73 / 412

73
Using the Business Policy Switch 2000 Version 2.0
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.
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.