3Com 4007, Implementation Manual, Page: 257 / 684

Key Guidelines for Implementation 257
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DECnet counts as one protocol suite for DECnet VLANs.
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The unspecified type of protocol suite counts as one, whether or not
the default VLAN or port-based VLANs are defined. Even if you have
only the unspecified protocol suite on the system, the limit is still 64
VLANs.
■
If you are using GVRP (for dynamic port-based VLANs), use the type
unspecified in the VLAN formula.
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X25, SNA, Banyan VINES, and NetBIOS each count as one protocol
suite for their respective VLANs.
In addition to the limit on the number of VLANs, a limit of 15 different
protocols can be implemented by the protocol suites on the module. See
Table 53 later in this chapter for a list of the supported protocol suites
and the number of protocols within each suite.
The following examples show how to use the equation.
Example 1
You have 7 protocol suites on the Multilayer Switching Module (IP,
AppleTalk, unspecified for the default VLAN, and generic IPX, which
counts as 4 protocol suites):
(125 / 7) minus 3 = 14
In this configuration, the module supports a minimum of 14 VLANs. As
shown in Table 53, these 7 protocol suites use 8 protocols (3 IP,
2 AppleTalk, 1 unspecified, and 2 generic IPX).
Example 2
You have 5 protocol suites: IP, unspecified, AppleTalk, IPX 802.2
Sub-Network Access Protocol (SNAP), and IPX 802.3 Raw:
(125 / 5) minus 3 = 22
In this configuration, the Multilayer Switching Module supports a
minimum of 22 VLANs. As shown in Table 53, these 5 protocol suites use
7 protocols: 3 IP, 1 unspecified, 2 AppleTalk, 1 IPX 802.2 SNAP, and 0 IPX
802.3 Raw (because it does not use an Ethernet protocol type).
If you are upgrading from a Switch 4007 2.x release and the VLAN
resource limit is reached during a power-on with a serial port console
connection, you can use the Administration Console command
bridge vlan vlanAwareMode
to change the VLAN aware mode to
taggedVlanPorts
. See the section “VLAN Aware Mode” next for more
information.