Vlan Configuration Guidelines - Cisco WS-C2948G-GE-TX Configuration Manual

Chapter 10 Configuring VLANs
Table 10-2 VLAN Default Configuration (continued)
Feature
SAID value
Pruning eligibility

VLAN Configuration Guidelines

This section describes the configuration guidelines for creating and modifying VLANs in your network:
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Note the following when creating or modifying extended-range VLANs:
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The Catalyst 4500 series switch 10/100 Ethernet switching modules support auxiliary VLANs in
Note
software release 5.5(1) and later releases. You can plug an externally powered IP phone into a 10/100
port and then add that port to an auxiliary VLAN using the set port auxiliaryvlan command. For
complete details on configuring auxiliary VLANs, see the
page
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Software Configuration Guide—Release 8.2GLX
78-15908-01
Default Value
100,000 plus the VLAN number (for example, the SAID for VLAN 3
is 100,003)
VLANs 2–1000 are pruning eligible; VLANs 1025-4094 are not
pruning eligible
Before you can create a normal-range VLAN, the switch must be in VTP server mode or VTP
transparent mode. If the switch is a VTP server, you must define a VTP domain. For information on
configuring VTP, see Chapter 9, "Configuring VTP."
Since VTP does not work on extended-range VLANs, you can create extended-range VLANs
(1025-4094) even when the VTP mode is set to client.
You can create normal-range VLANs one at a time or you can create a range of VLANs.
You cannot specify a VLAN name when you create a VLAN range, because VLAN names must be
unique.
VLAN numbers are always ISL VLAN identifiers, not 802.1Q VLAN identifiers.
Always specify a VLAN type when configuring the VLAN. By default, the VLAN will be an
Ethernet VLAN.
You can create only extended-range Ethernet VLANs.
You can create and delete only extended-range VLANs from the CLI or SNMP.
You cannot use VTP to manage these VLANs; they must be statically configured on each switch.
You cannot use extended-range VLANs if you have dot1q-to-isl mappings.
You can configure private VLAN parameters and RSPAN for extended-range VLANs; however, all
other parameters for extended-range VLANs use the system defaults only.
10-13.
VLAN Configuration Guidelines
"Configuring Auxiliary VLANs" section on
10-5