Vlan Configuration Guidelines - Cisco WS-C2950SX-48-SI 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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Consider 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
78-15486-01
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.
13.
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide
VLAN Configuration Guidelines
"Configuring Auxiliary VLANs" section on
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Release 8.1
10-5