Vlan Configuration Guidelines And Restrictions; Vlan Ranges - Cisco 4500M Software Manual

Chapter 10 Understanding and Configuring VLANs

VLAN Configuration Guidelines and Restrictions

Follow these guidelines and restrictions when creating and modifying VLANs in your network:
•
•
•

VLAN Ranges

You must enable the extended system ID to use 4094 VLANs. See the
Note
section on page
With Cisco IOS Release 12.2(25)EW and later, Catalyst 4500 series switches support 4096 VLANs in
compliance with the IEEE 802.1Q standard. These VLANs are organized into three ranges: reserved,
normal, and extended.
Some of these VLANs are propagated to other switches in the network when you use the VLAN
Trunking Protocol (VTP). The extended-range VLANs are not propagated, so you must configure
extended-range VLANs manually on each network device.
Table 10-1
Table 10-1 VLAN Ranges
VLANs Range
0, 4095 Reserved
1 Normal
2–1001 Normal
1002–1005 Normal
1006–4094 Extended
OL-6696-01
Before creating a VLAN, put the Catalyst 4500 series switch in VTP server mode or VTP
transparent mode. If the Catalyst 4500 series switch is a VTP server, you must define a VTP domain.
For information on configuring VTP, see
The Cisco IOS end command is not supported in VLAN database mode.
You cannot use Ctrl-Z to exit VLAN database mode.
14-2.
describes the uses for VLAN ranges.
Usage
For system use only. You cannot see or use these VLANs.
Cisco default. You can use this VLAN but you cannot delete it.
Used for Ethernet VLANs; you can create, use, and delete these VLANs.
Cisco defaults for FDDI and Token Ring. You cannot delete VLANs 1002–1005.
For Ethernet VLANs only. When configuring extended-range VLANs, note the
following:
• Layer 3 ports and some software features require internal VLANs. Internal
VLANs are allocated from 1006 and up. You cannot use a VLAN that has been
allocated for such use. To display the VLANs used internally, enter the show
vlan internal usage command.
Switches running Catalyst product family software do not support
•
configuration of VLANs 1006–1024. If you configure VLANs 1006–1024,
ensure that the VLANs do not extend to any switches running Catalyst product
family software.
You must enable the extended system ID to use extended range VLANs. See
•
the "Enabling the Extended System ID" section on page
VLAN Configuration Guidelines and Restrictions
Chapter 27, "Understanding and Configuring VTP."
"Understanding the Bridge ID"
14-8.
Software Configuration Guide—Release 12.2(25)EW
Propagated
by VTP
N/A
Yes
Yes
Yes
No
10-3