Vlan Configuration Guidelines And Restrictions - Cisco Catalyst 4500 Series Configuration Manual

Chapter 15 Configuring VLANs, VTP, and VMPS
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When the software translates from one VLAN type to another, it requires a different VLAN number for
Note
each media type.

VLAN Configuration Guidelines and Restrictions

Follow these guidelines and restrictions when creating and modifying VLANs in your network:
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VLAN Ranges
Note You must enable the extended system ID to use 4094 VLANs. See the
section on page
With Cisco IOS Release 12.2(25)EWA 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.
OL-25340-01
VLAN state (active or suspended)
Maximum transmission unit (MTU) for the VLAN
Security Association Identifier (SAID)
VLAN number to use when translating from one VLAN type to another
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
You cannot use the end command in VLAN database mode.
You cannot use Ctrl-Z to exit VLAN database mode.
If a Catalyst 4948 switch running MSTP and configured with all possible VLANs (4094) is in the
path of two HSRP peers with the timeout set below 500 ms, HSRP flaps.
Workarounds:
– Use fewer VLANs.
– Set the timers greater than 600 ms.
– Enter the no igmp snooping (globally) and access-list hardware capture mode VLAN
commands
20-2.
"VLAN Trunking Protocol" section on page
Software Configuration Guide—Release IOS XE 3.3.0SG and IOS 15.1(1)SG
VLANs
15-7.
"Understanding the Bridge ID"
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