17-3
Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
Chapter 17 Configuring VLANs, VTP, and VMPS
VLANs
•
VLAN number to use when translating from one VLAN type to another
Note
When the software translates from one VLAN type to another, it requires a different VLAN number for
each media type.
VLAN Configuration Guidelines and Restrictions
Follow these guidelines and restrictions when creating and modifying VLANs in your network:
•
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
“VLAN Trunking Protocol” section on page 17-7
•
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
VLAN Ranges
Note
You must enable the extended system ID to use 4094 VLANs. See the
With Cisco IOS Release 12.2(31)SGA 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.
describes the uses for VLAN ranges.
Table 17-1
VLAN Ranges
VLANs
Range
Usage
Propagated
by VTP
0, 4095
Reserved
For system use only. You cannot see or use these VLANs.
—
1
Normal
Cisco default. You cannot delete this VLAN.
Yes
2–1001
Normal
Used for Ethernet VLANs; you can create, use, and delete
these VLANs.
Yes
Summary of Contents for Catalyst 4500 Series
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