Cisco Catalyst 4500 Series Administration Guide

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Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)E
OL_28731-01
Chapter 16 Configuring VLANs, VTP, and VMPS
VLAN Trunking Protocol
Understanding VTP Modes
You can configure a Catalyst 4500 series switch to operate in any one of these VTP modes:
• Server—In VTP server mode, you can create, modify, and delete VLANs and specify other
configuration parameters (such as VTP version and VTP pruning) for the entire VTP domain. VTP
servers advertise their VLAN configuration to other network devices in the same VTP domain and
synchronize their VLAN configuration with other network devices based on advertisements received
over trunk links. VTP server is the default mode.
Note In VTP version 3, manipulation of VLANs can be done only to primary servers.
• Client—VTP clients behave the same way as VTP servers, but you cannot create, change, or delete
VLANs on a VTP client.
• Transparent—VTP transparent network devices do not participate in VTP. A VTP transparent
network device does not advertise its VLAN configuration and does not synchronize its VLAN
configuration based on received advertisements. However, in VTP version 2, transparent network
devices do forward VTP advertisements that they receive on their trunking LAN interfaces.
• Off—In VTP off mode, a network device functions in the same manner as a VTP transparent device
except that it does not forward VTP advertisements.
Note Catalyst 4500 series switches automatically change from VTP server mode to VTP client mode if the
switch detects a failure while writing configuration to NVRAM. If this happens, the switch cannot be
returned to VTP server mode until the NVRAM is functioning.
Understanding VTP Advertisements
Each network device in the VTP domain sends periodic advertisements out each trunking LAN interface
to a reserved multicast address. VTP advertisements are received by neighboring network devices, which
update their VTP and VLAN configurations as necessary.
The following global configuration information is distributed in VTP advertisements:
• VLAN IDs (ISL and 802.1Q)
• Emulated LAN names (for ATM LANE)
• 802.10 SAID values (FDDI)
• VTP domain name
• VTP configuration revision number
• VLAN configuration, including maximum transmission unit (MTU) size for each VLAN
• Frame format
Understanding VTP Versions
VTP Version 2
If you use VTP in your network, you must decide whether to use VTP version 2 or version 3.

Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E