Understanding Vtp Version; Understanding Vtp Pruning - Cisco WS-X6066-SLB-APC - Content Switching Module Software Manual

Chapter 10 Configuring VTP
•
•
•
•

Understanding VTP Version 2

If you use VTP in your network, you must decide whether to use VTP version 1 or version 2.
If you are using VTP in a Token Ring environment, you must use version 2.
Note
VTP version 2 supports the following features not supported in version 1:
•
•
•
•

Understanding VTP Pruning

VTP pruning enhances network bandwidth use by reducing unnecessary flooded traffic, such as
broadcast, multicast, unknown, and flooded unicast packets. VTP pruning increases available bandwidth
by restricting flooded traffic to those trunk links that the traffic must use to access the appropriate
network devices. By default, VTP pruning is disabled.
Make sure that all devices in the management domain support VTP pruning before enabling it. VTP
pruning is supported in supervisor engine software release 5.1(1) and later releases.
If you are using routers to route between emulated LANS, you should disable VTP pruning in the VTP
Note
management domain that contains the switches with ATM LANE modules installed (VTP pruning
messages are sent over the ATM LANE module because it is a trunk). Another solution is to disable
pruning for the LANE VLANs using the clear vtp pruneeligible command on all switches with ATM
LANE modules.
78-13315-02
VTP domain name
VTP configuration revision number
VLAN configuration, including the maximum transmission unit (MTU) size for each VLAN
Frame format
Token Ring support—VTP version 2 supports Token Ring LAN switching and VLANs (Token Ring
Bridge Relay Function [TrBRF] and Token Ring Concentrator Relay Function [TrCRF]). For more
information about Token Ring VLANs, see
Unrecognized Type-Length-Value (TLV) Support—A VTP server or client propagates configuration
changes to its other trunks, even for TLVs it is not able to parse. The unrecognized TLV is saved in
NVRAM.
Version-Dependent Transparent Mode—In VTP version 1, a VTP transparent switch inspects VTP
messages for the domain name and version and forwards a message only if the version and domain
name match. Since only one domain is supported in the supervisor engine software, VTP version 2
forwards VTP messages in transparent mode, without checking the version.
Consistency Checks—In VTP version 2, VLAN consistency checks (such as VLAN names and
values) are performed only when you enter new information through the CLI or SNMP. Consistency
checks are not performed when new information is obtained from a VTP message, or when
information is read from NVRAM. If the digest on a received VTP message is correct, its
information is accepted without consistency checks.
Chapter 11, "Configuring VLANs."
Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
Understanding How VTP Works
10-3