Understanding Vtp Advertisements; Understanding Vtp Version 2 - Cisco 7604 Configuration Manual
Ios software configuration guide
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Chapter 13
Configuring VTP
Cisco 7600 series routers automatically change from VTP server mode to VTP client mode if the router
Note
detects a failure while writing configuration to NVRAM. If this happens, the router 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 port 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:
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Understanding VTP Version 2
If you use VTP in your network, you must decide whether to use VTP version 1 or version 2.
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If you are using VTP in a Token Ring environment, you must use version 2.
VTP version 2 supports the following features not supported in version 1:
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OL-4266-08
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
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 the
page
14-1.
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 network device
inspects VTP messages for the domain name and version, and forwards a message only if the version
and domain name match. Because 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.
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
Understanding How VTP Works
"Understanding How VLANs Work" section on
13-3
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