VTP version 2 config

aueddonlineaueddonline Member Posts: 611
Just noticed that in the output of the 'show vtp status' command it says VTP V2 disabled but says VTP version 2,

And then after manually setting 'vtp version 2' it shows VTP V2 enabled, VTP version 2?

So a question, is the difference that when VTP V2 is enabled it will only except version 2 advertisements and diabled is kind of an auto for V1 and 2?
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  • networker050184networker050184 Mod Posts: 11,962 Mod
    VTP V2 is for support of Token Ring. If you are not using Token Ring VLANs then there is no point in enabling it. So you are ok just leaving it disabled.
    An expert is a man who has made all the mistakes which can be made.
  • jmoorsejmoorse Member Posts: 23 ■□□□□□□□□□
    To add:

    "VTP version 2 supports the following features that are not supported in version 1:

    •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 Chapter 11, "Configuring VLANs."

    •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. "

    src: Catalyst 6500 Series Software Configuration Guide, 8.7 - Configuring VTP [Cisco Catalyst 6500 Series Switches] - Cisco Systems

    It is also important to remember that when enabling VTP version 2 all switches participating in the domain must support V2.
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