Re: VACL

From: Petr Lapukhov (petr@internetworkexpert.com)
Date: Tue Jun 20 2006 - 08:45:42 ART

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So, finally:

<DocCD>
*
PVST+* is a Cisco proprietary protocol that creates one STP instance per
VLAN (as in PVST). However, PVST+ enhances PVST and uses Cisco proprietary
BPDUs with a special 802.2 SNAP OUI instead of the standard IEEE
802.1Dframe format used by PVST

PVST+ BPDUs are also known as SSTP (Shared Spanning Tree Protocol) BPDUs.

</DocCD>

Now, to permit PVST+ we need to allow SNAP frames :)

To support the quotation here is a debuging output:

Rack1SW2#debug spanning-tree bpdu receive
Spanning Tree BPDU Received debugging is on
Rack1SW2#
00:12:12: STP: VLAN0004 rx BPDU: config protocol = ieee, packet from
FastEthernet0/13 , linktype SSTP , enctype 3, encsize 22
00:12:12: STP: enc 01 00 0C CC CC CD 00 0F 8F E0 35 0D 00 32 AA AA 03 00 00
0C 01 0B
00:12:12: STP: Data
00000000006004000F8FE03500000000006004000F8FE03500800D0000140002000F00
00:12:12: STP: VLAN0004 Fa0/13:0000 00 00 00 6004000F8FE03500 00000000
6004000F8FE03500 800D 0000 1400 0200 0F00
00:12:12: STP(4) port Fa0/13 supersedes 0

-- Petr Lapukhov, CCIE #16379 petr@internetworkexpert.com

Internetwork Expert, Inc. http://www.InternetworkExpert.com Toll Free: 877-224-8987 Outside US: 775-826-4344

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