From: Sami (sy1977@gmail.com)
Date: Tue Jun 20 2006 - 10:21:01 ART
Petr,
Now I am facing problem with OSPF using VACL. SW1 and SW2 are sending
multicast hello 's to R1 and R3 but they don't receive hello back from R1
and R3, it seems VACL is blocking multicast hello's.
if I remove VACL everything is OK.
Is something special require to forward multicast hello's in VACL ?
Thanks
On 6/20/06, Petr Lapukhov <petr@internetworkexpert.com> wrote:
>
> 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 <http://www.internetworkexpert.com/>
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