From: Henk de Tombe (henk.de.tombe@qi.nl)
Date: Sun Feb 05 2006 - 08:03:31 GMT-3
Hi,
Are you sure that ethertype 0x8100 matches 802.1q bpdu's, or do they match
something else?
Take a look at the output of the trace below:
Frame 861 (60 bytes on wire, 60 bytes captured)
Time delta from previous packet: 4.276125000 seconds
Time since reference or first frame: 4.276125000 seconds
Frame Number: 861
Packet Length: 60 bytes
Capture Length: 60 bytes
IEEE 802.3 Ethernet
Destination: 01:80:c2:00:00:21 (01:80:c2:00:00:21)
Source: 00:01:30:01:01:01 (ExtremeN_01:01:01)
Length: 10
Trailer: 00111411001E00010401001400000038...
Logical-Link Control
DSAP: Spanning Tree BPDU (0x42)
IG Bit: Individual
SSAP: Spanning Tree BPDU (0x42)
CR Bit: Command
You can take a look at this post where someone was trying to filter BPDU
frames:
http://www.groupstudy.com/archives/ccielab/200403/msg00329.html
Regards,
Henk
-----Oorspronkelijk bericht-----
Van: nobody@groupstudy.com [mailto:nobody@groupstudy.com] Namens CCIEin2006
Verzonden: zondag 5 februari 2006 01:05
Aan: ccie lab
Onderwerp: mac access-list is denying 802.1q BPDU's on 3550 switch
Hello Group,
I am trying to create a mac access-list entry that will allow 802.1q BPDU's.
I tried adding the following entry:
permit any any 0x8100 0x0
However bpdu's are still being blocked causing spanning tree loops.
Can someone tell me if I'm using the proper ethertype or possible am not
permitting it correctly?
Thanks
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