I diasagree,
I understood that the BPDU has it's own frame format ..the
frame format depends on what type of spanning tree is configured.There is no
concept of a SAP field.
Destination Address
The Destination Address field indicates the destination address as specified
in the Bridge Group Address table. For IEEE Spanning-Tree Protocol BPDU
frames, the address is 0x800143000000. For IBM Spanning-Tree Protocol BPDU
frames, the address is 0xC00000000100. For Cisco Spanning-Tree Protocol BPDU
frames, the address is 0x800778020200.
Source Address
The Source Address field indicates the base MAC address used by the switch.
For Cisco Spanning-Tree Protocol BPDU frames, the multicast bit is set to
indicate the presence of a RIF in the header.
-----Original Message-----
From: Michael Snyder [mailto:[EMAIL PROTECTED]]
Sent: 29 August 2001 04:59
To: [EMAIL PROTECTED]
Subject: Re: BPDUs [7:17607]
Layer two broadcast.
What Sap does it use?
""Christopher Supino"" wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> All ,
>
> I came across this question while studying: How are BPDU's propagated
> amongst switches? Broadcast, multicast, or unicast? Anyone have an
> explanation?
>
> Christopher Supino
> CCNP, CCDP, MCSE, CNA5, ASE
> Senior System Engineer
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=17644&t=17607
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