From: George Spahl (g.spahl@xxxxxxxxxxxxx)
Date: Thu Jun 13 2002 - 15:33:56 GMT-3
Jeremy,
I don't think it would have any relevance at layer 3 since this is just
used for bridging. Here's a short clip from RFC 1700 where this address
was originally defined. The vendor ID that it sprang from was 0080C2,
the IEEE 802.1 Committee (this is also in RFC 1700).
***********************************
ETHERNET MULTICAST ADDRESSES
An Ethernet multicast address consists of the multicast bit, the
23-bit vendor component, and the 24-bit group identifier assigned by
the vendor. For example, DEC is assigned the vendor component
08-00-2B, so multicast addresses assigned by DEC have the first
24-bits 09-00-2B (since the multicast bit is the low-order bit of the
first byte, which is "the first bit on the wire").
Ethernet Type
Address Field Usage
Multicast Addresses:
01-00-5E-00-00-00- 0800 Internet Multicast [RFC1112]
01-00-5E-7F-FF-FF
01-00-5E-80-00-00- ???? Internet reserved by IANA
01-00-5E-FF-FF-FF
01-80-C2-00-00-00 -802- Spanning tree (for bridges)
09-00-02-04-00-01? 8080? Vitalink printer
09-00-02-04-00-02? 8080? Vitalink management
09-00-09-00-00-01 8005 HP Probe
09-00-09-00-00-01 -802- HP Probe
09-00-09-00-00-04 8005? HP DTC
************************************************************************
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Wright, Jeremy
Sent: Thursday, June 13, 2002 1:17 PM
To: 'ccielab@groupstudy.com'
Subject: STP Multicast
I have read the following:
"The destination MAC address uses the well known STP multicast address
of
01-80-C2-00-00-00".
I assume this is a standard within the STP domain meaning it doesnt
matter
if you are using Cisco equipment or not. Does anyone know if there is an
exact multicast address assigned to that..ie 224.1.1.1 ?
************************
Jeremy Wright
Network Analyst
Archer Daniels Midland
ja_wright@admworld.com
(217)451-4063
************************
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