At 09:52 AM 3/6/02, Sexton, Ken wrote: >Phil, >The first bit within the Source Address Field is normally the I/G bit, to >define if the source address is individual (unicast) or group (multicast)
A source address can't be a group address. Just a nit-picky comment. >address. In an SRB bridged environment, this one bit is used to indicate if >any Routing Information Field (RIF) information is present in the Token >frame following the SA field. > >This bit will be set by hosts with the SRB environment and used by bridges >to indicate the above. The hosts will keep a "forwarding table" on how to >reach any required destination host. > >If the host doesn't know how to get to a particular destination, it will >send out an explorer frame (all routes explorer -ARE) or a Spanning tree >explorer (SPE) frame to locate the destination. It will depending on your >bridged environment which explorer frame is used. > >The first SRB enabled bridge in the path (from originator to destination) >will see that this is an explorer packet and add its route designator (RD) >information to the RIF. The first bridge will add the first ring number, >it's bridge number, and the ring number of the interface it going to send >the explorer packet out of. > >When all said and done - the host will know how to reach that particular end >host and include RIF information in the token frame. The RII, will tell the >bridge that a RIF is present and forward the frame according to the RIF RC >and RD fields. > >Ken Sexton >Data Network Engineering >ICG Communications >[EMAIL PROTECTED] > > > > >-----Original Message----- >From: Phil Barker [mailto:[EMAIL PROTECTED]] >Sent: Wednesday, March 06, 2002 6:35 AM >To: [EMAIL PROTECTED] >Subject: certificationZone Bridging White paper ! [7:37393] > > >Just been re-reading this paper by David Wolfsener. >See SNIP below. > >In the instance where the RII indicator is a 1 the >frame will be 'source routed' if the frame is 'source >routed' then surely this implies that the RIF must be >manipulated in order to reflect the true Source Route >!!! I havn't got my 'Interconnections' with me so I >cannot confirm. > >Any ideas ? > >Phil. > > >>> SNIP > >Source Route Transparent Bridging (SRT) > >SRT works by analyzing the RII bit to determine if a >RIF is present. If the RII bit is 0, then a RIF is not >present and the frame is transparently bridged. If, >however, the RII bit is 1 and a RIF is present, then >the frame is source routed. Note that SRT bridges do >not add or remove RIFs to frames. By now, you ought to >wonder how to configure SRT. > > >>> END > >__________________________________________________ >Do You Yahoo!? >Everything you'll ever need on one web page >from News and Sport to Email and Music Charts >http://uk.my.yahoo.com ________________________ Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=37464&t=37393 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
