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- From: craven@egr.msu.edu (Dean Craven)
- Newsgroups: comp.dcom.lans.misc,comp.dcom.lans.ethernet
- Subject: 802.5 transparent briding question
- Message-ID: <1992Aug18.141851.22311@msuinfo.cl.msu.edu>
- Date: 18 Aug 92 14:18:51 GMT
- Sender: news@msuinfo.cl.msu.edu
- Organization: Michigan State University, College of Engineering
- Lines: 25
- Originator: craven@eecae.ee.msu.edu
-
- Hi,
-
- Here is a question for folks with 802.5 briging experience. If there is
- a better newsgroup for this area, please let me know.
-
- What are the options for setting the A and C bits of the Frame Status byte
- when doing transparent bridging on 802.5 LANs? IEEE 802.1d defines both
- MAC and MAC relay software entities. If I'm reading 802.1d correctly, the
- MAC level in a bridge is allowed to set the A and C bits to 1 whenever it
- receives a user_data_frame to be given from the MAC entity to the MAC
- relay entity (i.e., the A and C bits are set before the MAC relay entity
- checks the filtering database to decide whether to really forward the
- frame - thus the bridge sets the A and C bits for all user frames on the
- source ring).
-
- Am I reading 802.1d correctly? Are bridge developers setting the A and C
- bits for all user frames? What are the ramifications of setting these
- bits for other nodes on the LAN? Alternatively, what are the ramifications
- of not setting the A and C bits when forwarding a frame?
-
- Please respond via email. Thanks.
-
- Dean Craven (craven@egr.msu.edu)
- Software Engineer
- Dale Computer Corp.
-