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Conference netcad::hub_mgnt

Title:	DEChub/HUBwatch/PROBEwatch CONFERENCE
Notice:	Firmware -2, Doc -3, Power -4, HW kits -5, firm load -6&7
Moderator:	NETCAD::COLELLADT

Created:	Wed Nov 13 1991
Last Modified:	Fri Jun 06 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	4455
Total number of notes:	16761

3445.0. "NetBEUI filtering, DECbridge 90" by LEMAN::PAIVA (Hawkeye - Network Support @GEO) Fri Apr 12 1996 08:05

    Hi!
    
      We're trying to find out if it is possible to filter the NetBEUI protocol
    on a DECbridge 90. The following problem arises:
      We think that we should be filtering on a DSAP value of F0 and SSAP
    values of F0 and F1 according with the frames contents we saw with
    IRIS. However, the filters available on a DECbridge 90 are either for
    Ethernet V2 frames protocol types or for IEEE802.3/802.2 frames with a 
    proprietary frame format (5 bytes).
      Is there a solution to achieve our goal (customer one, of course) or
    are we in a no-go situation. How can this be achieved with say a
    DECswitch 900EF? I had a look at the possible filters but saw nothing
    except 08-00-2B-80-40 for the NetBIOS encapsulation.
    
      Thanks.
    
      Cheers,
    
      Pedro PAIVA

T.R	Title	User	Personal Name	Date	Lines
3445.1		NPSS::WADE	Network Systems Support	`Fri Apr 12 1996 11:10`	29
	The DECbridge 90 allows you to create protocol filters based on Ethernet V2 2-byte protocol identifiers or the IEEE 802.3 5-byte SNAP SAP protocol identifier. There is no support for filtering based on IEEE 802.3 DSAP protocol identifiers. The SNAP SAP protocol filtering code checks for a match on DSAP == AA (SNAP SAP) and does not further processing on the packet if it does not match. All other DSAP protocol identifiers pass through this section of code. From the features section of the SPD for DECbridge 90 V3.9 - - Set up to 16 protocol filters, which may be set as either Ethernet protocol types (two bytes) or IEEE 802.3 SNAP SAP protocol identifiers (five bytes). Each of these 16 filters can have one of five dispositions. (The first two dispositions are mutually exclusive, and cannot be used simultaneously on the same bridge.) There has been some confusion on this so plans are to add the following test to the SPD - The default handling of IEEE 802.3 DSAP protocol identifiers (other than the SNAP SAP of 'AA') is to always forward. This behavior is not altered by the setting of IEEE 802.3 SNAP SAP protocol or Ethernet V2 protocol filters. Bill
3445.2	1 remaining question	BACHUS::KNEUTS	Erwin Kneuts DTN 856-8726	`Mon Apr 15 1996 05:44`	19
	It can't be done with the bridge 90. thanks for the clear answer. Remains the question: Can it be done with the 900-EF? The installation manual, and the product description say it has "full function protocol filtering capabilities". Unfortunately I do not have a 900-EF to find out how full these capabilities are. I am pretty sure a Chipcom 5102 can not do the job. Not sure about Chipcom 5106. Chipcom would be an expesive alternative for customers not having Chipcom yet. For those interested: We are selling the Proteon bridge/router for Token Ring / Ethernet connectivity. This one seems to have netbios filtering (according to product description) Anybody out there can share his/here experience? Erwin
3445.3		NPSS::WADE	Network Systems Support	`Tue Apr 16 1996 10:22`	8
	The DEFBA supports protocol filtering based on - 2-byte Etherent protocol id 1-byte DSAP protocol id 5-byte SNAP protocol id Bill
3445.4	and the DEBMP (DECswitch 900EE)?	MKOTS3::LEVY_J		`Thu May 23 1996 15:27`	7
	What about the DEBMP (DECswitch 900EE)? Does it support protocol filtering based on: 2-byte Etherent protocol id 1-byte DSAP protocol id 5-byte SNAP protocol id
3445.5		SLINK::HOOD	Your bad news bear	`Thu May 23 1996 16:13`	7
	Yes. DECbridge 900MX DECswitch 900EE DECswitch 900EF PEswitch 900TX and the fibre variant of the DECswitch 900 all filter exactly the same way.