Subject: [ifmib] RFC 2233 : ifStackTable related clarifications

From: Michael MacFaden <[email-masked]>
Date: Wed, 25 Jul 2001 19:59:20 -0700

At 12:00 PM 7/25/2001 -0400, [email-masked] wrote:
>From: [email-masked]
>To: [email-masked]
>Cc: [email-masked]
>Date: Wed, 25 Jul 2001 15:05:33 +0800
>Subject: [ifmib] RFC 2233 : ifStackTable related clarifications
>
>Hi,
>
>Background :
>Currently, i am exploring for RFC 2233 support to one
>of the device which acts as transperent bridge.  It
>has two ethernet interface and 1 WAN interface.
>So, it can bridge between LAN and LAN or LAN and WAN.
>
>Find below the stacking structure I am currently
>thinking of:
>
>                    IP interface
>            ------------------------
>            |   Virtual-IP interface |
>            -------------------------
>                     |
>  ------------------------------------------
>  |           BRIDGE Forwarding MODULE     |      
>  ------------------------------------------
>      |          |                 |
>    ------    -------          ----------  
>    MAC-P0    MAC-P1            MAC-P2
>    ------    -------          ----------
>     Eth       Eth               AAL5
>                               ----------
>                                 ATM
>                               ----------
>                                ADSL FAst
>                               ----------
>                                ADSL phy
>
>
>Here Virtual-IP(ifType=propVirtual(53)),
>BridgeFwModule
>(ifType=frForward(158)), Mac-P0(ethernetCsmacd=6) to 
>Mac-p2(ifType=ethernetCsmacd=6), AAL5(ifType=aal5),
>ATM(ifType=atm),ADSL fast( ifType=fast)
>and ADSL physical(ifType=adsl) the sub-layers to IP
>interface.  Each of the statistics required by RFC
>2233 will be maintained by each of these interfaces.
>
>Here are my questions:
>
>a. Is my proposed sub-layering and stacking for
>transperent bridge in accordance with RFC 2233?
>Let me know if it requires any changes.
>
>b. Are the ifTypes assigned to each of bridge ports,
>bridge forwarding module and virtual-ip interface OK?

The stacking and ifType assignments look reasonable to me.

>It would be great,if you could point me to some links
>on the web which give stacking examples.

Our implementation notes and ifStackTable usage can
be reviewed from this link:

http://www.nmops.org/download/rs-snmp-mgmt.pdf.zip

See Appendix B (2233 implementation) and D (Understanding
the BRIDGE-MIB).

And this might useful as well:
http://www.nmops.org/download/understanding-snmp-counters.pdf.zip

Regards,
Mike MacFaden

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