FW: [802.1] MSTP MIB - mstpMapTable

["David B Harrington" <dbharrington@comcast.net>]

Hi,

I sent this comment to the 802.1WG as well.

dbh

-----Original Message-----
From: IEEE 802.1 [mailto:hdk-0119.ckxbsg@att.net] On Behalf Of David B
Harrington
Sent: Tuesday, September 06, 2005 10:17 AM
To: STDS-802-1-L@listserv.ieee.org
Subject: Re: [802.1] MSTP MIB - mstpMapTable

Hi,

Let me provide a little further interpretation.

Because support of messages greater than 484 octets is not required,
if you define an object that requires a message larger than 484
octets, some standards-compliant SNMP applications may not be able to
retrieve your object, and some standards-compliant SNMP agent
implementations may not be able to send your object.

To ensure interoperability (and interoperability is why we define
standards), it would be wise to limit the size of this object so that
it can fit within a 484 octet message, so all standards-compliant SNMP
implementations would be able to work with the MIB module. 

David Harrington
dbharrington@comcast.net
IETF MIB Doctor
 

> -----Original Message-----
> From: IEEE 802.1 [mailto:hdk-0119.ckxbsg@att.net] On Behalf 
> Of Keith McCloghrie
> Sent: Tuesday, September 06, 2005 8:45 AM
> To: STDS-802-1-L@listserv.ieee.org
> Subject: Re: [802.1] MSTP MIB - mstpMapTable
> 
> > 1. Divide one long OCTET STRING into 4 shorter
> >     OCTET STRING. I don't see the reason for it.
> 
> The reason is the difference between "must" and "recommended".
> Specifically, all the transport mappings in RFC 3417 say the
> equivalent of:
> 
>    When an SNMP entity uses this transport mapping, it must be
capable
>    of accepting messages up to and including 484 octets in 
> size.  It is
>    recommended that implementations be capable of accepting 
> messages of
>    up to 1472 octets in size.  Implementation of larger values is
>    encouraged whenever possible.
> 
> Keith.
> 
> IEEE 802.1 list:
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