Re: [Idr] BGP MIB v2 input
Jeffrey Haas <jhaas@pfrc.org> Mon, 26 March 2007 13:33 UTC
Return-path: <idr-bounces@ietf.org>
Received: from [127.0.0.1] (helo=stiedprmman1.va.neustar.com) by megatron.ietf.org with esmtp (Exim 4.43) id 1HVpJz-0002po-5y; Mon, 26 Mar 2007 09:33:15 -0400
Received: from [10.91.34.44] (helo=ietf-mx.ietf.org) by megatron.ietf.org with esmtp (Exim 4.43) id 1HVpJy-0002l2-0Q for idr@ietf.org; Mon, 26 Mar 2007 09:33:14 -0400
Received: from manos.scc.mi.org ([204.11.140.250]) by ietf-mx.ietf.org with esmtp (Exim 4.43) id 1HVpJv-0006g0-OP for idr@ietf.org; Mon, 26 Mar 2007 09:33:13 -0400
Received: by manos.scc.mi.org (Postfix, from userid 1025) id 027FE4E4AA; Mon, 26 Mar 2007 09:32:51 -0400 (EDT)
Date: Mon, 26 Mar 2007 09:32:50 -0400
From: Jeffrey Haas <jhaas@pfrc.org>
To: Bill Fenner <fenner@research.att.com>
Subject: Re: [Idr] BGP MIB v2 input
Message-ID: <20070326133250.GB8422@scc.mi.org>
References: <6F44D7F6B24A8F4DA0AB46C9BE924F0209F07D6F@VS4.EXCHPROD.USA.NET> <17921.18878.834053.856771@limmat.switch.ch> <200703260450.l2Q4obpc001219@bright.research.att.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Disposition: inline
In-Reply-To: <200703260450.l2Q4obpc001219@bright.research.att.com>
User-Agent: Mutt/1.5.9i
X-Spam-Score: 0.0 (/)
X-Scan-Signature: 4b800b1eab964a31702fa68f1ff0e955
Cc: idr@ietf.org
X-BeenThere: idr@ietf.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Inter-Domain Routing <idr.ietf.org>
List-Unsubscribe: <https://www1.ietf.org/mailman/listinfo/idr>, <mailto:idr-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www1.ietf.org/pipermail/idr>
List-Post: <mailto:idr@ietf.org>
List-Help: <mailto:idr-request@ietf.org?subject=help>
List-Subscribe: <https://www1.ietf.org/mailman/listinfo/idr>, <mailto:idr-request@ietf.org?subject=subscribe>
Errors-To: idr-bounces@ietf.org
On Mon, Mar 26, 2007 at 06:50:37AM +0100, Bill Fenner wrote: > It may be worth breaking this down into areas of limitation of the > current MIB: > > 1. v6 peer support > 2. v6 and other NLRI support > 3. 4-byte AS support > 4. extra counters desired > (Others?) > > #1 can be taken care of with a rev of the peer table using > the InetAddressType/InetAddress TCs. > > For #2, I have a somewhat radical proposal, which is to eliminate > the reporting of the BGP table contents via SNMP. The radical > replacement would be a "lookup request" which you do by writing > an AFI, SAFI, NLRI to a lookup table, specifying whether you want > longest match or all matches, and you read the results from a > lookup results table. > > (a few reasons for this change: > a) It's not very efficient to have an SNMP table with 200k+ rows; > b) It's hard to represent, e.g., VPN routes; and > c) You probably want to know "what routes do you know for > this destination", which is not easy to answer even with the > existing indexing, since "destination" is probably a /32 and > the prefix in the table is probably not) #2 is an intriguing idea. Existing UI implementations already cover having multiple "processes" access the routing table simultaneously. However, I think this may have some interesting implementation headaches. Could you please comment on them? - This would require set/write access to the MIB, correct? If so, that's one of the things that people expressed serious reservations about for any purpose previously. If not, are people on board with dynamic queries using get operations where getnext wouldn't work? - The results would likely be some sort of dynamically created OID tree for each query. UIs such as a CLI tend to have reasonably well understood lifetimes for their route table walking routines, but MIBs have a much less well defined interface. Additionally, if you're running the same query over and over, you may end up with multiple views instatiated which may have excessive overhead. Further, you don't have any sort of static OID you can use to monitor the state of a particular route. - The results of this query would seem to be the same MIB structure as one would have for the entire routing table. MIB structure-wise, I don't think we save any complexity. If these premises are true to one extent or another, that still leads to an interesting possibility. We could still have the necessary query objects. The result would then be a rowpointer to the root of the existing routing table's subtree that matched the query. There would be no need to dynamically generate views of the routing table, however there would need to be a little intelligence in the querying routine to stop walking after you've hit a less specific route. > #3 is straightforward, especially since between #1 and #2 > we're probably changing most of the places you see an > AS number anyway. The choice I made in the updates was to simply have the base routing table be 4-byte aware. The annoying case is a 2-byte to 4-byte transition speaker where three versions of the objects may be present: The active derived set, the received 2-byte path attributes and the received 4-byte path attributes. In the interest of simplicity in the base MIB, I'm suggesting the additional transitional views be left to an extention MIB. -- Jeff _______________________________________________ Idr mailing list Idr@ietf.org https://www1.ietf.org/mailman/listinfo/idr
- [Idr] BGP MIB v2 input Susan Hares
- Re: [Idr] BGP MIB v2 input Simon Leinen
- Re: [Idr] BGP MIB v2 input Henk Uijterwaal
- Re: [Idr] BGP MIB v2 input Bill Fenner
- Re: [Idr] BGP MIB v2 input Pekka Savola
- Re: [Idr] BGP MIB v2 input Jeffrey Haas
- Re: [Idr] BGP MIB v2 input Curtis Villamizar
- Re: [Idr] BGP MIB v2 input Jeffrey Haas
- Re: [Idr] BGP MIB v2 input Curtis Villamizar
- Re: [Idr] BGP MIB v2 input Jeffrey Haas
- Re: [Idr] BGP MIB v2 input Pekka Savola
- Re: [Idr] BGP MIB v2 input Bill Fenner
- Re: [Idr] BGP MIB v2 input Jeffrey Haas
- Re: [Idr] BGP MIB v2 input Curtis Villamizar
- Re: [Idr] BGP MIB v2 input Curtis Villamizar
- Re: [Idr] BGP MIB v2 input Pekka Savola