Re: [nv-l] Routing table pulled

[Leslie Clark <lclark@us.ibm.com>]

There are a number of posts on this
topin in the archives, with good explanations of the issue, and Cisco's
recommendations. Sice this became an issue (mostly with low-end routers)
Netview as implemented the option to limit route table pulls, and it has
also implemented the use of CDP cache lookups for configuration and discovery
polling, so it relies less on the route table if CDP is enabled. However,
it will hit the route table if you explicitly pull it (eg Monitor...Network
Configuration..Route Table). So the best thing to do, if there is a real
problem with CPU, or if there is a perception that there is such a problem,
is to 
1) set the number of route table entries
pulled to some small number like 5 or 10
2) put your core routers in the seedfile
to ensure complete discovery. 
If you are using an explicit seedfile
and limiting discovery to that list, you can set it to 1 and not worry
about it.

Cordially,

Leslie A. Clark
IBM Global Services On Demand - Network Mgmt
(248) 552-4968 Voicemail, Fax, Pager

Paul Stroud <nvladmin@gmail.com>
Sent by: owner-nv-l@lists.us.ibm.com

10/14/2005 03:09 PM

Please respond to
nv-l

To	nv-l@lists.us.ibm.com
cc
Subject	Re: [nv-l] Routing table pulled

Do NOT set it to 0 as that will cause it to pull all
the routes use
1 instead.

Paul

Kain, Becki (B.) wrote:

>Do I need it configured at all?  Apparently, this person's concern
was
>under HPOV, that when it discovered a router, it made 6000 individual
>snmp get statements for each routing statement.  
>
>What is the impact of setting this to 0?
>
>
>-----Original Message-----
>From: owner-nv-l@lists.us.ibm.com [mailto:owner-nv-l@lists.us.ibm.com]
>On Behalf Of James Shanks
>Sent: Friday, October 14, 2005 2:53 PM
>To: nv-l@lists.us.ibm.com
>Subject: Re: [nv-l] Routing table pulled
>
>
>This is configurable in xnmsnmpconf, under the field "Number of
Route
>Entries".
>
>Default is 800 according to the Help, which you can verify yourself.
 If
>you think a max of 800 is too high you can set something else.
>
>Are you having a problem or just worried about one?
>
>James Shanks
>Level 3 Support  for Tivoli NetView for UNIX and Windows
>Tivoli Software / IBM Software Group
>
>
> 
>
>             "Kain, Becki
>
>             \(B.\)"
>
>             <bkain1@ford.com>
>To 
>             Sent by:      
           <nv-l@lists.us.ibm.com>
>
>             owner-nv-l@lists.
>cc 
>             us.ibm.com
>
> 
>Subject 
>                    
                  [nv-l] Routing
table pulled
>
>             10/14/2005 01:41
>
>             PM
>
> 
>
> 
>
>             Please respond to
>
>                   nv-l
>
> 
>
> 
>
>
>
>
>
>Folks:
>
>
>Apparently, under hpov, when a router was discovered, the entire routing
>table of the router was pulled as well, causing the cpu to spike because
>it pulled one route at a time.  Does NV do the same thing when
it
>discovers a node?
>
>
>Thanks
>
>
>
>
>
>  
>