By way of explanation, I think it was assumed that when Router B went
down, the adjoining interface on Router A would stay up, making it
more clear just where the problem was. Lately I have been seeing that
in most networks, Router A shows its interface as down as well. So
the event you need to respond to is Router Marginal. That will not be the
case in all kinds of networks. Les is right: Any interface outage on a
router must be handled as serious. That means of course that you must
clean up all of those miscellaneous down interfaces that are making
routers yellow on a regular bases: deconfigure old unused interfaces,
convert to snmp polling for those which you can poll but not ping,
unmanage BRIs, etc. So your map is all green under normal circumstances,
and any yellow is to be investigated.
Cordially,
Leslie A. Clark
IBM Global Services - Systems Mgmt & Networking
Detroit
James Shanks/Raleigh/IBM@IBMUS@tkg.com on 06/26/2001 02:51:56 PM
Please respond to IBM NetView Discussion <nv-l@tkg.com>
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Subject: Re: [NV-L] RFI not very useful?
Another alternative mightb to change the propagation rules for your map
(use Edit --> Modify/Describe --> Map)
and chnage from the default to either "Propagate Most Critical" so that any
red causes the parent to go red, or "Propagate At Threshold Value"
and see if you like the results better.
James Shanks
Team Leader, Level 3 Support
Tivoli NetView for UNIX and NT
"Les Dickert" <lesdickert@HOTMAIL.COM>@tkg.com on 06/26/2001 02:25:17 PM
Please respond to IBM NetView Discussion <nv-l@tkg.com>
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Subject: Re: [NV-L] RFI not very useful?
Probably nothing to do to "improve" the
situation other than how you deal with
them.
We treat yellow routers as bad and go
drilling for the red. Usually it is
an interface down, which is bad.
Also, you should be getting an "Interface
Down" event, which is usually also bad,
especially if they aren't supposed to go
down.
Main message: Yellow is bad.
Les Dickert
Verisign Consulting
>From: thierry.van-mol@CIEV.vd.ch
>Reply-To: IBM NetView Discussion <nv-l@tkg.com>
>To: " - *nv-l@tkg.com" <nv-l@tkg.com>
>Subject: [NV-L] RFI not very useful?
>Date: Tue, 26 Jun 2001 18:42:05 +0200
>
>
>I found out a behaviour of RFI which let me think that I might need
>to turn it off on our network. Situation is like this:
>
>
>
>
>Netview --------- Router A -------------- Router B ------- Subnet B
> Serial link
> PPP
>
>
>
>Serial link is configured with a IP subnet of 30 bits (255.255.255.252
>mask).
>
>Now, when Router B is switch off completely (power failure):
>
>- Subnet B and Router B becomes white (unreachable)
>
>- Router A becomes yellow
>
>- several interface, segment and network down events. A router marginal
> event for both router A and router B
>
>- no Node down or Router down event for Router B is sent. I don't even get
>a
> Router unreachable event (?)
>
>This behavior match the description of RFI in the doc. Indeed all subnets
>to which Router B is connected are unreachable (since the serial interface
>on router A went down, the subnet of the serial link has no more reachable
>host). But I think that for the operator, the representation is
misleading:
>this is a very serious outage in the network, and the root fault is Router
>B.
>But I don't see anything becoming red on the Home submap, and no major
>event like "Node down" comes in. Only a marginal event for router A.
>
>Does anybody has a suggestion for improving this situation?
>
>
>Thierry
>
>
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