nv-l

Re: [nv-l] RFI : meaning of "Interface has no connectivity in unreachable region" ?

2003-08-11 01:59:32
Subject: Re: [nv-l] RFI : meaning of "Interface has no connectivity in unreachable region" ?
From: "Hendrik Zahn" <hendrik.zahn AT de.ibm DOT com>
To: "Philippe Menard" <PME AT fr.ibm DOT com>
Date: Mon, 11 Aug 2003 07:59:05 +0200
Hello Philippe,
I had a customer who checked against the specific trap id of NVIDWN_EV
inside of rulesets. Now with this new trap which has the
same specific trap id cust got some trouble.
I contacted development that time and got following response:

"...
for 7.1.3 he may want to ignore this trap - grep for "unreachable" in
varbind 3.  It is only issued
for a nonresponding  interface that after the RFI algorithm, turns out to
belong to an Unreachable network.
This event is required for the Switch Analyzer and we should look at
changing its specific id.
...
The change of the specific trap id is considered to be made in next
release.
..."

I don't know if this is already changed with 7.1.4 .


MfG./ Best regards
Hendrik Zahn (L2 EMEA Tivoli NetView Support)
E-Mail: hendrik.zahn AT de.ibm DOT com
__________________________________
Need help with Tivoli Software Products?
http://www.ibm.com/software/sysmgmt/products/support/


                                                                                
                                                            
                      Philippe                                                  
                                                            
                      Menard/France/Cont        To:       nv-l AT lists.tivoli 
DOT com                                                             
                      r/IBM@IBMFR               cc:       pstroud AT bellsouth 
DOT net                                                             
                                                Subject:  Re: [nv-l] RFI : 
meaning of "Interface has no connectivity in unreachable region" 
                      08.08.03 20:13             ?                              
                                                            
                                                                                
                                                            
                                                                                
                                                            





I think I'm seeing the light. Do you agree with
- "Interface has no connectivity in unreachable region"  means  "Interface
is unreachable" i.e. "Interface in unknown state"
- "Interface down" (a fact) should have higher priority than "Interface
unreachable" (no information)
- the reason the interface is unreachable is that other (router) interfaces
are down (high priority !)

Philippe.

- - -

Philippe MÉNARD
Networking Delivery Support Center
Mail : pme AT fr.ibm DOT com
Phone : +33 (0)4 92 11 48 69
Fax : +33 (0)4 93 24 49 07



                                                                          
   Paul Stroud                                                            
   <pstroud AT bellsouth DOT ne         To:        Philippe                     
 
   t>                    Menard/France/Contr/IBM@IBMFR,                   
                         nv-l AT lists.tivoli DOT com                           
 
                                 cc:        Stephen                       
   08/08/2003 19:37      Hochstetler/Austin/IBM@IBMUS                     
   Please respond to             Subject:        Re: [nv-l] RFI : meaning 
   pstroud               of "Interface has no connectivity in unreachable 
                         region" ?                                        
                                                                          
                                                                          
                                                                          




At that point, the device is not "down", it is acutally unreachable,
NetView
knows this so it changes the status from "down" to "unreachable". For this
to happen a trap must be generated and processed. This will update the
status in the database.

Paul



On Friday 08 August 2003 13:32, Philippe Menard wrote:
> Stephen,
>
> I know the purpose of RFI and I see we share the same definition of an
> unreachable region.
>
> What I can't understand is : once a region is unreachable, what
additional
> information is provided
> by the "Interface has no connectivity in unreachable region" event ?
Don't
> we already know
> that all the interfaces connected to this region are down ? Am I missing
> something obvious ?
>
> Best regards,
> Philippe.
>
> - - -
>
> Philippe MÉNARD
> Networking Delivery Support Center
> Mail : pme AT fr.ibm DOT com
> Phone : +33 (0)4 92 11 48 69
> Fax : +33 (0)4 93 24 49 07
>
>
>
>
>
>
> Stephen Hochstetler/Austin/IBM@IBMUS
> 08/08/2003 19:05
>
>
>         To:     Philippe Menard/France/Contr/IBM@IBMFR,
> nv-l AT lists.tivoli DOT com cc:
>         Subject:        Re: [nv-l] RFI : meaning of "Interface has no
> connectivity in unreachable region" ?
>
>
>
>
>
>
>
> I am going to take a shot at this....and let Paul or someone else let me
> know if this is wrong.    RFI is suppose to reduce the number of
> IBM_NVIDWN_EV being send when a whole subnet is not pingable by NetView.
> How does NetView know this....simply by NetView knowing all the router
> interfaces in a particular subnet.    When NetView sees all the Router
> interfaces down in a single subnet, NetView is smart enough to know it
> will
> not be able to ping any computers in that subnet...so it stops polling
the
> computers.   But it still pings the router interfaces waiting for them to
> come back up.
>
> Case 1:  The interface is down.    No known impact to other
> nodes/interfaces is known.   If this is from a router, then NetView must
> be
> able to ping other router interfaces in that subnet yet.
>
> Case 2:  The interface is down.   Since NetView is suppose to stop
pinging
> computers in an unreachable region, then this must be coming from the
> router interface that signifies that ALL router interfaces are down in
> that
> subnet (unreachable region).    I would say that this reported "problem"
> should have higher priority than case 1, since a whole region of the
> network is affected.
>
>
>
>
> Stephen Hochstetler              shochste AT us.ibm DOT com
> International Technical Support Organization at IBM
> Office - 512-838-6198 (t/l 678)       FAX - 512-838-6931
> http://www.redbooks.ibm.com
>
> |---------+---------------------------->
> |
> |         |           "Philippe Menard"|
> |         |           <PME AT fr.ibm DOT com> |
> |         |
> |         |           08/08/2003 11:50 |
> |         |           AM               |
> |
> |---------+---------------------------->
> |
> >
--------------------------------------------------------------------------
> >------------------------------------|
> >
>   |       To:       nv-l AT lists.tivoli DOT com       |
>   |       cc:                                       |
>   |       Subject:  [nv-l] RFI : meaning of "Interface has no
connectivity
>
> in unreachable region" ?              |
>
> >
--------------------------------------------------------------------------
> >------------------------------------|
>
> All,
>
> NV 7.1.3, AIX 4.3.3
>
> I have realized that the IBM_NVIDWN_EV event (EID = nv6000, specific =
> 58916867) is now used in (at least) two cases :
> 1- the usual Interface Down event with a description such as "Interface
> Ethernet0 down."
> 2- the RFI event with a description such as "Interface Ethernet0 has no
> connectivity in unreachable region"
>
> Please could someone explain the meaning of the second event.
> Is it OK to consider this event as a plain "Interface Down" event ? (as
> suggested by the reuse of the trap)
>
> Best regards,
> Philippe.
>
> - - -
>
> Philippe MÉNARD
> Networking Delivery Support Center
> Mail : pme AT fr.ibm DOT com
> Phone : +33 (0)4 92 11 48 69
> Fax : +33 (0)4 93 24 49 07
>
>
>
>
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*NOTE*
This is not an Offical Tivoli Support forum. If you need immediate
assistance from Tivoli please call the IBM Tivoli Software Group
help line at 1-800-TIVOLI8(848-6548)