On Tuesday, July 21, 1998 12:21 PM, Jim Kellock [SMTP:jkelloc@ibm.net]
wrote:
> You mention hubs but no routers. Do you have a flat IP network? If so,
> you may have only one IP subnet.
I can see clear all of our networks and routers and I have snmp access
to our routers,
at the network level of IP topology I can see Segment1 as star center
and then hubs, switch and routers as branches from Segment1 and no other
segments.
Roman
>
> If not, I've seen this kind of problem when you are using a seedfile
> that causes discovery of devices on remote segments without
discovering
> the routers in between. On the IBM 9.0.0.0 class A, for example,
which
> is heavily subnetted, where some of us live as customers on the
> production network, where community names are not public/private just
to
> avoid multiple Netviews banging on routers, if we point to a reachable
> subnet several hops away and cannot talk snmp to any of the
intervening
> router interfaces, we often get a "9" subnet with all kinds of stuff
in
> it because Netview can't initially pick up the mask and makes
> assumptions about all the class A addresses it finds.
>
> And the append below is correct that LNM uses bridging and spanning
tree
> to display layer 2 topology, but that has no relationship to your IP
> network.
>
> I think you need to make sure your routers are being discovered.
>
> Hope that helps.
>
> Uwe Richter wrote:
> >
> > Hallo Roman,
> >
> > you have right.
> > I don't sure, but I thing Netview makes more Segments in
Network-Submap, then
> > Netview detect more Interface-Types (over SNMP) in a IP-Network.
> > I've seen a Layer2-Network with Nways and LNM-Option.
> >
> > Does anybody known this perfectly ?
> >
> > Uwe
> >
> > >===== Original Message From Tuchyna Roman
<SMTP:NV-L@UCSBVM.UCSB.EDU> =====
> > >On Tuesday, July 21, 1998 9:38 AM, Uwe Richter
> > >[SMTP:Uwe.Richter@SYNTHESIS.DE] wrote:
> > >> Have you the right SNMP-Communities?
> > >> Netview need the SNMP-Communities for Discover the Subnetmask,
then
> > >> you don't use the default mask.
> > >>
> > >
> > >Yes, I can use xnmbrowser for checking snmp variables from hubs,
but I
> > >guess netmon needs subnetmask just for discovering networks,
segment
> > >discovering is realized by identifying connector devices such hubs,
> > >bridges... (maybe I'm wrong...???)
> > >
> > >Roman
> > >
> > >
> > >> regards
> > >> Uwe
> > >>
> > >>
> > >> >===== Original Message From Tuchyna Roman
<SMTP:NV-L@UCSBVM.UCSB.EDU>
> > >=====
> > >> >Hello,
> > >> >
> > >> >We have following problem: in our network NV 5 can't discover
> > >segments.
> > >> >All nodes are placed in one segment, so every network contains
just
> > >one
> > >> >segment. We are using 3Com hubs (with management module)
SuperStack
> > >II,
> > >> >switch LinkSwitch 1000 and some hubs without management module.
> > >> >Modification of entries for these hubs in oid_to_type (flags H
or B)
> > >> >doesn't help.
> > >> >
> > >> >Does anybody have any similar skills?
> > >> >
> > >> >TIA
> > >> >
> > >> >Roman
> > >> >
> > >> >------------------------------------------------------------
> > >> >Roman Tuchyna ADDRESS: Datasys, s.r.o.
> > >> >TEL: +4202 61388211,61388241 Sinkulova 77/23
> > >> >FAX: +4202 61388210 147 00 Praha 47
> > >> >E-MAIL: tuchyna@datasys.cz Czech Republic
> > >> >
> > >> >#include <std_disclaimer.h>
> > >> >------------------------------------------------------------
> > >
> > >
> > >------------------------------------------------------------
> > >Roman Tuchyna ADDRESS: Datasys, s.r.o.
> > >TEL: +4202 61388211,61388241 Sinkulova 77/23
> > >FAX: +4202 61388210 147 00 Praha 47
> > >E-MAIL: tuchyna@datasys.cz Czech Republic
> > >
> > >#include <std_disclaimer.h>
> > >------------------------------------------------------------
------------------------------------------------------------
Roman Tuchyna ADDRESS: Datasys, s.r.o.
TEL: +4202 61388211,61388241 Sinkulova 77/23
FAX: +4202 61388210 147 00 Praha 47
E-MAIL: tuchyna@datasys.cz Czech Republic
#include <std_disclaimer.h>
------------------------------------------------------------
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