You mention hubs but no routers. Do you have a flat IP network? If so,
you may have only one IP subnet.
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 AT UCSBVM.UCSB DOT EDU>
> >=====
> >On Tuesday, July 21, 1998 9:38 AM, Uwe Richter
> >[SMTP:Uwe.Richter AT SYNTHESIS DOT 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 AT UCSBVM.UCSB DOT
> >> >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 AT datasys DOT 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 AT datasys DOT cz Czech Republic
> >
> >#include <std_disclaimer.h>
> >------------------------------------------------------------
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