Hi, Angelos. Really, it is normal in many environments for Netview
to take a long time to discover nodes. It must hear from the device,
and in many environments that will not happen. That's why you want
to use a seedfile. Just make one, put all of the important devices you
know about in it, and let it rip. Netview for NT can broadcast, but in
most environments that is prevented. Netview for Unix does not even
try that. We just use the seedfile to hurry it along. Read more about
seedfiles in the Inst & config manual, or in the man page for netmon,
or in the online help at netmon daemon configuration.
Cordially,
Leslie A. Clark
IBM Global Services - Systems Mgmt & Networking
Detroit
ÖÏÕÍÔÏÕËÁÊÇÓ ÁÃÃÅËÏÓ <agf@gnto.gr>@tkg.com on 03/22/2001 05:48:18 PM
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Subject: [NV-L] Netview 6.0.2 & 8274 Problem
Hi from Greece,
This is my first post to this group.
I am having a "small" problem with a Netview Installation at a customer's
Site.
The network consists of Token ring (80%) and Ethernet (20%) devices>
We have:
2 IBM 8274 GRS Switches
6 IBM 8250 Multiport Token ring Hubs (with Advanced Management Modules)
1 IBM 8272 Nways Token Switch
1 IBM 8273 Ethernet Switch
Various Motorola Routers (6560, 6520, 320 etc.... about 20 of them)
The Netview Server (6.0.2) is running on NT 4.0 Enterprise Server sp6a
and is connected to the Ethernet side of the network (8274 Ethernet card)
The 8274 connects (via a Token ring card) to an IBM 8250 Hub, which is
connected to the central switch 8272 of the network. (All 8250 hubs
connect to the 8272 TR switch) (We could NOT connect the 8274 TR side to
the 8272! so we had to go through an IBM 8250.... IBM Greece tried this and
had no luck also....)
The central router (Motorola 6560) has 12 WAN and 2 Token ring interfaces
The token ring side connects to the 8250 Hub mentioned above (the one with
the 8274 and 8272)
The 8274 GRS serves as a BRIDGE for our network.... It is the device that
connects the 802.3 part with the 802.5 part of our LAN.
After 3 days of operation, the Netview Server has discovered only 150 nodes
(out of 400) and the discovery process is VERY slow. (I had to ping some
nodes manually in order to get them into the map)
We are running the latest Microcode on ALL IBM machines, we have set the
correct community names and trap settings on our network devices and we
have edited the oid_to_type file to avoid badOIDs (ex. 8272, 8274, 8273)
The 8250 Hubs show up as 3Com devices (no problem there)
The 8272 Token ring switch gets drawn at the Ethernet side of the map
(along with ALL of the PC's that are not running SNMP agents, which is the
default map (bus)). The 8272 is running SNMP with the correct conf and we
have loaded the appropriate MIB files from IBM (tr_a523.mib &
dtrca523.mib). We had to add the full objectId for the 8272 @ the
oid_to_type file for Netview to recognize it as a Hub.
The REAL problem is that after I traced netmon (netmon -M -1), I get a lot
of ping timeouts (some of these errors (from netmon.trace)) :
----------------------------netmon.trace---------------------------
03/22/01 04:59:14:sending ping to 172.17.0.17 seqnum = 128 ident = 122
timeout = 4
03/22/01 04:59:14:-- received stuff 0x1 **
03/22/01 04:59:14:handle_icmp_error()-> received a port unreach with
sport!=snmp_port from 172.16.100.12
03/22/01 04:59:14:recv_pings finished within time slice, used 0 of 60000
ms.
03/22/01 04:59:14:-- received stuff 0x1 **
03/22/01 04:59:14:handle_echo_reply rtt=5759
----------------------------netmon.trace---------------------------
Note: IP 172.16.100.12 is an IBM 8274 GRS
Note2: IP 172.17.0.17 is a PC not running snmp that is alive
I also used a sniffer prog to capture the tcp/ip traffic flow on the
Netview Server's Ethernet NIC and saw that I get no ARP/RARP requests
answered. The Netview seems to be using broadcast (alot) to find various
nodes and something is ?denying? broadcast traffic, making discovery a very
slow process.
If I ping (cmd) a device, Netview immediately recognizes it and maps it.
I think that the 8274 has something to do with this situation (denying
broadcasts and ?sometimes? icmp traffic)
Can it be because the 8274 treats Netview traffic as "garbage" ?
What kind of settings / threshold limits are available on the 8274
regarding icmp and broadcast traffic ?
Any experience on Netview and 8274 ? (without NWays Manager)
Does it appear ok on your network maps?
Thanx in advance
Angelos Fountoulakis
Systems Engineer
Sysware S.A.
+301-687 2200
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