Hi Winfried,
First off, the packets are multicast, not broadcast. Secondly, these
packets should not be passed by a router. The packets allow the NMMs and
switches on a network to trasmit topology information to each other. Since
a router deliniates a subnet boundary, these flatnet hello packets should
stop at the router. This information is used by the Autotopology(tm)
process found in Optivity NMS. And as for your final questions, normally
we recommend placing a filer on the router to drop the destination address
of the multicast packet.
There's a great table outlining all this in the "Getting Started" manual
for Optivity NMS 8.1 on page 1-8 (Table 1-1). You can find this manual at:
http://support.baynetworks.com/library/tpubs/nav/netman/enter.htm#OPTNM81
Hope this answers your questions.
-David J. Easter
Product Manager - Optivity NMS, Network Management Division
Bay Networks, Inc. - Where Information Flows.
-=-REgarding-=-
At 10:14 AM 6/17/98 +0100, Winfried Gehrig wrote:
>Hello Netview/Optivity-folks around the world,
>
>we would like to reduce unnecessary broadcast traffic flooding our
>Wide-Area-Network.
>
>Besides a lot of other things, Bay-Token-Ring-Hubs are sending out
>frames which I assume are not necessary for the Netview- nor the
>Optivity-Autotopology-function.
>
>Here are two of them as an example for You:
>
>Destination Source Summary
>C00081000000 SynOpt149FD6 DLC AC=10, FC=40, FS=CC
> RI Limited Broadcast Fwrd
>(260)-1-(005)-1-(200)
> LLC C D=AA S=AA UI
> SNAP ID=SynOpt 000081 Type=0100
>
>
>Destination Source Summary
>C00081000000 SynOpt149FD6 DLC AC=10, FC=40, FS=CC
> RI Broadcast Fwrd (260)-1-(005)-1-(200)
> LLC C D=AA S=AA UI
> SNAP ID=SynOpt 000081 Type=0100
>
>The frames are sent out 2 times per 10 seconds as Single-Route- and
>All-Route-Broadcast destined to C0-00-81-00-00-00, from one
>Bay-Hub per IP-subnet.(Socalled Dispatch-NMM in Optivity)
>Because we have around 200 subnets around the world with Bay-hubs in it,
>I receive around 40 frames per second Broadcast from our WAN-Router.
>
>The frames contain information about MAC- and IP-adresses of BAY-boxes
>within the original-IP-subnet.
>
>The Optivity-manuals say that socalled Flat-network-multicast-packets
>from Dispatch-NMMs should be discarded by the router.
>I assume that our Cisco-routers are configured for RSRB and therefore
>bridging this broadcast into other subnets.
>
>To ensure the accuracy of Optivity Flat Network Views, the manual states
>that flat network hellos must be discarded by the router.
>
>Now my questions to the Optivity-folks among You:
>
>1. What is the purpose of this broadcast? Is it really a Flat-Net-Hello ?
>
>2. Is this broadcast to C0-00-81-00-00-00 necessary to be routed over
> the WAN-links to support the Autotopology-process of Optivity ?
>
>3. If not, does anybody know the best way of filtering these broadcast
> within a Cisco-router ?
> Is it better to set up a MAC-address-filter on C00081000000 or is it
> better to filter the SNAP-ID 000081 Type 0100.
> A little example of a filter-list is highly appreciated.
>
>
>Thank You for Your help in advance
>
>
> ```
> (o o)
>------------------oOO-(_)-OOo------------------
>Winfried Gehrig Winfried.Gehrig@skf.com
>SKF GmbH FON ++49(0)9721 56 3077
>Schweinfurt(Germany) FAX ++49(0)9721 56 3266
>
>Our bearings turn the planet
>http://www.skf.com
>-----------------------------------------------
>
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