Cabletron Systems SmartSwitch 8-slot, User'S Reference Manual

Page: 112 / 150

Chapter 7: Multicast Routing Configuration Guide
7 - 6 SSR User Reference Manual
TTL thresholding is not always considered useful. There is another approach of a range
of multicast addresses for “administrative” scoping. In other words, such addresses
would be usable within a certain administrative scope, a corporate network, for
instance, but would not be forwarded across the internet. The range from 239.0.0.0
through 239.255.255.255 is being reserved for administratively scoped applications.
Any organization can currently assign this range of addresses and the packets will not
be sent out of the organization. In addition, multiple scopes can be defined on per-
interface basis.
To prevent the SSR from forwarding any data destined to a scoped group on an
interface, enter the following command in the Configure mode:
Configure a DVMRP Tunnel
The SSR supports DVMRP tunnels to the MBONE (the multicast backbone of the
Internet). You can configure a DVMRP tunnel on a router if the other end is running
DVMRP. The SSR then sends and receives multicast packets over the tunnel.
DVMRP tunnels need to be created before being enabled. Tunnels are recognized by
the tunnel name. Once a DVMRP tunnel is created, you can enable DVMRP on the
interface.
To configure a DVMRP tunnel, enter the following command in Configure mode:
You can also control the rate of DVMRP traffic in a DVMRP tunnel. The default rate
is 500 Kbps.
To control the rate of DVMRP traffic, enter the following command in Configure
mode:
Configure the DVMRP scope.
dvmrp set interface <ip-addr> scope <ip-
addr/mask>
Configure a DVMRP tunnel to
MBONE.
dvmrp create tunnel
<string> local <ip-
addr> remote
<ip-addr>
Configure the rate in a DVMRP tunnel.
dvmrp set interface <ip-addr> rate
<number>