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Catalyst 3750 Metro Switch Software Configuration Guide
78-15870-01
Chapter 31 Configuring IP Multicast Routing
Configuring Optional Multicast Routing Features
Configuring sdr Listener Support
The MBONE is the small subset of Internet routers and hosts that are interconnected and capable of
forwarding IP multicast traffic. Other interesting multimedia content is often broadcast over the
MBONE. Before you can join a multimedia session, you need to know what multicast group address and
interface are being used for the session, when the session is going to be active, and what sort of
applications (audio, video, and so forth) are required on your workstation. The MBONE Session
Directory version 2 (sdr) tool provides this information. This freeware application can be downloaded
from several sites on the World Wide Web, one of which is http://www.video.ja.net/mice/index.html.
SDR is a multicast application that listens to a well-known multicast group address and interface for
Session Announcement Protocol (SAP) multicast packets from SAP clients, which announce their
conference sessions. These SAP packets contain a session description, the time the session is active, its
IP multicast group addresses, media format, contact person, and other information about the advertised
multimedia session. The information in the SAP packet appears in the SDR Session Announcement
window.
Enabling sdr Listener Support
By default, the switch does not listen to session directory advertisements.
Beginning in privileged EXEC mode, follow these steps to enable the switch to join the default session
directory group (224.2.127.254) on the interface and listen to session directory advertisements. This
procedure is optional.
To disable sdr support, use the no ip sdr listen interface configuration command.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Specify the interface to be enabled for sdr, and enter interface
configuration mode.
Step 3
ip sdr listen Enable sdr listener supinterface.
Step 4
end Return to privileged EXEC mode.
Step 5
show running-config Verify your entries.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.
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