Configuring Sdr Listener Support - Cisco Catalyst 3750-E Software Configuration Manual

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 multimedia content is often broadcast over the MBONE. Before
you can join a multimedia session, you need to know what multicast group address and port 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 port 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 is displayed 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.
Command
Step 1 configure terminal
Step 2
interface interface-id
Step 3
ip sdr listen
Step 4 end
Step 5 show running-config
Step 6
copy running-config startup-config
To disable sdr support, use the no ip sdr listen interface configuration command.
Limiting How Long an sdr Cache Entry Exists
By default, entries are never deleted from the sdr cache. You can limit how long the entry remains active
so that if a source stops advertising SAP information, old advertisements are not needlessly kept.
Catalyst 3750-E and 3560-E Switch Software Configuration Guide
46-46
Purpose
Enter global configuration mode.
Specify the interface to be enabled for sdr, and enter interface
configuration mode.
Enable sdr listener support.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Chapter 46 Configuring IP Multicast Routing
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