Understanding SAP and SDP Multicast Session Announcements

Multicast session announcements are handled by two protocols, the Session Announcement Protocol (SAP), and Session Description Protocol (SDP). These two protocols display multicast session names and correlate the names with multicast traffic. Enabling SDP and SAP allows the router to receive announcements about multimedia and other multicast sessions from sources. Enabling SAP automatically enables SDP.

The device listens for session announcements on one or more addresses and ports. By default, the router listens to address and port 224.2.127.254:9875.

Related Topics

• Junos OS Feature Support Reference for SRX Series and J Series Devices
• Multicast Overview
• Example: Configuring SAP and SDP to Listen for Session Announcements (CLI)