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What is a dynamic service addition request (DSA-REQ)?

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crsrikanth84
What is a dynamic service addition request (DSA-REQ)?

Hi,
I am going through the D3.0 security spec .. Can somebody guide me on
1. what is a dynamic service addition request(DSA-REQ)?
2. When is it used?
3. Is it related only to multicast traffic?

Thaks in advance ..