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Webcast-Catalyst9k
New Member

TCP, UDP and Multicast

As far as I know almost all the applications using multicast send data over UDP.

But you could use instead TCP.

If what I'm stating is true, how does the TCP acknowledge behave in this case? Does it go back to the multicast source?

Please clarify

Thanks!

3 REPLIES
Cisco Employee

Re: TCP, UDP and Multicast

You can't use TCP over Mcast since TCP is session based. As you stated UDP is the protocol of choice for Mcast applications. Other non session based protocol such as IGMP, OSPF, EIGRP, RIP also use Mcast for message delivery.

Let me know if I answered your question,

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
New Member

Re: TCP, UDP and Multicast

Hi Harold,

Pls forgive my ignorance..

But could you pls explain, why we cant use a session based protocol over multicast..?

Theoretically,it is session between multicast source and each multicast client...Pls correct me if I am wrong..

Thanks in advance

Thomas.

Cisco Employee

Re: TCP, UDP and Multicast

Mcast is point to multipoint. A TCP session is between two host (p2p). TCP was not designed to handle p2mp.

Hope this helps,

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
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