Multicasting

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Multicasting
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Multicasting

• ? d?ad??as?a t?? µet?d?s?? pa??t?? ap? µ?a p???
  p??? ta µ??? µ?a? ??e?st?? ?µ?da?.
• ?fa?µ???? ?p?? ???s?µ?p??e?ta?
• ????µ?sa (web radio)
• ???ed??s?e??
• ???µ???s? ß?se?? ded?µ????
• ?ata?eµ?µ??a s?st?µata
• S??e??as?a se p?a?µat??? ?????

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IEEE 802.3 multicast d?e????se??

• MAC-level multicasting
• ?e????? MAC multicast d?e????se??
  01005e000000

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IP multicasting

• Class D d?e????se??
• 1110.

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?pe?????s? ?? se MAC multicast d?e????se??
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??a pa??de??µa d??ta??? d??t???
?p?????? µ??? e??? multicast group sta d??t?a ?1,
?3, ?5, ?6. ??se?? µet?d?s?? 1. Broadcast 2.
Multiple Unicast 3. Multicast
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Multicast d??µ?????s?

• ?p?????sµ?? spanning tree p?? pe???aµß??e? µ???
  ta d??t?a p?? pe??????? µ??? t?? ?µ?da?
• ??p?µpeta? ??a µ??? pa??t? st? d??t??
• ?? d??µ?????t?? a?apa?????? t? pa??t? µ??? p???
  ta ??ad?? t?? spanning tree.

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?a??de??µa e?p?µp?? multicast
??p?µp? pa??t??
Spanning tree
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Spanning tree ap? t?? d??µ?????t? C

• O C p??pe? ?a ?p?????se? t? spanning tree t??
  d??t??? ?aµß????ta? ?p??? t?? t?s? t?? p??? ?s?
  ?a? t?? pa?a??pt? t?? e?p?µp??.

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?pa?t?se?? ??a Multicasting

• ? ?pa??? ?at??????? d?e????se?? (p.?. Class D)
• ??t?st????s? µeta?? multicast d?e????se?? ?a?
  d?e????se?? ?p?d??t??? p?? pe??????? µ??? t??
  group.
• ??t?st????s? IP multicast addr. ?a? Link Layer
  multicast addr.
• ???aµ??? e???af? ?a? d?a??af? µ????? se ?µ?da

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?pa?t?se?? ??a Multicasting

• ?? d??µ?????t?? p??pe? ?a ?????? p??a d??t?a
  pe??????? µ??? t?? ?µ?da?
• ???pe? ?a ????? p????f???e? ??a ?a ?p?????s??? t?
  shortest path gt routing protocol
• ?pa??? ?at??????? a??????µ?? d??µ?????s??
• ?a Multicast routing paths p??pe? ?a p????pt???
  ap? t? s??d?asµ? t?? p?????sµ?? ?a? t?? p????.

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MOSPF

• Multicast Extensions to OSPF
• RFC 1584
• ???s?µ?p??e?ta? e?t?? ?.S.

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???f? pa??t?? IGMPv2 (RFC 1112)

• ?etad?deta? µ?sa se IP datagram
• ???s?µ?p??e?ta? se LANs
• Internet Group Management Protocol
• Group Address Destination Address t?? ?P
• Type 0 gt report message (??a ??ta?? st??
  ?µ?da)
• Type 1 gt a query send by an mrouter

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?a??de??µa MOSPF
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?a??de??µa MBONE
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PIM

• Protocol Independent Multicast
• ???s?µ?p??e?ta? ??a t?? µet?d?s? multicast
  ded?µ???? µeta?? ?.S.
• Dense-Mode (PIM-DM)
• ?e???? ????s? st?? ??s?de?
• Sparse-Mode (PIM-SM)

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?a??de??µa ?e?t?????a? PIM