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Host-based IPv6 Multicast Addresses Allocation draft-park-host-based-mcast-01.txt. Jung-Soo Park, Myung-Ki Shin, Yong-Jin Kim ETRI 52nd IETF – Salt Lake City. What is this about. An extension to the multicast addressing architecture of IPv6

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host based ipv6 multicast addresses allocation draft park host based mcast 01 txt

Host-based IPv6 Multicast Addresses Allocationdraft-park-host-based-mcast-01.txt

Jung-Soo Park, Myung-Ki Shin, Yong-Jin Kim

ETRI

52nd IETF – Salt Lake City

what is this about
What is this about
  • An extension to the multicast addressing architecture of IPv6
  • Each host (interface) uses Interface ID to allocate it’s own multicast addresses without any server
  • Especially useful in Zeroconf environment
background

4-bit

8-bit

4-bit

112-bit

FF

flgs

scop

group ID

Background
  • Multicast addressing architecture of IPv6
    • Does not contain any built-in support for dynamic address allocation
unicast prefix based m a by brian haberman dave thaler

8 bits

flags

4 bits

8 bits

8 bits

64 bits

32 bits

11111111

00PT

reserved

plen

group ID

scope

network prefix

Unicast prefix-based M. A.(by Brian Haberman & Dave Thaler)
  • Multicast address format
    • P flag is used to indicate a multicast address that is assigned based on the network prefix
    • plen indicates the actual number of bits in the network prefix field that identify the subnet
host based multicast address i

16-bit

32-bit

4-bit

8-bit

4-bit

64-bit

11111111

flgs

scop

reserved

Interface ID

group ID

Host-based multicast address (I)
  • Link-local multicast address format
    • flgs field should use the same flags defined in section 3 of unicast prefix-based method
    • interface ID field is used to distinguish each host and is derived from unicast address
host based multicast address ii

16-bit

32-bit

4-bit

8-bit

4-bit

64-bit

11111111

flgs

scop

SLA

Interface ID

group ID

Host-based multicast address (II)
  • Site-local multicast address format
    • SLA value is obtained from the network prefix contained in the RA message to distinguish a site
discussion proposal
Discussion & Proposal
  • Distinction between host-based and unicast prefix-based M. A. is required
    • Because the flgs field use the same flags defined in section 3 of unicast prefix-based draft
    • The value of scope field can be used
      • For scope <= 5, host-based MA
      • For scope > 5, unicast prefix-based MA
  • Modifications in unicast prefix-based draft ?
  • IPv6 WG draft
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