IPv6 Subnet Model AnalysisIPv6 Subnet Model Analysis

Syam MadanapalliSyam MadanapalliLogicaCMGLogicaCMG

On-behalf of v6subnet Design TeamOn-behalf of v6subnet Design TeamPresented byPresented by

Soohong Daniel ParkSoohong Daniel Park

The Design Team ParticipantsThe Design Team Participants• Dave ThalerDave Thaler• David JohnstonDavid Johnston• Junghoon JeeJunghoon Jee• Max RiegelMax Riegel• Myungki ShinMyungki Shin• Syam Madanapalli. Syam Madanapalli. • James KempfJames Kempf• Behcet SarikayaBehcet Sarikaya• Basavaraj PatilBasavaraj Patil• JinHyeock ChoiJinHyeock Choi• 16ng chairs16ng chairs

– Gabriel MontenegroGabriel Montenegro– Soohong Daniel ParkSoohong Daniel Park

• Shepherding ADShepherding AD– Jari ArkkoJari Arkko

The GoalThe Goal

• To analyze the IPv6 link models that can be To analyze the IPv6 link models that can be applied for the 802.16 based networksapplied for the 802.16 based networks

• And recommend preferably one link model And recommend preferably one link model for the standardizationfor the standardization

The Models ConsideredThe Models Considered

• NBMA Link ModelNBMA Link Model– Shared Prefix ModelShared Prefix Model

• Point-to-point Link ModelPoint-to-point Link Model– Unique Prefix ModelUnique Prefix Model

• Multicast Capable Link ModelMulticast Capable Link Model– Ethernet Like ModelEthernet Like Model

L3

L2

L1BS

ARTunnelTunnelMAC Conn.MAC Conn.

Shared LinkShared Link

NBMA Link ModelNBMA Link Model

• The AR, Multiple BSs attached to the AR and all MSs attached The AR, Multiple BSs attached to the AR and all MSs attached to these BSs forms an IP Linkto these BSs forms an IP Link

• One or more prefixes are assigned to the linkOne or more prefixes are assigned to the link• DAD is performed using Relay DADDAD is performed using Relay DAD

P2P Link ModelP2P Link Model

• P2P LinkP2P Link– Using PPPUsing PPP

• No PPP CS existNo PPP CS exist– Using L2 tunnelUsing L2 tunnel

• Per MS GRE TunnelPer MS GRE Tunnel– VLAN Tag (802.1q)VLAN Tag (802.1q)

• May not support sufficient MSs; Max. 4KMay not support sufficient MSs; Max. 4K

P2P Link 2P2P Link 2

MS1MS1

ARARTunnelTunnelMAC Conn.MAC Conn.

MS3MS3

MS2MS2

P2PP2P Link 1 Link 1

TunnelTunnelMAC Conn.MAC Conn.

P2P Link 3P2P Link 3

TunnelTunnelMAC Conn.MAC Conn.

BSBS

Multicast Capable Link ModelMulticast Capable Link Model

• Similar to Ethernet Link ModelSimilar to Ethernet Link Model• Supports full multicast with BridgingSupports full multicast with Bridging• BS is required to do multicast filtering for not to deliver BS is required to do multicast filtering for not to deliver

unwanted packets to MSs that are not part of the multicast unwanted packets to MSs that are not part of the multicast groupgroup

MS1MS1

AR1AR1

MS3MS3

MS2MS2

BS2BS2

BS1BS1

AR2AR2

MS4MS4

Prefix AssignmentPrefix Assignment

• NBMA Link ModelNBMA Link Model– All MSs share one ore more prefixes that are All MSs share one ore more prefixes that are

assigned to the linkassigned to the link

• P2P Link ModelP2P Link Model– One or more prefixes are assigned to an MSOne or more prefixes are assigned to an MS

• Multicast Capable Link ModelMulticast Capable Link Model– All MSs share one ore more prefixes that are All MSs share one ore more prefixes that are

assigned to the linkassigned to the link

Address AutoconfiguratioAddress Autoconfiguratio

• All link models support standard IPv6 address All link models support standard IPv6 address autoconfiguration methods defined in RFC autoconfiguration methods defined in RFC 2462 and DHCPv62462 and DHCPv6

Duplicate Address DetectionDuplicate Address Detection

• NBMA Link ModelNBMA Link Model– Relay DADRelay DAD– Based on Address Cache Based on Address Cache

• P2P Link ModelP2P Link Model– DAD is required for link local addresses between DAD is required for link local addresses between

MS and ARMS and AR

• Multicast Capable Link ModelMulticast Capable Link Model– As defined in RFC 2462As defined in RFC 2462

Reuse of existing standardsReuse of existing standards

• All models reuse the existing standardsAll models reuse the existing standards

On-link Multicast SupportOn-link Multicast Support

• NBMA Link ModelNBMA Link Model– AR can provide proxyingAR can provide proxying– Selective multicastSelective multicast

• P2P Link ModelP2P Link Model– Only two nodes exists on the linkOnly two nodes exists on the link

• Multicast Capable Link ModelMulticast Capable Link Model– Full support for mFull support for muulticastlticast

Consistency in IP Link DefinitionConsistency in IP Link Definition

• NBMA Link ModelNBMA Link Model– External and link local traffic needs to be External and link local traffic needs to be

differentiateddifferentiated

• P2P Link ModelP2P Link Model– Either PPP or per MS GRE tunnel is requiredEither PPP or per MS GRE tunnel is required

• Multicast Capable Link ModelMulticast Capable Link Model– Full compliance to RFC 2461Full compliance to RFC 2461

Packet ForwardingPacket Forwarding

• NBMA Link ModelNBMA Link Model– External packets are routedExternal packets are routed– On-link packets are bridgedOn-link packets are bridged

• P2P Link ModelP2P Link Model– Works normallyWorks normally

• Multicast Capable Link ModelMulticast Capable Link Model– Location of the bridgingLocation of the bridging• AR – for WiMAX NetworksAR – for WiMAX Networks

Effect on Dormant ModeEffect on Dormant Mode

• NBMA Link ModelNBMA Link Model– Not affectedNot affected

• P2P Link ModelP2P Link Model– Not affectedNot affected

• Multicast Capable Link ModelMulticast Capable Link Model– BS needs to implement multicast filteringBS needs to implement multicast filtering

Changes to Host ImplementationsChanges to Host Implementations

• NBMA Link ModelNBMA Link Model– NoneNone

• P2P Link ModelP2P Link Model– ??

• Multicast Capable Link ModelMulticast Capable Link Model– NoneNone

Changes to Router ImplementationsChanges to Router Implementations

• NBMA Link ModelNBMA Link Model– Relay DADRelay DAD• Address CacheAddress Cache

– May not complete due to packet loss etcMay not complete due to packet loss etc

• P2P Link ModelP2P Link Model– Unique prefix assignmentUnique prefix assignment

• Multicast Capable Link ModelMulticast Capable Link Model– Bridging is requiredBridging is required

RenumberingRenumbering

• NBMA Link ModelNBMA Link Model• P2P Link ModelP2P Link Model– more signaling traffic comparing with shared more signaling traffic comparing with shared

prefix modelprefix model

• Multicast Capable Link ModelMulticast Capable Link Model

SeND SupportSeND Support

• All models support usage of SeNDAll models support usage of SeND

ApplicabilityApplicability

• NBMA Link ModelNBMA Link Model– Mobile WIMAX and WiBroMobile WIMAX and WiBro

• P2P Link ModelP2P Link Model– Mobile WIMAX and WiBroMobile WIMAX and WiBro

• Multicast Capable Link ModelMulticast Capable Link Model– Fixed and Nomadic deploymentFixed and Nomadic deployment