SGM * Support in Mobile IP

SGM* Support in Mobile IP

Jiwoong LeeKorea Telecom M.com

[email protected]

Dec 2000, 49th IETF

Proposal for a WG document

draft-lee-sgm-support-mobileip-00.txt

*SGM: “Small Group Multicast” in XCAST BOF

Scalability Problemsin Mobile IP Multicast

FAInternet

HA

CN

MN1-a

MN1-b

Nested Encap.

Nested Encap.

Network Congestion!

HA2MN2

FAInternet

HA1

CN

MN1

Network Congestion!

HA3

HA4

HA5

InternetMN3

MN4

MN5

A-mass-of-multicast

TunnelConvergence*

*Refer [7] in I-D

Xcast BOF draft-boivie-sgm-01.txt

Small Group MulticastSGM Datagram

IP Header PayloadSGM Header UDP Header

“Level 3.5” Header Unicast Addresses of Destination Nodes

Video Server

SGM Router

Router

Router

Router

Router

RouterSGM

Router

SGMNo Tree.

Based on Unicast Routing

Adv: Suitable for Large number & Small size Groups

Xcast: Xcast-enabled router

IM packetfrom HA to FA COA MN (I)

FA1Internet

HA

CN

MN1

MN2

SGM

MN3

IM packet

Dest: FA1SGM list: MN1 MN2

Dest: FA2SGM list: MN3

Mobile IP Tunneling

FA2

IM packetfrom HA to FA COA MN (II)

FA1Internet

HA

CN

MN1

MN2

SGM

FA2

MN3

IM packet

Dest: FA1SGM list: MN1 MN2

Dest: FA2SGM list: MN3

SGM

When Mobile IP supports “SGM-Tunneling”

SGM list: FA1 FA2SGM list: MN1 MN2 MN3

IM packet from HA to CL COA MN

SGM has not fully specified “SGM-IM” yet.

XcastInternet

HA

CN

MN1

MN2

Xcast

MN3

Xcast

IM packet

SGM list: MN1 MN2 MN3

Pros. Cons

Solve out Scalability Problem

Suitable for upcoming 3G Cellular Networks

Flexible Multicast Transmission

Does support SGM in mobile IP

Violations of generic Mobile IP Spec.

– FA MAY generate ICMP error messages

Class D info in a SGM header

– SGM is in progress. We are now discussing this matter.

MTU gets smaller

SGM Support in Mobile IP

Jiwoong LeeKorea Telecom M.com

[email protected]

Dec 2000, 49th IETF

Hereby I propose this I-D for a WG document.

Many remarks please!

draft-lee-sgm-support-mobileip-00.txt

Note: Some contents here are augmented in addition to the proposed I-D.