sgm * support in mobile ip
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SGM* Support in Mobile IP
Jiwoong LeeKorea Telecom M.com
porce@computer.org
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
porce@computer.org
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.
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