Transcript
Using ALTO (Application-Layer Traffic Optimization) for CDN
2012.08.01
(Last Updated: 2012.08.20)
NMC Consulting Group
www.netmanias.com/www.nmcgroups.com
Basic ALTO Architecture (draft-ietf-alto-protocol-12 )
1. Using ALTO for CDN (background: Without ALTO)
Static Configuration
- Request Router에 Edge Server 정보와 End User Subnet 정보를 운영자가 직접 설정함
- 단점: CDN 운영자와 NSP가 같은 회사이어야 함
- 단점: Region별 End User Subnet 변경시 운영자의 수작업이 필요함 (Operational Overhead)
2. Using ALTO for CDN
ALTO
- CDN 사업자와 NSP 사업자가 다른 경우 적합함 (같아도 상관없음)
- 장점: CDN 운영자가 수동으로 Zone File을 Request Router에 설정(Static Configuration)하지 않아도 됨. Region별 Subscriber IP Subnet이 자주 변경되는 경우 운영상 오버헤드를 줄여줌
- 장점: NSP는 CDN (RR)에게 Ranking 정보만 제공함으로써 실제 Physical Network Topology, Routing Topology 등 망 정보를 감출 수 있음
3. Using ALTO for CDN: Nearest (ALTO) + Edge Server Load
- ALTO Server의 Ranking Algorithm은 표준화 대상이 아님
4. Using ALTO for CDN: Nearest (ALTO) + Edge Server Load
5. Using ALTO for CDN: Dynamic Network Information (example)
References
-Internet-Draft, ALTO Protocol, July 11, 2012
-Internet-Draft, Use Cases for ALTO within CDN, June 10, 2012
-Internet-Draft, ALTO Deployment Considerations, March 20, 2012
Using ALTO (Application-Layer Traffic Optimization) for CDN
2012.08.17
(Last Updated: 2012.08.20)
NMC Consulting Group
www.netmanias.com/www.nmcgroups.com
Basic ALTO Architecture (draft-ietf-alto-protocol-12 )
1. Using ALTO for CDN (background: Without ALTO)
Static Configuration
- Operator configures “edge server & end user subnet info” to the Request Router
- Disadvantage: CDN must be controlled by the same entity as ALTO server
- Disadvantage: When “end user subnet” is changed, operator should change configuration manually (Operational Overhead)
2. Using ALTO for CDN
ALTO
- NSP & CDN may be operated by different entities (even within the same operator) ? Decouples the CDN application from the network
- Advantage: It’s not required to configure Request Router manually. It can reduce operational overhead when “subscriber IP subnet” is changed frequently
- Advantage: NSP can hide physical network and routing topology from the CDN operator because only “ranking information” will be provided
3. Using ALTO for CDN: Nearest (ALTO) + Edge Server Load
- Ranking Algorithm of ALTO Server is not subjected to standard
4. Using ALTO for CDN: Nearest (ALTO) + Edge Server Load
5. Using ALTO for CDN: Dynamic Network Information (example)
References
-Internet-Draft, ALTO Protocol, July 11, 2012
-Internet-Draft, Use Cases for ALTO within CDN, June 10, 2012
-Internet-Draft, ALTO Deployment Considerations, March 20, 2012
