View Full Document

A Scalable Switch for Service Guarantees



View the full content.
View Full Document
View Full Document

3 views

Unformatted text preview:

A Scalable Switch for Service Guarantees Bill Lin Isaac Keslassy University I I NTRODUCTION A Background There has been recent interest in a class of switch architectures called load balanced routers 2 6 This class of architectures is based on a load balanced switch architecture where two identical stages of fixed configuration switches are used for routing packets Figure 1 shows a diagram of a generic two stage load balanced switch architecture The first switch connects the first stage of input linecards to the center stage of intermediate input linecards and the second switch connects the center stage of intermediate input linecards to the final stage of output linecards As shown in 4 this class of architectures appears to be a practical way to scale Internet routers to very high capacities and line rates The scalability of this class of architectures can be attributed to two key aspects First they do not require a scheduler Second these architectures are built using two identical stages of fixed configuration switches whose deterministic interconnection patterns are independent of packet arrival Thus there is no need for arbitrary per packet dynamic switch configuration which is extremely difficult to achieve at high speeds The use of fixed configuration switches are particularly amendable to scalable implementations with optics as exemplified by the 100 Tb s reference design described in 4 This reference design is based on a fixed hierarchical mesh of optical channels that interconnects N 640 linecards each operating at a rate of R 160 Gb s Although the load balanced routers described in 2 5 can achieve guaranteed throughput for all admissible traffic on a best effort basis they do not provide service guarantees required by network operators to support real time traffic bandwidth provisioning and various other critical traffic engineering tasks Linecards Linecards Linecards 1 1 1 2 2 2 Abstract Operators need routers to provide service guarantees such as



Access the best Study Guides, Lecture Notes and Practice Exams

Loading Unlocking...
Login

Join to view A Scalable Switch for Service Guarantees and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view A Scalable Switch for Service Guarantees and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?