Valiant Load-Balancing in Backbone Networks

1
Valiant Load-Balancing in Backbone Networks

• Rui Zhang-Shen
• rzhang_at_stanford.edu

MSE 319 Feb 6, 2006
2
Backbone Networks Observations

• A few tens of core nodes,
• Each aggregating traffic for a region,
• Interconnected by an increasingly rich mesh of
  long-haul optical trunks
• Robustness
• Load-balancing
• Low utilizationlinks over-provisioned for
• Uncertainty of traffic matrix the network is
  designed for
• Headroom for future growth
• Prepare to take over when links or routers fail
• Minimize congestion and delay variation
• Efficiency sacrificed for robustness and
  flexibility

3
Our Approach

• Assume we know or estimate the traffic entering
  and leaving each Regional Network
• Requires only local knowledge of users and market
  estimates
• Connect regional nodes by a logical full-mesh
• Use Valiant Load Balancing (VLB) over whole
  network
• Can support all traffic matrices
• Efficient use of capacity

4
Valiant Load-Balancing
2r/N
r
1
2
r
2
4
3
N

4
r
r