Traffic Engineering

Question 1

2 Things that need to be measured

Answer 1

1. Topology: manually entered by network admin

2. Traffic: measured with simple counters

Question 2

2 ways control is implemented

Answer 2

1. Adding link weights

2. SDN

Question 3

In inter-AS multipath, what properties of the paths need to be equal in order to allow multipath over those paths?

Answer 3

1. LOCAL_PREF
2. AS_PATH length
3. MULTI_EXIT_DISC

Question 4

3 Goals of TE

Answer 4

1. Predictable
2. Limit influence of neighbors
3. Reduce overhead of routing changes

Question 5

What does fabric manager do?

Answer 5

It takes the AMAC response from an ARP query (a host giving its IP-> AMAC response), and the FM translates that AMAC to a PMAC.

Question 6

2 goals of valiant load balancing

Answer 6

1. Spread Traffic Evenly across the servers

2. Traffic load balanced INDEPENDENTLY of location

Question 7

Picking a random “indirection” host to take the traffic is an example of what?

Answer 7

Valiant Load Balancing