SR-TE Traffic Steering

C.

Segment Routing Traffic Engineering (SR-TE) is a technology used in IP networks that enables traffic engineering with segment routing. SR-TE allows network operators to steer traffic through the network by leveraging segment routing and specifying explicit paths for traffic flows.

To steer traffic through the network, SR-TE uses explicit paths defined by network operators. These explicit paths can be predefined or dynamically calculated based on network conditions. SR-TE can use various mechanisms to define explicit paths, including dynamic rules, path policies, and explicit maps.

Option A, the shortest path calculated by the IGP, is not the method used by SR-TE to steer traffic through the network. While the IGP may provide the shortest path to a destination, SR-TE allows network operators to define specific paths to steer traffic in ways that are more beneficial for the network.

Option B, dynamic rules, can be used to define explicit paths in SR-TE. Dynamic rules allow network operators to define paths based on current network conditions, such as link or node failures or congestion levels.

Option C, path policy, can also be used to define explicit paths in SR-TE. Path policies allow network operators to define rules for traffic flows, such as prioritizing certain types of traffic or avoiding certain paths in the network.

Option D, explicit maps, are another way to define explicit paths in SR-TE. Explicit maps allow network operators to specify the exact path that traffic should take through the network, including intermediate nodes and links.

In summary, SR-TE uses explicit paths defined by network operators to steer traffic through the network. These explicit paths can be predefined or dynamically calculated based on network conditions, and can be defined using mechanisms such as dynamic rules, path policies, or explicit maps.