The Motivation Behind the New Command-Line Interface
With multiple address families, it was quickly realized that the AF topologies would frequently be noncongruent. Also, policies associated with a given session might vary depending on specific AFs. The initial CLI design focused on accommodating only a single AF (IPv4) and its associated sub-AFs (unicast and multicast). Utilizing this design to provide support for additional AFs introduced unnecessary management and policy expression complexities.
It was therefore decided that a new approach would be used—an approach that cleanly separates general session-related parameters from AF-specific parameters. Beyond management aspects alone, this new approach provides several advantages:
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