Which default LDP parameter are you able to change with CLI?

The keepalive factor is the ratio of the LDP session hold time to the keepalive interval. This can be modified by changing the keepalive timer value via the CLI. While other LDP operational modes like label retention and control mode are also configurable, the keepalive factor is a specific numerical session parameter directly related to session health monitoring. On Nokia SR OS, configuring the keepalive-time under LDP session parameters effectively changes this factor, as the hold time is typically advertised as a multiple (default of 3) of the keepalive time.

A. Label space mode is a fundamental router characteristic (per-platform on Nokia SR OS) and not a configurable LDP session parameter.
B. Label retention (liberal/conservative) is a configurable mode of operation, but the question distinguishes between operational modes and numerical timer parameters.
C. Control mode (ordered/independent) is also a configurable mode of operation, not a simple numerical parameter like a keepalive factor.

1. Nokia 7450 ESS, 7750 SR, 7950 XRS, and VSR MPLS Guide, Release 22.10.R1, Section: LDP Configuration Overview, Subsection: LDP Session Parameters. (Describes configuration of keepalive-time).

2. RFC 5036, "LDP Specification", Section 2.5.2, "Hello Message". (Defines the Hold Time parameter used in keepalive negotiation).