tmnxL2tpTgCfgMaxRetxEstab 1.3.6.1.4.1.6527.3.1.2.60.1.2.1.2.1.10

The value of tmnxL2tpTgCfgMaxRetxEstab specifies the number of retries allowed for established tunnels before their control connection goes down. The value '-2' is not allowed because this is the widest scope.