This KB provides the information related to the maximum number of MPLS labels supported by ACX series routers.

We may get the following PFE Error on the node.

%PFE-3: feb0 PFE_ERROR_NOT_FOUND: NH: Failed to find nh (1049104) for deletion

%PFE-3: feb0 PFE_ERROR_NOT_FOUND: NH: Failed to find nh (1048907) for deletion

%PFE-3: feb0 PFE_ERROR_FAIL_OPERATION: Failed to initialize generic failure

%PFE-3: feb0 PFE_ERROR_FAIL_OPERATION: Params Initialization Failed generic failure nh-id:1690

%feb0 PFE_ERROR_FAIL_OPERATION: Params Initialization Failed generic failure nh-id:1331

On ACX1000, ACX1100, ACX2000, ACX2100, ACX2200, ACX4000, ACX5048, and ACX5096 line of routers, the maximum label stack support is three labels (one VPN label and three transport labels).

On ACX5448 line of routers, the maximum label stack support is 5 labels (one VPN label and four transport labels).