Symptom
1. When non-ISIS protocol routes were redistributed into ISIS protocol, the option to specify levels "was present". It was incorrect and has been removed now.
Router(config-router)#redistribute static ip ? << level option for non-ISIS source protocol
level-1 IS-IS level-1 routes only
level-1-2 IS-IS level-1 and level-2 routes
level-2 IS-IS level-2 routes only
metric Metric for redistributed routes
metric-type OSPF/IS-IS exterior metric type for redistributed routes
route-map Route map reference
2. When one ISIS instance was redistributed into another ISIS instance, the option to specify levels "was not present" and has been made available now.
Router(config-router)#redistribute isis 99 ip ? << No level option for IS-IS source protocol
metric Metric for redistributed routes
metric-type OSPF/IS-IS exterior metric type for redistributed routes
route-map Route map reference
Further Problem Description
The CLI options and behavior have been corrected.
1. Options for level NOT available when redistributing non-ISIS protocol into ISIS protocol
R1(config-router)#redistribute bgp 56 ip ?
metric Metric for redistributed routes
metric-type OSPF/IS-IS exterior metric type for redistributed routes
route-map Route map reference
2. Options for level available when redistributing one ISIS instance into another ISIS instance
R1(config-router)#redistribute isis 2 ip ?
level-1 IS-IS level-1 routes only
level-1-2 IS-IS level-1 and level-2 routes
level-2 IS-IS level-2 routes only
metric Metric for redistributed routes
metric-type OSPF/IS-IS exterior metric type for redistributed routes
route-map Route map reference