MC-LAG: Configuration consistency check for multichassis link aggregation groups

Use configuration consistency checks, which are enabled by default, to find configuration-parameter inconsistencies between multichassis link aggregation group (MC-LAG) peers. Severe inconsistencies prevent MC-LAG interfaces from coming up; the interfaces come up after you correct those inconsistencies. Moderate inconsistencies generate error messages, and you can optionally fix those inconsistencies. At each commit, the configuration on each MC-LAG peer is checked. Use show multichassis configuration-consistency list-of-parameters to view which parameters are checked and which parameters must be configured identically or uniquely across MC-LAG peers. Use show multichassis configuration-consistency redundancy-group-id redundancy-group-id (global | icl | mc-ae-id mc-ae-id) to see the consistency status for a given mc-ae ID.