The value of tmnxMobGwSysGroupCardRedState indicates the state of this
card in the redundancy group. The state may be one of:
'notValid' - card is operationally down or the corresponding group has
no redundancy configured.
'active' - card is online and providing service.
'standby' - card is online and backing up an active card, but not
providing service.
'standbyInProg' - card is operationally up, but not in sync with the
active card.