PVC Source Redirect State:
'backupinactive(1)' - backup is not configured and/or cross-net status
is inactive; will allow traffic only through primary.
'primaryactive(2)' - both primary and backup rx'ed 'active' cross-net
status, currently primary is active and traffic only
through primary.
'switchtobackup(3)' - primary cross-net status is inactive, but can
not switch to backup due to manual (or semi-manual)
operation of the redirect; will allow traffic only
through primary.
'backupactive(12)' - cross-net status is 'inactive' for primary;
will allow traffic only through backup.
'switchtoprimary(13)' - cross-net status is 'active' for primary,
should by can not switch to primary due to manual
(or semi-manual) operation of the redirect; will
allow traffic only through backup.
'holddown(21)' - down state used as intermediate state at switching time
(for not more then a second); all traffic is dropped.