How to failover IPMP online without up/down port?

Hi everyone,

Currently I'm using IPMP config with 2 interfaces like this.

# ipmpstat -g

GROUP    GROUPNAME  STATE   FDT    INTERFACES

ipmp0    ipmp0    ok    --    net9 (net13)

# ipmpstat -i

INTERFACE  ACTIVE GROUP    FLAGS   LINK   PROBE   STATE

net9    yes   ipmp0    --mbM--  up    disabled ok

net13    no   ipmp0    is-----  up    disabled ok

I wanna change net13 to active state without changing net9 state to offline.

If I use command if_mpadm to failover net9 (currently active) will failback, so it won't help:

#if_mpadm -d net9

# ipmpstat -g

GROUP    GROUPNAME  STATE   FDT    INTERFACES

ipmp0    ipmp0    degraded --    net13 [net9]

#if_mpadm -r net9

# ipmpstat -g