Perhaps I'm just doing something wrong, but aggregate device MTU is failing to 
persist across reboot.

How to repeat
# /sbin/dladm create-aggr -L active -l e1000g0 -l e1000g1 -l e1000g2 -l e1000g3 
1
# /sbin/dladm show-linkprop -p mtu                                              
 
LINK         PROPERTY        VALUE          DEFAULT        POSSIBLE
e1000g0      mtu             9000           1500           -- 
e1000g1      mtu             9000           1500           -- 
e1000g2      mtu             9000           1500           -- 
e1000g3      mtu             9000           1500           -- 
aggr1        mtu             9000           1500           -- 

# init 6

#/sbin/dladm show-linkprop -p mtu
LINK         PROPERTY        VALUE          DEFAULT        POSSIBLE
e1000g0      mtu             9000           1500           -- 
e1000g1      mtu             9000           1500           -- 
e1000g2      mtu             9000           1500           -- 
e1000g3      mtu             9000           1500           -- 
aggr1        mtu             1500           1500           -- 

---

If I delete and re-create the device, the MTU resets to 9000 until the next 
reboot.

Is there something I'm missing, to get the jumbo MTU to persist?
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