Hello, 

I found on snv134 that the link permissions of the property "mtu" are not 
updated, even if they are writable
---
r...@nexenta3:/volumes# dladm show-linkprop e1000g0
LINK         PROPERTY        PERM VALUE          DEFAULT        POSSIBLE
...
e1000g0      mtu             r-   9000           1500           1500-9216
...

r...@nexenta3:/volumes# dladm set-linkprop -p mtu=4000 e1000g0
dladm: warning: cannot set link property 'mtu' on 'e1000g0': link busy
r...@nexenta3:/volumes# ifconfig e1000g0 down
r...@nexenta3:/volumes# dladm set-linkprop -p mtu=4000 e1000g0
dladm: warning: cannot set link property 'mtu' on 'e1000g0': link busy
r...@nexenta3:/volumes# ifconfig e1000g0 unplumb
r...@nexenta3:/volumes# dladm set-linkprop -p mtu=4000 e1000g0
r...@nexenta3:/volumes# dladm show-linkprop e1000g0
LINK         PROPERTY        PERM VALUE          DEFAULT        POSSIBLE
...
e1000g0      mtu             r-   4000           1500           1500-9216
...
r...@nexenta3:/volumes# ifconfig e1000g0 plumb
r...@nexenta3:/volumes# ifconfig e1000g0
e1000g0: flags=1000842<BROADCAST,RUNNING,MULTICAST,IPv4> mtu 9000 index 19
        inet 0.0.0.0 netmask 0
        ether 0:15:17:cc:f2:ef

                
Hardware is:  
  Ethernet controller: Intel Corporation 82571EB Gigabit Ethernet Controller 
(Copper)
  PCI ID: 8086:10bc (rev 06)
--- 

Any hints ? Is this a Bug ? Where to track this ? 

Regards, 
Robert
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