Hi,

I'm not sure whether is this bug, but while playing with IPMP i found this:
-bash-3.00# ifconfig -a
[..]
iprb0: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
        inet 10.99.1.41 netmask ffffff00 broadcast 10.99.1.255
        groupname PROD
        ether 0:2:b3:11:de:dd
iprb0:1: 
flags=9040843<UP,BROADCAST,RUNNING,MULTICAST,DEPRECATED,IPv4,NOFAILOVER> mtu 
1500 index 2
        inet 10.99.1.81 netmask ffffff00 broadcast 10.99.1.255
iprb0:2: flags=1000842<BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
        inet 0.0.0.0 netmask 0
iprb0:3: flags=9040842<BROADCAST,RUNNING,MULTICAST,DEPRECATED,IPv4,NOFAILOVER> 
mtu 1500 index 2
        inet 10.99.1.81 netmask ffffff00 broadcast 10.99.1.255
[..]

 svcadm restart network/physical
And after restarting networking:
-bash-3.00# ifconfig -a
[..]
iprb0: flags=1000843<UP,BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
        inet 10.99.1.41 netmask ffffff00 broadcast 10.99.1.255
        groupname PROD
        ether 0:2:b3:11:de:dd
iprb0:1: 
flags=9040843<UP,BROADCAST,RUNNING,MULTICAST,DEPRECATED,IPv4,NOFAILOVER> mtu 
1500 index 2
        inet 10.99.1.81 netmask ffffff00 broadcast 10.99.1.255
iprb0:2: flags=1000842<BROADCAST,RUNNING,MULTICAST,IPv4> mtu 1500 index 2
        inet 0.0.0.0 netmask 0
iprb0:3: flags=9040842<BROADCAST,RUNNING,MULTICAST,DEPRECATED,IPv4,NOFAILOVER> 
mtu 1500 index 2
        inet 10.99.1.81 netmask ffffff00 broadcast 10.99.1.255
iprb0:4: flags=9040842<BROADCAST,RUNNING,MULTICAST,DEPRECATED,IPv4,NOFAILOVER> 
mtu 1500 index 2
        inet 10.99.1.81 netmask ffffff00 broadcast 10.99.1.255
[..]

so after restarting network/physical SMF always adds additonal logical 
interfaces (addif in /etc/hostname.<if> as mentioned in Sun Network Services 
Guide ) 

-bash-3.00# cat /etc/release
                        Solaris 10 11/06 s10x_u3wos_10 X86
           Copyright 2006 Sun Microsystems, Inc.  All Rights Reserved.
                        Use is subject to license terms.
                           Assembled 14 November 2006

Dmesg:
Aug  3 11:22:10 oracle1 in.mpathd[447]: [ID 562805 daemon.error] Test address 
10.99.1.81 is not unique; disabling probe-based failure detection
 
 
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