if_mpadm(1M)						  System Administration Commands					      if_mpadm(1M)

NAME

       if_mpadm - administer interfaces in an IP multipathing group

SYNOPSIS

       if_mpadm -d | -r ifname

DESCRIPTION

       The  if_mpadm  utility  administers IP interfaces that are part of an IP Multipathing (IPMP) group. Currently, administration is limited to
       offlining IP interfaces and undoing previous offline operations.

       When an IP interface is taken offline, all IP data traffic that was flowing over the IP interface is moved to another IP interface  in  the
       IPMP group. In addition, all UP IP addresses hosted on the IP interface are brought down, causing in.mpathd(1M) to stop probe-based failure
       detection on the IP interface. As a result, an offline IP interface will not be used for any inbound or outbound IP traffic. Only IP inter-
       faces  that  are in an IPMP group may be brought offline. If the IP interface is the last functioning interface in the IPMP group, the off-
       line operation will fail.

       When an offline operation is undone, any IP addresses hosted on that IP interface are brought UP and will be considered	by  in.mpathd  for
       probe-based  failure  detection.  In  addition, provided the IP interface is otherwise active (see in.mpathd(1M)), it will again be used to
       send and receive IP data traffic for the IPMP group. Note that not all offline operations can be undone. For instance, in.mpathd  may  have
       offlined  an  IP interface because its hardware address was not unique within its IPMP group. The ipmpstat utility can be used to determine
       why an IP interface is offline, identify which IP interfaces in a group are being used for inbound and outbound IP traffic, and	more;  see
       ipmpstat(1M).

OPTIONS

       The if_mpadm utility supports the following options:

       -d ifname    Offline  the IP interface specified by ifname. If ifname is not in an IPMP group, or the offline would cause the IPMP group to
		    lose network connectivity, the operation will fail.

       -r ifname    Undo a previous offline of the IP interface specified by ifname. If ifname is not offline, the operation will fail.

EXAMPLES

       Example 1 Offlining an IP Interface

       The following command offlines the IP interface under0, causing any IP packets that were being sent and received through it to  be  handled
       by another IP interface in its group.

	 example% if_mpadm -d under0

       Example 2 Undoing a Previous Offline Operation

       Use the following command to undo the operation in the previous example:

	 example% if_mpdadm -r under0

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Unstable			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       ifconfig(1M), in.mpathd(1M), ipmpstat(1M), attributes(5)

DIAGNOSTICS

       cannot offline: no other functioning interfaces are in its IPMP group.
	   Description:

	   This message means that offlining the IP interface would leave the IPMP group without network connectivity.

       cannot offline: not a physical interface or not in an IPMP group
	   Description:

	   This means that the IP interface is not an underlying interface in an IPMP group, and therefore is not eligible to be offlined.

SunOS 5.11							    5 Jan 2009							      if_mpadm(1M)