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NetBSD 6.1.5 - man page for agr (netbsd section 4)

AGR(4)				   BSD Kernel Interfaces Manual 			   AGR(4)

     agr -- link aggregation pseudo network interface driver

     pseudo-device agr

     The agr driver provides link aggregation functionality (a.k.a. L2 trunking or bonding).

     It supports the IEEE 802.3ad Link Aggregation Control Protocol (LACP) and the Marker Proto-

     The agr driver supports the following link specific flags for ifconfig(8):

     link0   Use the round-robin distribution algorithm.  Don't use it unless you're really sure,
	     because it violates the frame ordering rule.

     -link0  Use the default distribution algorithm, which is based on the hash of DA/SA, TCI,
	     and, if available, some upper layer protocol information like ip(4) DA/SA.

     link1   Disable LACP.  Prevents any LACP or Marker messaging which leaves the ports in the
	     default static configuration.  Set this prior to adding ports.

     Create an agr interface, agr0, and attach re0 and re1 to it.  In other words, aggregate re0
     and re1 so that they can be used as a single interface, agr0.  The physical interfaces which
     are attached to the agr interface must not have any IP addresses, neither IPv4 nor IPv6.

		   ifconfig re0 inet xxx.xxx.xxx.xxx delete
		   ifconfig re0 inet6 fe80::xxxx:xxxx:xxxx:xxxx delete
		   ifconfig re1 inet xxx.xxx.xxx.xxx delete
		   ifconfig re1 inet6 fe80::xxxx:xxxx:xxxx:xxxx delete

		   ifconfig agr0 create
		   ifconfig agr0 agrport re0
		   ifconfig agr0 agrport re1

     Destroy an interface created in the above example.

		   ifconfig agr0 -agrport re0
		   ifconfig agr0 -agrport re1
		   ifconfig agr0 destroy


     IEEE 802.3ad Aggregation of Multiple Link Segments

     The agr driver first appeared in NetBSD 4.0.

     The agr driver was written by YAMAMOTO Takashi.

     There is no way to configure LACP administrative variables, including system and port prior-
     ities.  The current implementation of the agr driver always performs active-mode LACP and
     uses 0x8000 as system and port priorities.

     The agr driver uses the MAC address of the first-added physical interface as the MAC address
     of the agr interface itself.  Thus, removing the physical interface and using it for another
     purpose can result in non-unique MAC addresses.

     The current implementation of the agr driver doesn't prevent unsafe operations like some
     ioctls against underlying physical interfaces.  Such operations can result in unexpected
     behaviors, and are strongly discouraged.

     There is no way to configure agr interfaces without attaching physical interfaces.

     Physical interfaces being added to the agr interface shouldn't have any addresses except for
     link level address.  Otherwise, the attempt will fail with EBUSY.	Note that it includes an
     automatically assigned IPv6 link-local address.

BSD					February 23, 2010				      BSD

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