agr(4) - NetBSD Manual Pages

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AGR(4)                  NetBSD 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 trunk- ing or bonding). It supports the IEEE 802.3ad Link Aggregation Control Protocol (LACP) and the Marker Protocol. 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.
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 inter- face, agr0) 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.
The current implementation of the agr driver always attempts automatic configuration via LACP. There is no way to configure statically or use non IEEE 802.3 devices. There is no way to configure LACP administrative variables, including system and port priorities. The current implementation of the agr driver always performs active-mode LACP and uses 0x8000 as system and port pri- orities. 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 phys- ical 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 oper- ations like some ioctls against underlying physical interfaces. Such operations can result in unexpected behaviours, and are strongly discour- aged. 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. NetBSD 4.0 Nov 5, 2007 NetBSD 4.0
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