a92c4bb62a
the failover protocol is supported due to limitations in the IPoIB architecture. Refer to the lagg(4) manual page for how to configure and use this new feature. A new network interface type, IFT_INFINIBANDLAG, has been added, similar to the existing IFT_IEEE8023ADLAG . ifconfig(8) has been updated to accept a new laggtype argument when creating lagg(4) network interfaces. This new argument is used to distinguish between ethernet and infiniband type of lagg(4) network interface. The laggtype argument is optional and defaults to ethernet. The lagg(4) command line syntax is backwards compatible. Differential Revision: https://reviews.freebsd.org/D26254 Reviewed by: melifaro@ MFC after: 1 week Sponsored by: Mellanox Technologies // NVIDIA Networking
230 lines
6.9 KiB
Groff
230 lines
6.9 KiB
Groff
.\" $OpenBSD: trunk.4,v 1.18 2006/06/09 13:53:34 jmc Exp $
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.\"
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.\" Copyright (c) 2005, 2006 Reyk Floeter <reyk@openbsd.org>
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.\"
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.\" Permission to use, copy, modify, and distribute this software for any
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.\" purpose with or without fee is hereby granted, provided that the above
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.\" copyright notice and this permission notice appear in all copies.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd October 21, 2020
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.Dt LAGG 4
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.Os
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.Sh NAME
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.Nm lagg
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.Nd link aggregation and link failover interface
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.Sh SYNOPSIS
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To compile this driver into the kernel,
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place the following line in your
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kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device lagg"
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.Ed
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.Pp
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Alternatively, to load the driver as a
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module at boot time, place the following line in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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if_lagg_load="YES"
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.Ed
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.Sh DESCRIPTION
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The
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.Nm
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interface allows aggregation of multiple network interfaces as one virtual
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.Nm
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interface for the purpose of providing fault-tolerance and high-speed links.
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.Pp
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A
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.Nm
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interface can be created using the
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.Ic ifconfig lagg Ns Ar N Ic create
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command.
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It can use different link aggregation protocols specified
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using the
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.Ic laggproto Ar proto
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option.
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Child interfaces can be added using the
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.Ic laggport Ar child-iface
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option and removed using the
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.Ic -laggport Ar child-iface
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option.
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.Pp
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The driver currently supports the aggregation protocols
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.Ic failover
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(the default),
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.Ic lacp ,
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.Ic loadbalance ,
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.Ic roundrobin ,
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.Ic broadcast ,
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and
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.Ic none .
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The protocols determine which ports are used for outgoing traffic
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and whether a specific port accepts incoming traffic.
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The interface link state is used to validate if the port is active or
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not.
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.Bl -tag -width loadbalance
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.It Ic failover
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Sends traffic only through the active port.
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If the master port becomes unavailable,
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the next active port is used.
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The first interface added is the master port;
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any interfaces added after that are used as failover devices.
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.Pp
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By default, received traffic is only accepted when they are received
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through the active port.
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This constraint can be relaxed by setting the
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.Va net.link.lagg.failover_rx_all
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.Xr sysctl 8
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variable to a nonzero value,
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which is useful for certain bridged network setups.
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.It Ic lacp
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Supports the IEEE 802.1AX (formerly 802.3ad) Link Aggregation Control Protocol
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(LACP) and the Marker Protocol.
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LACP will negotiate a set of aggregable links with the peer in to one or more
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Link Aggregated Groups.
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Each LAG is composed of ports of the same speed, set to full-duplex operation.
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The traffic will be balanced across the ports in the LAG with the greatest
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total speed, in most cases there will only be one LAG which contains all ports.
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In the event of changes in physical connectivity, Link Aggregation will quickly
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converge to a new configuration.
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.It Ic loadbalance
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Balances outgoing traffic across the active ports based on hashed
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protocol header information and accepts incoming traffic from
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any active port.
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This is a static setup and does not negotiate aggregation with the peer or
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exchange frames to monitor the link.
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The hash includes the Ethernet source and destination address, and, if
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available, the VLAN tag, and the IP source and destination address.
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.It Ic roundrobin
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Distributes outgoing traffic using a round-robin scheduler
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through all active ports and accepts incoming traffic from
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any active port.
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Using
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.Ic roundrobin
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mode can cause unordered packet arrival at the client.
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Throughput might be limited as the client performs CPU-intensive packet
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reordering.
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.It Ic broadcast
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Sends frames to all ports of the LAG and receives frames on
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any port of the LAG.
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.It Ic none
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This protocol is intended to do nothing: it disables any traffic without
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disabling the
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.Nm
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interface itself.
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.El
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.Pp
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Each
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.Nm
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interface is created at runtime using interface cloning.
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This is
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most easily done with the
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.Xr ifconfig 8
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.Cm create
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command or using the
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.Va cloned_interfaces
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variable in
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.Xr rc.conf 5 .
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.Pp
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The MTU of the first interface to be added is used as the lagg MTU.
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All additional interfaces are required to have exactly the same value.
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.Pp
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The
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.Ic loadbalance
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and
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.Ic lacp
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modes will use the RSS hash from the network card if available to avoid
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computing one, this may give poor traffic distribution if the hash is invalid
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or uses less of the protocol header information.
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Local hash computation can be forced per interface by setting the
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.Cm -use_flowid
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.Xr ifconfig 8
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flag.
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The default for new interfaces is set via the
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.Va net.link.lagg.default_use_flowid
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.Xr sysctl 8 .
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.Sh EXAMPLES
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Create a link aggregation using LACP with two
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.Xr bge 4
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Gigabit Ethernet interfaces:
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.Bd -literal -offset indent
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# ifconfig bge0 up
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# ifconfig bge1 up
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# ifconfig lagg0 create
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# ifconfig lagg0 laggproto lacp laggport bge0 laggport bge1 \e
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192.168.1.1 netmask 255.255.255.0
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.Ed
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.Pp
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Create a link aggregation using ROUNDROBIN with two
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.Xr bge 4
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Gigabit Ethernet interfaces and set a stride of 500 packets
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per interface:
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.Bd -literal -offset indent
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# ifconfig bge0 up
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# ifconfig bge1 up
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# ifconfig lagg0 create
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# ifconfig lagg0 laggproto roundrobin laggport bge0 laggport bge1 \e
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192.168.1.1 netmask 255.255.255.0
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# ifconfig lagg0 rr_limit 500
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.Ed
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.Pp
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The following example uses an active failover interface to set up roaming
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between wired and wireless networks using two network devices.
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Whenever the wired master interface is unplugged, the wireless failover
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device will be used:
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.Bd -literal -offset indent
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# ifconfig em0 up
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# ifconfig ath0 ether 00:11:22:33:44:55
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# ifconfig create wlan0 wlandev ath0 ssid my_net up
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# ifconfig lagg0 create
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# ifconfig lagg0 laggproto failover laggport em0 laggport wlan0 \e
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192.168.1.1 netmask 255.255.255.0
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.Ed
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.Pp
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(Note the mac address of the wireless device is forced to match the wired
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device as a workaround.)
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.Pp
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The following example shows how to create an infiniband failover interface.
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.Bd -literal -offset indent
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# ifconfig ib0 up
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# ifconfig ib1 up
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# ifconfig lagg0 create laggtype infiniband
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# ifconfig lagg0 laggproto failover laggport ib0 laggport ib1 \e
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1.1.1.1 netmask 255.255.255.0
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.Ed
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.Sh SEE ALSO
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.Xr ng_one2many 4 ,
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.Xr ifconfig 8 ,
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.Xr sysctl 8
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.Sh HISTORY
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The
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.Nm
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device first appeared in
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.Fx 6.3 .
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.Sh AUTHORS
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.An -nosplit
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The
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.Nm
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driver was written under the name
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.Nm trunk
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by
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.An Reyk Floeter Aq Mt reyk@openbsd.org .
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The LACP implementation was written by
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.An YAMAMOTO Takashi
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for
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.Nx .
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.Sh BUGS
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There is no way to configure LACP administrative variables, including system
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and port priorities.
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The current implementation always performs active-mode LACP and uses 0x8000 as
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system and port priorities.
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