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[DOC] Update bonding documentation with sysfs info 

Bonding documentation needed an update to include sysfs specific
information. This patch adds information on how to change bonding
parameters at runtime using the sysfs interface.
Signed-off-by: default avatarMitch Williams <mitch.a.williams@intel.com>
Signed-off-by: default avatarAuke Kok <auke-jan.h.kok@intel.com>
parent 9026729b
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Documentation/networking/bonding.txt
View file @ 6224e01d
Linux Ethernet Bonding Driver HOWTO
Latest update: 21 June 2005
Latest update: 24 April 2006
Initial release : Thomas Davis <tadavis at lbl.gov>
Corrections, HA extensions : 2000/10/03-15 :
......@@ -12,6 +12,8 @@ Corrections, HA extensions : 2000/10/03-15 :
- Jay Vosburgh <fubar at us dot ibm dot com>
Reorganized and updated Feb 2005 by Jay Vosburgh
Added Sysfs information: 2006/04/24
- Mitch Williams <mitch.a.williams at intel.com>
Introduction
============
......@@ -38,61 +40,62 @@ Table of Contents
2. Bonding Driver Options
3. Configuring Bonding Devices
3.1 Configuration with sysconfig support
3.1.1 Using DHCP with sysconfig
3.1.2 Configuring Multiple Bonds with sysconfig
3.2 Configuration with initscripts support
3.2.1 Using DHCP with initscripts
3.2.2 Configuring Multiple Bonds with initscripts
3.3 Configuring Bonding Manually
3.1 Configuration with Sysconfig Support
3.1.1 Using DHCP with Sysconfig
3.1.2 Configuring Multiple Bonds with Sysconfig
3.2 Configuration with Initscripts Support
3.2.1 Using DHCP with Initscripts
3.2.2 Configuring Multiple Bonds with Initscripts
3.3 Configuring Bonding Manually with Ifenslave
3.3.1 Configuring Multiple Bonds Manually
3.4 Configuring Bonding Manually via Sysfs
5. Querying Bonding Configuration
5.1 Bonding Configuration
5.2 Network Configuration
4. Querying Bonding Configuration
4.1 Bonding Configuration
4.2 Network Configuration
6. Switch Configuration
5. Switch Configuration
7. 802.1q VLAN Support
6. 802.1q VLAN Support
8. Link Monitoring
8.1 ARP Monitor Operation
8.2 Configuring Multiple ARP Targets
8.3 MII Monitor Operation
7. Link Monitoring
7.1 ARP Monitor Operation
7.2 Configuring Multiple ARP Targets
7.3 MII Monitor Operation
9. Potential Trouble Sources
9.1 Adventures in Routing
9.2 Ethernet Device Renaming
9.3 Painfully Slow Or No Failed Link Detection By Miimon
8. Potential Trouble Sources
8.1 Adventures in Routing
8.2 Ethernet Device Renaming
8.3 Painfully Slow Or No Failed Link Detection By Miimon
10. SNMP agents
9. SNMP agents
11. Promiscuous mode
10. Promiscuous mode
12. Configuring Bonding for High Availability
12.1 High Availability in a Single Switch Topology
12.2 High Availability in a Multiple Switch Topology
12.2.1 HA Bonding Mode Selection for Multiple Switch Topology
12.2.2 HA Link Monitoring for Multiple Switch Topology
11. Configuring Bonding for High Availability
11.1 High Availability in a Single Switch Topology
11.2 High Availability in a Multiple Switch Topology
11.2.1 HA Bonding Mode Selection for Multiple Switch Topology
11.2.2 HA Link Monitoring for Multiple Switch Topology
13. Configuring Bonding for Maximum Throughput
13.1 Maximum Throughput in a Single Switch Topology
13.1.1 MT Bonding Mode Selection for Single Switch Topology
13.1.2 MT Link Monitoring for Single Switch Topology
13.2 Maximum Throughput in a Multiple Switch Topology
13.2.1 MT Bonding Mode Selection for Multiple Switch Topology
13.2.2 MT Link Monitoring for Multiple Switch Topology
12. Configuring Bonding for Maximum Throughput
12.1 Maximum Throughput in a Single Switch Topology
12.1.1 MT Bonding Mode Selection for Single Switch Topology
12.1.2 MT Link Monitoring for Single Switch Topology
12.2 Maximum Throughput in a Multiple Switch Topology
12.2.1 MT Bonding Mode Selection for Multiple Switch Topology
12.2.2 MT Link Monitoring for Multiple Switch Topology
14. Switch Behavior Issues
14.1 Link Establishment and Failover Delays
14.2 Duplicated Incoming Packets
13. Switch Behavior Issues
13.1 Link Establishment and Failover Delays
13.2 Duplicated Incoming Packets
15. Hardware Specific Considerations
15.1 IBM BladeCenter
14. Hardware Specific Considerations
14.1 IBM BladeCenter
16. Frequently Asked Questions
15. Frequently Asked Questions
17. Resources and Links
16. Resources and Links
1. Bonding Driver Installation
......@@ -156,6 +159,9 @@ you're trying to build it for. Some distros (e.g., Red Hat from 7.1
onwards) do not have /usr/include/linux symbolically linked to the
default kernel source include directory.
SECOND IMPORTANT NOTE:
If you plan to configure bonding using sysfs, you do not need
to use ifenslave.
2. Bonding Driver Options
=========================
......@@ -270,7 +276,7 @@ mode
In bonding version 2.6.2 or later, when a failover
occurs in active-backup mode, bonding will issue one
or more gratuitous ARPs on the newly active slave.
One gratutious ARP is issued for the bonding master
One gratuitous ARP is issued for the bonding master
interface and each VLAN interfaces configured above
it, provided that the interface has at least one IP
address configured. Gratuitous ARPs issued for VLAN
......@@ -377,7 +383,7 @@ mode
When a link is reconnected or a new slave joins the
bond the receive traffic is redistributed among all
active slaves in the bond by initiating ARP Replies
with the selected mac address to each of the
with the selected MAC address to each of the
clients. The updelay parameter (detailed below) must
be set to a value equal or greater than the switch's
forwarding delay so that the ARP Replies sent to the
......@@ -498,11 +504,12 @@ not exist, and the layer2 policy is the only policy.
3. Configuring Bonding Devices
==============================
There are, essentially, two methods for configuring bonding:
with support from the distro's network initialization scripts, and
without. Distros generally use one of two packages for the network
initialization scripts: initscripts or sysconfig. Recent versions of
these packages have support for bonding, while older versions do not.
You can configure bonding using either your distro's network
initialization scripts, or manually using either ifenslave or the
sysfs interface. Distros generally use one of two packages for the
network initialization scripts: initscripts or sysconfig. Recent
versions of these packages have support for bonding, while older
versions do not.
We will first describe the options for configuring bonding for
distros using versions of initscripts and sysconfig with full or
......@@ -530,7 +537,7 @@ $ grep ifenslave /sbin/ifup
If this returns any matches, then your initscripts or
sysconfig has support for bonding.
3.1 Configuration with sysconfig support
3.1 Configuration with Sysconfig Support
----------------------------------------
This section applies to distros using a version of sysconfig
......@@ -538,7 +545,7 @@ with bonding support, for example, SuSE Linux Enterprise Server 9.
SuSE SLES 9's networking configuration system does support
bonding, however, at this writing, the YaST system configuration
frontend does not provide any means to work with bonding devices.
front end does not provide any means to work with bonding devices.
Bonding devices can be managed by hand, however, as follows.
First, if they have not already been configured, configure the
......@@ -660,7 +667,7 @@ format can be found in an example ifcfg template file:
Note that the template does not document the various BONDING_
settings described above, but does describe many of the other options.
3.1.1 Using DHCP with sysconfig
3.1.1 Using DHCP with Sysconfig
-------------------------------
Under sysconfig, configuring a device with BOOTPROTO='dhcp'
......@@ -670,7 +677,7 @@ attempt to obtain the device address from DHCP prior to adding any of
the slave devices. Without active slaves, the DHCP requests are not
sent to the network.
3.1.2 Configuring Multiple Bonds with sysconfig
3.1.2 Configuring Multiple Bonds with Sysconfig
-----------------------------------------------
The sysconfig network initialization system is capable of
......@@ -685,7 +692,7 @@ ifcfg-bondX files.
options in the ifcfg-bondX file, it is not necessary to add them to
the system /etc/modules.conf or /etc/modprobe.conf configuration file.
3.2 Configuration with initscripts support
3.2 Configuration with Initscripts Support
------------------------------------------
This section applies to distros using a version of initscripts
......@@ -756,7 +763,7 @@ options for your configuration.
will restart the networking subsystem and your bond link should be now
up and running.
3.2.1 Using DHCP with initscripts
3.2.1 Using DHCP with Initscripts
---------------------------------
Recent versions of initscripts (the version supplied with
......@@ -768,7 +775,7 @@ above, except replace the line "BOOTPROTO=none" with "BOOTPROTO=dhcp"
and add a line consisting of "TYPE=Bonding". Note that the TYPE value
is case sensitive.
3.2.2 Configuring Multiple Bonds with initscripts
3.2.2 Configuring Multiple Bonds with Initscripts
-------------------------------------------------
At this writing, the initscripts package does not directly
......@@ -784,8 +791,8 @@ Fedora Core kernels, and has been seen on RHEL 4 as well. On kernels
exhibiting this problem, it will be impossible to configure multiple
bonds with differing parameters.
3.3 Configuring Bonding Manually
--------------------------------
3.3 Configuring Bonding Manually with Ifenslave
-----------------------------------------------
This section applies to distros whose network initialization
scripts (the sysconfig or initscripts package) do not have specific
......@@ -889,11 +896,139 @@ install bond1 /sbin/modprobe --ignore-install bonding -o bond1 \
This may be repeated any number of times, specifying a new and
unique name in place of bond1 for each subsequent instance.
3.4 Configuring Bonding Manually via Sysfs
------------------------------------------
Starting with version 3.0, Channel Bonding may be configured
via the sysfs interface. This interface allows dynamic configuration
of all bonds in the system without unloading the module. It also
allows for adding and removing bonds at runtime. Ifenslave is no
longer required, though it is still supported.
Use of the sysfs interface allows you to use multiple bonds
with different configurations without having to reload the module.
It also allows you to use multiple, differently configured bonds when
bonding is compiled into the kernel.
You must have the sysfs filesystem mounted to configure
bonding this way. The examples in this document assume that you
are using the standard mount point for sysfs, e.g. /sys. If your
sysfs filesystem is mounted elsewhere, you will need to adjust the
example paths accordingly.
Creating and Destroying Bonds
-----------------------------
To add a new bond foo:
# echo +foo > /sys/class/net/bonding_masters
To remove an existing bond bar:
# echo -bar > /sys/class/net/bonding_masters
To show all existing bonds:
# cat /sys/class/net/bonding_masters
NOTE: due to 4K size limitation of sysfs files, this list may be
truncated if you have more than a few hundred bonds. This is unlikely
to occur under normal operating conditions.
Adding and Removing Slaves
--------------------------
Interfaces may be enslaved to a bond using the file
/sys/class/net/<bond>/bonding/slaves. The semantics for this file
are the same as for the bonding_masters file.
To enslave interface eth0 to bond bond0:
# ifconfig bond0 up
# echo +eth0 > /sys/class/net/bond0/bonding/slaves
To free slave eth0 from bond bond0:
# echo -eth0 > /sys/class/net/bond0/bonding/slaves
NOTE: The bond must be up before slaves can be added. All
slaves are freed when the interface is brought down.
When an interface is enslaved to a bond, symlinks between the
two are created in the sysfs filesystem. In this case, you would get
/sys/class/net/bond0/slave_eth0 pointing to /sys/class/net/eth0, and
/sys/class/net/eth0/master pointing to /sys/class/net/bond0.
This means that you can tell quickly whether or not an
interface is enslaved by looking for the master symlink. Thus:
# echo -eth0 > /sys/class/net/eth0/master/bonding/slaves
will free eth0 from whatever bond it is enslaved to, regardless of
the name of the bond interface.
Changing a Bond's Configuration
-------------------------------
Each bond may be configured individually by manipulating the
files located in /sys/class/net/<bond name>/bonding
The names of these files correspond directly with the command-
line parameters described elsewhere in in this file, and, with the
exception of arp_ip_target, they accept the same values. To see the
current setting, simply cat the appropriate file.
A few examples will be given here; for specific usage
guidelines for each parameter, see the appropriate section in this
document.
To configure bond0 for balance-alb mode:
# ifconfig bond0 down
# echo 6 > /sys/class/net/bond0/bonding/mode
- or -
# echo balance-alb > /sys/class/net/bond0/bonding/mode
NOTE: The bond interface must be down before the mode can be
changed.
To enable MII monitoring on bond0 with a 1 second interval:
# echo 1000 > /sys/class/net/bond0/bonding/miimon
NOTE: If ARP monitoring is enabled, it will disabled when MII
monitoring is enabled, and vice-versa.
To add ARP targets:
# echo +192.168.0.100 > /sys/class/net/bond0/bonding/arp_ip_target
# echo +192.168.0.101 > /sys/class/net/bond0/bonding/arp_ip_target
NOTE: up to 10 target addresses may be specified.
To remove an ARP target:
# echo -192.168.0.100 > /sys/class/net/bond0/bonding/arp_ip_target
Example Configuration
---------------------
We begin with the same example that is shown in section 3.3,
executed with sysfs, and without using ifenslave.
To make a simple bond of two e100 devices (presumed to be eth0
and eth1), and have it persist across reboots, edit the appropriate
file (/etc/init.d/boot.local or /etc/rc.d/rc.local), and add the
following:
modprobe bonding
modprobe e100
echo balance-alb > /sys/class/net/bond0/bonding/mode
ifconfig bond0 192.168.1.1 netmask 255.255.255.0 up
echo 100 > /sys/class/net/bond0/bonding/miimon
echo +eth0 > /sys/class/net/bond0/bonding/slaves
echo +eth1 > /sys/class/net/bond0/bonding/slaves
To add a second bond, with two e1000 interfaces in
active-backup mode, using ARP monitoring, add the following lines to
your init script:
modprobe e1000
echo +bond1 > /sys/class/net/bonding_masters
echo active-backup > /sys/class/net/bond1/bonding/mode
ifconfig bond1 192.168.2.1 netmask 255.255.255.0 up
echo +192.168.2.100 /sys/class/net/bond1/bonding/arp_ip_target
echo 2000 > /sys/class/net/bond1/bonding/arp_interval
echo +eth2 > /sys/class/net/bond1/bonding/slaves
echo +eth3 > /sys/class/net/bond1/bonding/slaves
5. Querying Bonding Configuration
4. Querying Bonding Configuration
=================================
5.1 Bonding Configuration
4.1 Bonding Configuration
-------------------------
Each bonding device has a read-only file residing in the
......@@ -923,7 +1058,7 @@ generally as follows:
The precise format and contents will change depending upon the
bonding configuration, state, and version of the bonding driver.
5.2 Network configuration
4.2 Network configuration
-------------------------
The network configuration can be inspected using the ifconfig
......@@ -958,7 +1093,7 @@ eth1 Link encap:Ethernet HWaddr 00:C0:F0:1F:37:B4
collisions:0 txqueuelen:100
Interrupt:9 Base address:0x1400
6. Switch Configuration
5. Switch Configuration
=======================
For this section, "switch" refers to whatever system the
......@@ -991,7 +1126,7 @@ transmit policy for an EtherChannel group; all three will interoperate
with another EtherChannel group.
7. 802.1q VLAN Support
6. 802.1q VLAN Support
======================
It is possible to configure VLAN devices over a bond interface
......@@ -1042,7 +1177,7 @@ underlying device -- i.e. the bonding interface -- to promiscuous
mode, which might not be what you want.
8. Link Monitoring
7. Link Monitoring
==================
The bonding driver at present supports two schemes for
......@@ -1053,7 +1188,7 @@ monitor.
bonding driver itself, it is not possible to enable both ARP and MII
monitoring simultaneously.
8.1 ARP Monitor Operation
7.1 ARP Monitor Operation
-------------------------
The ARP monitor operates as its name suggests: it sends ARP
......@@ -1071,7 +1206,7 @@ those slaves will stay down. If networking monitoring (tcpdump, etc)
shows the ARP requests and replies on the network, then it may be that
your device driver is not updating last_rx and trans_start.
8.2 Configuring Multiple ARP Targets
7.2 Configuring Multiple ARP Targets
------------------------------------
While ARP monitoring can be done with just one target, it can
......@@ -1094,7 +1229,7 @@ alias bond0 bonding
options bond0 arp_interval=60 arp_ip_target=192.168.0.100
8.3 MII Monitor Operation
7.3 MII Monitor Operation
-------------------------
The MII monitor monitors only the carrier state of the local
......@@ -1120,14 +1255,14 @@ does not support or had some error in processing both the MII register
and ethtool requests), then the MII monitor will assume the link is
up.
9. Potential Sources of Trouble
8. Potential Sources of Trouble
===============================
9.1 Adventures in Routing
8.1 Adventures in Routing
-------------------------
When bonding is configured, it is important that the slave
devices not have routes that supercede routes of the master (or,
devices not have routes that supersede routes of the master (or,
generally, not have routes at all). For example, suppose the bonding
device bond0 has two slaves, eth0 and eth1, and the routing table is
as follows:
......@@ -1154,11 +1289,11 @@ by the state of the routing table.
The solution here is simply to insure that slaves do not have
routes of their own, and if for some reason they must, those routes do
not supercede routes of their master. This should generally be the
not supersede routes of their master. This should generally be the
case, but unusual configurations or errant manual or automatic static
route additions may cause trouble.
9.2 Ethernet Device Renaming
8.2 Ethernet Device Renaming
----------------------------
On systems with network configuration scripts that do not
......@@ -1207,7 +1342,7 @@ modprobe with --ignore-install to cause the normal action to then take
place. Full documentation on this can be found in the modprobe.conf
and modprobe manual pages.
9.3. Painfully Slow Or No Failed Link Detection By Miimon
8.3. Painfully Slow Or No Failed Link Detection By Miimon
---------------------------------------------------------
By default, bonding enables the use_carrier option, which
......@@ -1235,7 +1370,7 @@ carrier state. It has no way to determine the state of devices on or
beyond other ports of a switch, or if a switch is refusing to pass
traffic while still maintaining carrier on.
10. SNMP agents
9. SNMP agents
===============
If running SNMP agents, the bonding driver should be loaded
......@@ -1281,7 +1416,7 @@ ifDescr, the association between the IP address and IfIndex remains
and SNMP functions such as Interface_Scan_Next will report that
association.
11. Promiscuous mode
10. Promiscuous mode
====================
When running network monitoring tools, e.g., tcpdump, it is
......@@ -1308,7 +1443,7 @@ sending to peers that are unassigned or if the load is unbalanced.
the active slave changes (e.g., due to a link failure), the
promiscuous setting will be propagated to the new active slave.
12. Configuring Bonding for High Availability
11. Configuring Bonding for High Availability
=============================================
High Availability refers to configurations that provide
......@@ -1318,7 +1453,7 @@ goal is to provide the maximum availability of network connectivity
(i.e., the network always works), even though other configurations
could provide higher throughput.
12.1 High Availability in a Single Switch Topology
11.1 High Availability in a Single Switch Topology
--------------------------------------------------
If two hosts (or a host and a single switch) are directly
......@@ -1332,7 +1467,7 @@ the load will be rebalanced across the remaining devices.
See Section 13, "Configuring Bonding for Maximum Throughput"
for information on configuring bonding with one peer device.
12.2 High Availability in a Multiple Switch Topology
11.2 High Availability in a Multiple Switch Topology
----------------------------------------------------
With multiple switches, the configuration of bonding and the
......@@ -1359,7 +1494,7 @@ switches (ISL, or inter switch link), and multiple ports connecting to
the outside world ("port3" on each switch). There is no technical
reason that this could not be extended to a third switch.
12.2.1 HA Bonding Mode Selection for Multiple Switch Topology
11.2.1 HA Bonding Mode Selection for Multiple Switch Topology
-------------------------------------------------------------
In a topology such as the example above, the active-backup and
......@@ -1381,7 +1516,7 @@ broadcast: This mode is really a special purpose mode, and is suitable
necessary for some specific one-way traffic to reach both
independent networks, then the broadcast mode may be suitable.
12.2.2 HA Link Monitoring Selection for Multiple Switch Topology
11.2.2 HA Link Monitoring Selection for Multiple Switch Topology
----------------------------------------------------------------
The choice of link monitoring ultimately depends upon your
......@@ -1402,10 +1537,10 @@ regardless of which switch is active, the ARP monitor has a suitable
target to query.
13. Configuring Bonding for Maximum Throughput
12. Configuring Bonding for Maximum Throughput
==============================================
13.1 Maximizing Throughput in a Single Switch Topology
12.1 Maximizing Throughput in a Single Switch Topology
------------------------------------------------------
In a single switch configuration, the best method to maximize
......@@ -1476,7 +1611,7 @@ destination to make load balancing decisions. The behavior of each
mode is described below.
13.1.1 MT Bonding Mode Selection for Single Switch Topology
12.1.1 MT Bonding Mode Selection for Single Switch Topology
-----------------------------------------------------------
This configuration is the easiest to set up and to understand,
......@@ -1607,7 +1742,7 @@ balance-alb: This mode is everything that balance-tlb is, and more.
device driver must support changing the hardware address while
the device is open.
13.1.2 MT Link Monitoring for Single Switch Topology
12.1.2 MT Link Monitoring for Single Switch Topology
----------------------------------------------------
The choice of link monitoring may largely depend upon which
......@@ -1616,7 +1751,7 @@ support the use of the ARP monitor, and are thus restricted to using
the MII monitor (which does not provide as high a level of end to end
assurance as the ARP monitor).
13.2 Maximum Throughput in a Multiple Switch Topology
12.2 Maximum Throughput in a Multiple Switch Topology
-----------------------------------------------------
Multiple switches may be utilized to optimize for throughput
......@@ -1651,7 +1786,7 @@ a single 72 port switch.
can be equipped with an additional network device connected to an
external network; this host then additionally acts as a gateway.
13.2.1 MT Bonding Mode Selection for Multiple Switch Topology
12.2.1 MT Bonding Mode Selection for Multiple Switch Topology
-------------------------------------------------------------
In actual practice, the bonding mode typically employed in
......@@ -1664,7 +1799,7 @@ packets has arrived). When employed in this fashion, the balance-rr
mode allows individual connections between two hosts to effectively
utilize greater than one interface's bandwidth.
13.2.2 MT Link Monitoring for Multiple Switch Topology
12.2.2 MT Link Monitoring for Multiple Switch Topology
------------------------------------------------------
Again, in actual practice, the MII monitor is most often used
......@@ -1674,10 +1809,10 @@ advantages over the MII monitor are mitigated by the volume of probes
needed as the number of systems involved grows (remember that each
host in the network is configured with bonding).
14. Switch Behavior Issues
13. Switch Behavior Issues
==========================
14.1 Link Establishment and Failover Delays
13.1 Link Establishment and Failover Delays
-------------------------------------------
Some switches exhibit undesirable behavior with regard to the
......@@ -1712,7 +1847,7 @@ switches take a long time to go into backup mode, it may be desirable
to not activate a backup interface immediately after a link goes down.
Failover may be delayed via the downdelay bonding module option.
14.2 Duplicated Incoming Packets
13.2 Duplicated Incoming Packets
--------------------------------
It is not uncommon to observe a short burst of duplicated
......@@ -1751,14 +1886,14 @@ behavior, it can be induced by clearing the MAC forwarding table (on
most Cisco switches, the privileged command "clear mac address-table
dynamic" will accomplish this).
15. Hardware Specific Considerations
14. Hardware Specific Considerations
====================================
This section contains additional information for configuring
bonding on specific hardware platforms, or for interfacing bonding
with particular switches or other devices.
15.1 IBM BladeCenter
14.1 IBM BladeCenter
--------------------
This applies to the JS20 and similar systems.
......@@ -1861,7 +1996,7 @@ bonding driver.
avoid fail-over delay issues when using bonding.
16. Frequently Asked Questions
15. Frequently Asked Questions
==============================
1. Is it SMP safe?
......@@ -1925,7 +2060,7 @@ not have special switch requirements, but do need device drivers that
support specific features (described in the appropriate section under
module parameters, above).
In 802.3ad mode, it works with with systems that support IEEE
In 802.3ad mode, it works with systems that support IEEE
802.3ad Dynamic Link Aggregation. Most managed and many unmanaged
switches currently available support 802.3ad.
......
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