[ovs-dev] [PATCH 7/8] vswitchd: Implement balance-tcp bonding.
Ben Pfaff
blp at nicira.com
Thu Feb 3 00:37:27 UTC 2011
On Wed, Feb 02, 2011 at 01:27:17PM -0800, Ethan Jackson wrote:
> diff --git a/vswitchd/vswitch.xml b/vswitchd/vswitch.xml
> index d9e71b3..0fa09d6 100644
> --- a/vswitchd/vswitch.xml
> +++ b/vswitchd/vswitch.xml
> @@ -509,21 +509,29 @@
> <group title="Bonding Configuration">
> <p>A port that has more than one interface is a ``bonded port.'' Bonding
> allows for load balancing and fail-over. Open vSwitch supports
> - ``source load balancing'' (SLB) and "active backup" bonding. SLB
> - bonding assigns flows to slaves based on source MAC address and output
> - VLAN, with periodic rebalancing as traffic patterns change. Active
> - backup bonding assigns all flows to one slave, failing over to a backup
> - slave when the active slave is disabled. Neither form of bonding
> - require 802.3ad or other special support from the upstream switch to
> - which the slave devices are connected.</p>
> + <code>balance-slb</code>, <code>balance-tcp</code>, and
> + <code>active-backup</code> bonding. <code>balance-slb</code> bonding
> + assigns flows to slaves based on source MAC address and output VLAN,
> + with periodic rebalancing as traffic patterns change.
> + <code>balance-tcp</code> behaves like <code>balance-slb</code>, but
> + additionally takes into account L2, L3, and L4 protocol information
> + such as such as destination MAC address, IP address, and TCP port.
> + <code>active-backup</code> bonding assigns all flows to one slave,
> + failing over to a backup slave when the active slave is disabled.
> + Neither <code>balance-slb</code> nor <code>active-backup</code> require
> + 802.3ad or other special support from the upstream switch to which the
> + slave devices are connected. <code>balance-tcp</code> requires
> + successful LACP negotiations and will fall back to
> + <code>balance-slb</code> style hashing otherwise.
> + </p>
It looks OK (I see a doubled "such as" in the middle). Maybe we can
phrase it in a way that helps people decide what they should be using,
e.g.:
<p>A port that has more than one interface is a ``bonded port.''
Bonding allows for load balancing and fail-over. Some kinds of
bonding will work with any kind of upstream switch:</p>
<dl>
<dt><code>balance-slb</code></dt>
<dd>
Balances flows among slaves based on source MAC address
and output VLAN, with periodic rebalancing as traffic patterns
change.
</dd>
<dt><code>active-backup</code></dt>
<dd>
Assigns all flows to one slave,
failing over to a backup slave when the active slave is disabled.
</dd>
</dl>
<p>
The following mode requires the upstream switch to support
802.3ad with successful LACP negotiation. If LACP negotiation
fails then <code>balance-slb</code> mode isused as a fallback:
</p>
<dl>
<dt><code>balance-tcp</code></dt>
<dd>
Balances flows among slaves based on L2, L3, and L4 protocol
information such as destination MAC address, IP address, and
TCP port.
</dd>
</dl>
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