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-rw-r--r--Documentation/networking/bonding.txt13
1 files changed, 11 insertions, 2 deletions
diff --git a/Documentation/networking/bonding.txt b/Documentation/networking/bonding.txt
index 1f45bd887d65..675612ff41ae 100644
--- a/Documentation/networking/bonding.txt
+++ b/Documentation/networking/bonding.txt
@@ -770,8 +770,17 @@ resend_igmp
a failover event. One membership report is issued immediately after
the failover, subsequent packets are sent in each 200ms interval.
- The valid range is 0 - 255; the default value is 1. This option
- was added for bonding version 3.7.0.
+ The valid range is 0 - 255; the default value is 1. A value of 0
+ prevents the IGMP membership report from being issued in response
+ to the failover event.
+
+ This option is useful for bonding modes balance-rr (0), active-backup
+ (1), balance-tlb (5) and balance-alb (6), in which a failover can
+ switch the IGMP traffic from one slave to another. Therefore a fresh
+ IGMP report must be issued to cause the switch to forward the incoming
+ IGMP traffic over the newly selected slave.
+
+ This option was added for bonding version 3.7.0.
3. Configuring Bonding Devices
==============================