sctp: Implement quick failover draft from tsvwg

[linux-2.6-block.git] / Documentation / networking / ip-sysctl.txt

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 5f3ef7f7fcec079bd7baa911f99a12f73c3e26b6..406a5226220d2d9e985bb549a972d354c59f0181 100644 (file)
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -1440,6 +1440,20 @@ path_max_retrans - INTEGER
 
        Default: 5
 
+pf_retrans - INTEGER
+       The number of retransmissions that will be attempted on a given path
+       before traffic is redirected to an alternate transport (should one
+       exist).  Note this is distinct from path_max_retrans, as a path that
+       passes the pf_retrans threshold can still be used.  Its only
+       deprioritized when a transmission path is selected by the stack.  This
+       setting is primarily used to enable fast failover mechanisms without
+       having to reduce path_max_retrans to a very low value.  See:
+       http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
+       for details.  Note also that a value of pf_retrans > path_max_retrans
+       disables this feature
+
+       Default: 0
+
 rto_initial - INTEGER
        The initial round trip timeout value in milliseconds that will be used
        in calculating round trip times.  This is the initial time interval