git: dddf410362b9 - stable/12 - bridge.4: Document the net.link.bridge.log_mac_flap sysctl variable

The branch stable/12 has been updated by zlei:

URL: https://cgit.FreeBSD.org/src/commit/?id=dddf410362b9eaf8ae9fe13f5edd9fd67f24046e

commit dddf410362b9eaf8ae9fe13f5edd9fd67f24046e
Author:     Zhenlei Huang <zlei@FreeBSD.org>
AuthorDate: 2023-04-10 10:07:04 +0000
Commit:     Zhenlei Huang <zlei@FreeBSD.org>
CommitDate: 2023-09-01 10:10:40 +0000

    bridge.4: Document the net.link.bridge.log_mac_flap sysctl variable
    
    It was introduced in 2d3614fb132b (bridge: Log MAC address port flapping).
    
    Reviewed by:    gbe (manpages)
    MFC after:      2 weeks
    Differential Revision:  https://reviews.freebsd.org/D39465
    
    (cherry picked from commit 3fdb40d1befe7b561e7e5fa0b5c80aac41adc50d)
    (cherry picked from commit 5a3f517110ef2d076274ca0cc41668740d62e9c7)
---
 share/man/man4/bridge.4 | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/share/man/man4/bridge.4 b/share/man/man4/bridge.4
index d787db1aa141..6b32da22efce 100644
--- a/share/man/man4/bridge.4
+++ b/share/man/man4/bridge.4
@@ -35,7 +35,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd October 16, 2017
+.Dd April 10, 2023
 .Dt IF_BRIDGE 4
 .Os
 .Sh NAME
@@ -118,6 +118,15 @@ interfaces that are part of the bridge.
 For unicast traffic, the bridge learns which MAC addresses are associated
 with which interfaces and will forward the traffic selectively.
 .Pp
+By default the bridge logs MAC address port flapping to
+.Xr syslog 3 .
+This behavior can be disabled by setting the
+.Xr sysctl 8
+variable
+.Va net.link.bridge.log_mac_flap
+to
+.Li 0 .
+.Pp
 All the bridged member interfaces need to be up in order to pass network traffic.
 These can be enabled using
 .Xr ifconfig 8