MFC r1.22, 1.23

- Note that the bridge uses a random MAC and can be overridden.
  - Provide an example of assigning an IP to the bridge.

Approved by:	re (bmah)

share/man/man4/if_bridge.4

@@ -35,7 +35,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd August 13, 2006
+.Dd October 8, 2006
 .Dt IF_BRIDGE 4
 .Os
 .Sh NAME
@@ -77,6 +77,13 @@ command or using the
 variable in
 .Xr rc.conf 5 .
 .Pp
+The
+.Nm
+interface randomly chooses a link (MAC) address in the range reserved for
+locally adminstered addresses when it is created.
+The address can be changed by assigning the desired link address using
+.Xr ifconfig 8 .
+.Pp
 A bridge can be used to provide several services, such as a simple
 802.11-to-Ethernet bridge for wireless hosts, and traffic isolation.
 .Pp
@@ -226,6 +233,17 @@ ifconfig bridge0 \e
     up
 .Ed
 .Pp
+The bridge can be used as a regular host interface at the same time as bridging
+between its member ports.
+In this example, the bridge connects em0 and em1, and will receive its IP
+address through DHCP:
+.Bd -literal -offset indent
+cloned_interfaces="bridge0"
+ifconfig_bridge0="addm em0 addm em1 DHCP"
+ifconfig_em0="up"
+ifconfig_em1="up"
+.Ed
+.Pp
 The bridge can tunnel Ethernet across an IP internet using the EtherIP
 protocol.
 This can be combined with