Hi,
it might be helpful for others to understand the meaning of codepoints 0
and 1 of the vlan priority field. OK?
Christopher
Here is the formatted content:
The 802.1Q and 802.1ad protocols include a 3-bit priority code point
(PCP):
PCP 1 is defined as the lowest priority (“background”)
PCP 0 is the default (“best effort”) - second lowest priority.
PCPs 2-7 are increasing priority above best effort.
The priority may be altered via pf.conf(5); see the prio option for more
information.
“prio 0” is mapped to PCP 1.
“prio 1” is mapped to PCP 0.
“prio 2-7” are mapped to PCP 2-7.
Alternatively, the txprio property of an interface can set a specific
priority for transmitted packets.
And here's the diff:
Index: vlan.4
===================================================================
RCS file: /cvs/src/share/man/man4/vlan.4,v
retrieving revision 1.51
diff -u -p -r1.51 vlan.4
--- vlan.4 4 Oct 2020 12:44:49 -0000 1.51
+++ vlan.4 20 Dec 2021 14:51:31 -0000
@@ -83,16 +83,38 @@ interfaces by their respective protocol
identifiers, and decapsulated for reception on the associated virtual
interfaces.
.Pp
-The 802.1Q and 802.1ad protocols include a priority field.
-By default, the 802.1p priority in a transmitted packet is based on the
-priority of packets sent over the interface, which may
-be altered via
+The 802.1Q and 802.1ad protocols include a 3-bit priority code point
+(PCP):
+.Bl -item -compact -offset MMM
+.It
+PCP 1 is defined as the lowest priority
+.Pq Dq background
+.It
+PCP 0 is the default
+.Pq Dq best effort
+- second lowest priority.
+.It
+PCPs 2-7 are increasing priority above best effort.
+.El
+The priority may be altered via
.Xr pf.conf 5 ;
see the
.Cm prio
option for more information.
-Alternatively,
+.Bl -item -compact -offset MMM
+.It
+.Dq prio 0
+is mapped to PCP 1.
+.It
+.Dq prio 1
+is mapped to PCP 0.
+.It
+.Dq prio 2-7
+are mapped to PCP 2-7.
+.El
+Alternatively, the
.Cm txprio
+property of an interface
can set a specific priority for transmitted packets.
.Pp
.Nm vlan
