Signed-off-by: Richard Cochran <richardcoch...@gmail.com>
---
clock.c | 3 ++-
config.c | 1 +
default.cfg | 1 +
gPTP.cfg | 1 +
ptp4l.8 | 14 ++++++++++++++
5 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/clock.c b/clock.c
index d1dbb86..ac57cb5 100644
--- a/clock.c
+++ b/clock.c
@@ -895,7 +895,8 @@ struct clock *clock_create(enum clock_type type, struct
config *config,
c->dds.flags & DDS_SLAVE_ONLY) {
c->dds.clockQuality.clockClass = 255;
}
- c->default_dataset.localPriority = 128;
+ c->default_dataset.localPriority =
+ config_get_int(config, NULL, "defaultDS.localPriority");
if (!(c->dds.flags & DDS_TWO_STEP_FLAG)) {
switch (timestamping) {
diff --git a/config.c b/config.c
index e6fe676..3d1a752 100644
--- a/config.c
+++ b/config.c
@@ -176,6 +176,7 @@ struct config_item config_tab[] = {
GLOB_ITEM_INT("clockAccuracy", 0xfe, 0, UINT8_MAX),
GLOB_ITEM_INT("clockClass", 248, 0, UINT8_MAX),
GLOB_ITEM_ENU("clock_servo", CLOCK_SERVO_PI, clock_servo_enu),
+ GLOB_ITEM_INT("defaultDS.localPriority", 128, 1, UINT8_MAX),
PORT_ITEM_INT("delayAsymmetry", 0, INT_MIN, INT_MAX),
PORT_ITEM_ENU("delay_filter", FILTER_MOVING_MEDIAN, delay_filter_enu),
PORT_ITEM_INT("delay_filter_length", 10, 1, INT_MAX),
diff --git a/default.cfg b/default.cfg
index ebb263a..1b5f493 100644
--- a/default.cfg
+++ b/default.cfg
@@ -13,6 +13,7 @@ clockAccuracy 0xFE
offsetScaledLogVariance 0xFFFF
free_running 0
freq_est_interval 1
+defaultDS.localPriority 128
dscp_event 0
dscp_general 0
#
diff --git a/gPTP.cfg b/gPTP.cfg
index 142996a..d9a0140 100644
--- a/gPTP.cfg
+++ b/gPTP.cfg
@@ -13,6 +13,7 @@ clockAccuracy 0xFE
offsetScaledLogVariance 0xFFFF
free_running 0
freq_est_interval 1
+defaultDS.localPriority 128
#
# Port Data Set
#
diff --git a/ptp4l.8 b/ptp4l.8
index a724151..1e43458 100644
--- a/ptp4l.8
+++ b/ptp4l.8
@@ -323,6 +323,20 @@ The offsetScaledLogVariance attribute of the local clock.
It characterizes the
stability of the clock.
The default is 0xFFFF.
.TP
+.B defaultDS.localPriority
+The Telecom Profile (ITU-T G.8275.1) specifies an alternate Best
+Master Clock Algorithm (BMCA) with a unique data set comparison
+algorithm. The value of this option is associated with the local
+clock and is used as a tie breaker whenever clockClass, clockAccuracy,
+offsetScaledLogVariance, and priority2 are equal. This option is only
+used when "dataset_comparison" is set to "telecom".
+The default value is 128.
+
+Warning: the BMCA is guaranteed to produce a spanning tree (that is, a
+timing network without loops) only when using the default values of
+defaultDS.localPriority and portDS.localPriority. Careful network
+engineering is needed when using non-default values.
+.TP
.B domainNumber
The domain attribute of the local clock.
The default is 0.
--
2.11.0
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