Signed-off-by: Richard Cochran <[email protected]>
---
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 19ce805..90f5b0f 100644
--- a/clock.c
+++ b/clock.c
@@ -931,7 +931,8 @@ 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, "G.8275.defaultDS.localPriority");
/* Harmonize the twoStepFlag with the time_stamping option. */
if (config_harmonize_onestep(config)) {
diff --git a/config.c b/config.c
index 320cc1b..9c26ccd 100644
--- a/config.c
+++ b/config.c
@@ -192,6 +192,7 @@ struct config_item config_tab[] = {
PORT_ITEM_INT("follow_up_info", 0, 0, 1),
GLOB_ITEM_INT("free_running", 0, 0, 1),
PORT_ITEM_INT("freq_est_interval", 1, 0, INT_MAX),
+ GLOB_ITEM_INT("G.8275.defaultDS.localPriority", 128, 1, UINT8_MAX),
GLOB_ITEM_INT("gmCapable", 1, 0, 1),
PORT_ITEM_INT("hybrid_e2e", 0, 0, 1),
PORT_ITEM_INT("ignore_transport_specific", 0, 0, 1),
diff --git a/default.cfg b/default.cfg
index e76aeae..9736568 100644
--- a/default.cfg
+++ b/default.cfg
@@ -15,6 +15,7 @@ free_running 0
freq_est_interval 1
dscp_event 0
dscp_general 0
+G.8275.defaultDS.localPriority 128
#
# Port Data Set
#
diff --git a/gPTP.cfg b/gPTP.cfg
index 1e7a33e..02fd395 100644
--- a/gPTP.cfg
+++ b/gPTP.cfg
@@ -13,6 +13,7 @@ clockAccuracy 0xFE
offsetScaledLogVariance 0xFFFF
free_running 0
freq_est_interval 1
+G.8275.defaultDS.localPriority 128
#
# Port Data Set
#
diff --git a/ptp4l.8 b/ptp4l.8
index 950e07c..10f55f2 100644
--- a/ptp4l.8
+++ b/ptp4l.8
@@ -341,6 +341,20 @@ The offsetScaledLogVariance attribute of the local clock.
It characterizes the
stability of the clock.
The default is 0xFFFF.
.TP
+.B G.8275.defaultDS.localPriority
+The Telecom Profiles (ITU-T G.8275.1 and G.8275.2) specify 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
+G.8275.defaultDS.localPriority and G.8275.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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