45Usage guidelinesBoth PTP and NTP can synchronize the local device time. However, do not configure them as the targetend at the same time for time synchronization. In other words, do not configure the local device as anNTP client when it is a PTP member clock or a PTP member clock when it is an NTP client.Before you change the clock node type of a device, disable relevant PTP configurations: remove the clocknode type configuration, disable PTP on all interfaces, remove the working mode configuration for anOC, and remove the Peer Delay mechanism configuration on the PTP port for a non-TC clock. Clock typeswitchover is allowed between OC and BC, or among E2ETC, P2PTC, E2ETC+OC, and P2PTC+OC.Examples# Specify the clock node type as OC for the device. system-view[Sysname] ptp mode ocRelated commands• ptp delay-mechanism• ptp enable• ptp slave-onlyptp pdelay-req-intervalUse ptp pdelay-req-interval to configure the interval for sending Pdelay_Req messages.Use undo ptp pdelay-req-interval to restore the default.Syntaxptp pdelay-req-interval valueundo ptp pdelay-req-intervalDefaultThe interval for sending Pdelay_Req messages is 1 (2 0 ) second.ViewsLayer 2 Ethernet interface view, Layer 3 Ethernet interface viewDefault command level2: System levelParametersvalue: Specifies the Pdelay_Req message sending interval (in seconds). The intervals use log base 2values, where value ranges from –4 to 6.Examples# Configure the Pdelay_Req message sending interval on FortyGigE 1/0/1 as 4 (2 2 ) seconds. system-view[Sysname] interface fortygige 1/0/1[Sysname-FortyGigE1/0/1] ptp pdelay-req-interval 2
