Specifications

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Cisco MWR 2941 Mobile Wireless Edge Router Release 3.5 Software Configuration Guide, Cisco IOS Release 15.1(3)MR
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Chapter 16 Configuring Clocking and Timing
Configuring Clocking and Timing
Enabling PTP on Multiple VLANs
You can enable PTP on up to three VLANs at a time. The following restrictions apply:
• All PTP-enabled VLANs must use PTP master or PTP slave; you cannot configure PTP master and
PTP slave VLANs at the same time.
• All PTP-enabled VLANs must use multicast or unicast, but not both.
Configure the Global Network Clock
Use the network-clock-select command to configure clock selection for the entire network.
• If you configured the router for PTP master mode, set one or more external clock sources using the
network-clock-select command with the synchronous Ethernet, bits, E1, or T1 interface
parameters:
Router(config)# network-clock-select 1 BITS
Router(config)# network-clock-select 2 SYNC 0
Router(config)# network-clock-select 3 E1 0/0
• If you configured the router for PTP slave mode, enter the following commands:
Router(config)# network-clock-select 1 PACKET-TIMING
Router(config)# network-clock-select hold-timeout 900
Note The network-clock-select hold-timeout command is optional; the minimum recommended value in the
slave mode is 900 seconds or 15 minutes. For more information about this command, see the Cisco MWR
2941 Mobile Wireless Edge Router IOS Command Reference, Release 15.0(1)MR.
Configuring PTP Input and Output
You can use the 1pps and 10Mhz timing ports on the Cisco MWR 2941-DC-A to do the following:
• Provide or receive 1PPS time of day messages
• Provide output clocking at 10Mhz, 2.048Mhz, and 1.544Mhz
• Receive input clocking at 10Mhz, 2.048Mhz, and 1.544Mhz
Note This section applies only to the Cisco MWR 2941-DC-A.
The following section describes how to configure time of day messages, output clocking, and input
clocking.
• If you want to configure PTP input clocking using the 10Mhz timing port, complete the following
steps:
– Use the ptp input command to enable PTP input clocking at 10Mhz, 2.048Mhz, or 1.544Mhz.
Router(config)# ptp input 10M
– Use the network-clock-select command to select the port to use for input clocking.
Router(config)# network-clock-select 10 10M
Input clocking applies when the router is in PTP master mode.