Synchronizing Time on Cisco Remote PHY Shelf 7200

This section explains how to synchronize time on the RPD and CCAP core of the Cisco cBR Router.

Hardware Compatibility Matrix for Cisco Remote PHY Shelf 7200


Note

Unless otherwise specified, the hardware components introduced in a given Cisco Remote PHY Shelf 7200 Software Release are supported in all subsequent releases.

Table 1. Hardware Compatibility Matrix for the Cisco Remote PHY Shelf 7200

Cisco CMTS Platform

Cisco Remote PHY Shelf 7200

Cisco cBR-8 Converged Broadband Router with Cisco IOS XE Gibraltar 16.10.1 and Later Releases

Cisco Remote PHY Shelf 7200 Software 1.1 and Later Releases

Cisco Remote PHY Shelf 7200

  • PID—HA-RPHY

Information about Time Synchronization

In a Remote PHY system, synchronizing its local timestamp and reference frequency to the cable converged access platform core function (CCAP Core) is important. The protocol used for this feature, the Precision Time Protocol (PTP), helps in synchronizing time between a CCAP core function and a series of remote PHY devices (RPD) that enable R-PHY and provides support for converged DOCSIS, video, and out-of-band (OOB) services.

Cisco CBR-8 supports PTP Ordinary Clock (OC) slave mode, in which the PTP slave ports are from the backhaul 10GE Ethernet ports or the management Ethernet ports of SUP PIC.

Remote DTI

Remote DOCSIS Timing Interface (R-DTI) is the network synchronization protocol used between CCAP-core and R-PHY. When traffic from the CCAP-Core is received on the downstream receiver, the following processes occur:

  • Terminates DEPI framing

  • Extracts the payload, frames it, modulates, and transmits it out

During the upstream process, the signal is received from the coax and the system demodulates it. From the FEC payload, the DOCSIS frames are extracted and placed in the UEPI encapsulation. The frames are then transmitted through the upstream transmitter to the CCAP core. A local CPU manages DEPI and GCP control planes, and interfaces with network management. A clocking circuit interfaces with the R-DTI and manages clocking for the R-DTI entity.

How to Configure Time Synchronization


Note

To know more about the commands referenced in this module, see the Cisco IOS Master Command List.

Configuring Time Interface and PTP domain

To configure time interface and PTP domain, use the following procedure.
enable
configure terminal
interface type [slot_#/port_#
interface Loopback1588
  ip address <IP Address/subnet>

interface TenGigabitEthernet<slot/port> 
  ip address <IP Address/subnet>

ip route < PTP master IP Address/subnet> < loopback IP Address> 

ptp clock ordinary domain 55 (This is for CBR PTP connection)   
 servo tracking-type R-DTI
 clock-port slave-from-903 slave
  delay-req interval -4
  sync interval -5
  sync one-step
  transport ipv4 unicast interface Lo1588 negotiation
  clock source < PTP master loopback IP Address>

The following table explains the parameters used in this example:

Table 2. Parameters for time interface and PTP domain configuration

Parameter

Description

Value Range

Default Value

ptp r-dti [id]

1-64

description

R-DTI name or description

ptp-domain [id]

Domain number of IEEE 1588

0-127

local-priority [value]

Set local priority

128

128

priority1 [value]

Set priority1

0-255

128

priority2 [value]

Set priority2

0-255

255

mode [value]

R-DTI mode

other, slave master

slave

profile [value]

Set PTP ITU-T profile

default/G.8275.2

default

clock-port [id]

Configure clock port

1-32

state [value]

Set Ethernet port admin status

other, up, down, testing

up

ethenet [value]

Set Ethernet port for clock port

0-32

The default value is clock port index

clock source [ip] gateway [ip]

Set clock address

ipv4 address, ipv6 address

clock alternate-first

Select alternate source first

transport [value]

Set transport encapsulation

other, ipv4, ipv6

ipv4

transport cos [value]

COS of 802.1Q

0-7

6

transport dscp [value]

DSCP of IP differentiated services

0-63

47

local-priority [value]

Set local priority

1-255

128

sync interval [value]

Set an interval for sync packets

0-7(-7 -0)

announce interval [value]

Set an interval for announcement packets

0-3(-3 -0)

delay-req interval [value]

Set an interval for PTP delay-req packets0-7(-7 -0)

announce timeout [value]

Set timeout interval for announcement packets

3-255

unicast grant-duration [value]

Set the grant duration time in seconds for unicast

60-1000

300

description

Clock port name or description

Verifying Time Interface and PTP Domain Configuration

The following example shows how to verify the time interface and PTP domain configuration:
Router# show ptp clock running domain 55
                      PTP Ordinary Clock [Domain 55] 
         State          Ports          Pkts sent      Pkts rcvd      Redundancy Mode
         PHASE_ALIGNED  1              16012          45126          Hot standby
                               PORT SUMMARY
                                                                                PTP Master
Name           Tx Mode      Role         Transport    State        Sessions     Port Addr
slave-from-903 unicast      slave        Lo1588       Uncalibrated 1            10.10.1.11
                             SESSION INFORMATION
slave-from-903 [Lo1588] [Sessions 1]
 Peer addr          Pkts in    Pkts out   In Errs    Out Errs  
 10.10.1.11         45126      16012      0          0

Configure RPD PTP Connection

To configure RPD PTP connection, use the following commands.
enable
configure terminal
interface type [slot_#/]port_#
ptp r-dti 55(RPD PTP connection)
 profile G.8275.2
 ptp-domain 0
 clock-port <same domain number with PTP server>
  clock source ip <IP Address> gateway ip <IP Address>
  clock source ip <IP Address> gateway ip <IP Address> alternate
  !--<clock-source is PTP master loopback ip, gw is the next hop to reach the ptp master>--!

Verifying RPD PTP Connection Configuration

The following example shows how to verify the RPD PTP Connection configuration:
Router# show ptp clock 0 config
Domain/Mode         :   0/OC_MASTER
Priority 1/2/local  : 128/255/128
Profile             : 001b19000100-000000 E2E
Total Ports/Streams : 1  /0
--PTP Port 188, Enet Port   0 ----
  Port local Address :192.168.100.100
  Unicast   Duration :300 Sync Interval : -4
  Announce  Interval :  1 Timeout       :  3
  Delay-Req Intreval : -4 Pdelay-req    : -4
  Priority  local    :128 COS:  3   DSCP: 47

Router# show ptp clock 1 config  
Domain/Mode         :  55/OC_SLAVE
Priority 1/2/local  : 128/255/128
Profile             : 001b19000100-000000 E2E
Total Ports/Streams : 1  /1
--PTP Port  22, Enet Port   1 ----
  Port local Address :40.3.6.185
  Unicast   Duration :300 Sync Interval : -4
  Announce  Interval :  0 Timeout       : 11
  Delay-Req Intreval : -4 Pdelay-req    : -4
  Priority  local    :128 COS:  6   DSCP: 47
  ==Stream 4 : Port 22 Master IP: 10.10.1.11

Router# show ptp clock 2 config  
Domain/Mode         :  55/OC_SLAVE
Priority 1/2/local  : 128/255/128
Profile             : 001b19000100-000000 E2E
Total Ports/Streams : 1  /1
--PTP Port  22, Enet Port   1 ----
  Port local Address :40.3.6.187
  Unicast   Duration :300 Sync Interval : -4
  Announce  Interval :  0 Timeout       : 11
  Delay-Req Intreval : -4 Pdelay-req    : -4
  Priority  local    :128 COS:  6   DSCP: 47
  ==Stream 0 : Port 22 Master IP: 10.10.1.11

Router# show ptp clock 3 config  
Domain/Mode         :  55/OC_SLAVE
Priority 1/2/local  : 128/255/128
Profile             : 001b19000100-000000 E2E
Total Ports/Streams : 1  /1
--PTP Port  22, Enet Port   1 ----
  Port local Address :40.3.6.189
  Unicast   Duration :300 Sync Interval : -4
  Announce  Interval :  0 Timeout       : 11
  Delay-Req Intreval : -4 Pdelay-req    : -4
  Priority  local    :128 COS:  6   DSCP: 47
  ==Stream 2 : Port 22 Master IP: 10.10.1.11

Router# show ptp clock 4 config  
Domain/Mode         :  55/OC_SLAVE
Priority 1/2/local  : 128/255/128
Profile             : 001b19000100-000000 E2E
Total Ports/Streams : 1  /1
--PTP Port  22, Enet Port   1 ----
  Port local Address :40.3.6.191
  Unicast   Duration :300 Sync Interval : -4
  Announce  Interval :  0 Timeout       : 11
  Delay-Req Intreval : -4 Pdelay-req    : -4
  Priority  local    :128 COS:  6   DSCP: 47
  ==Stream 6 : Port 22 Master IP: 10.10.1.11

Router# show ptp clock 5 config  
Domain/Mode         :  55/OC_SLAVE
Priority 1/2/local  : 128/255/128
Profile             : 001b19000100-000000 E2E
Total Ports/Streams : 1  /1
--PTP Port  22, Enet Port   1 ----
  Port local Address :40.3.6.193
  Unicast   Duration :300 Sync Interval : -4
  Announce  Interval :  0 Timeout       : 11
  Delay-Req Intreval : -4 Pdelay-req    : -4
  Priority  local    :128 COS:  6   DSCP: 47
  ==Stream 8 : Port 22 Master IP: 10.10.1.11

Router# show ptp clock 6 config  
Domain/Mode         :  55/OC_SLAVE
Priority 1/2/local  : 128/255/128
Profile             : 001b19000100-000000 E2E
Total Ports/Streams : 1  /1
--PTP Port  22, Enet Port   1 ----
  Port local Address :40.3.6.194
  Unicast   Duration :300 Sync Interval : -4
  Announce  Interval :  0 Timeout       : 11
  Delay-Req Intreval : -4 Pdelay-req    : -4
  Priority  local    :128 COS:  6   DSCP: 47
  ==Stream 10: Port 22 Master IP: 10.10.1.11

Associate R-DTI with RPD

To associate the RPD with R-DTI, use the following commands..
enable
configure terminal
interface type [slot_#/]port_#
cable rpd node1
identifier badb.ad17.4820 (node vbh0 mac) 
 core-interface Te7/1/4
 rpd-ds 0 downstream-cable 7/0/16 profile 0
 rpd-us 0 upstream-cable 7/0/16 profile 0
r-dti 20
rpd-event profile 0

Verifying Associating R-DTI with RPD

The following example shows how to verify whether the RPD is associated to R-DTI:
Router# show running-config | sec r-dti
r-dti 20
 r-dti 20
 r-dti 20
 r-dti 20
 r-dti 20
 r-dti 20
ptp r-dti 20
profile G.8275.2
 ptp-domain 55
 clock-port 22
   ethernet 1
   clock source ip 10.10.1.11

Router# show running-config | sec cable rpd
cable rpd nh13-00
 identifier badb.ad17.4820
 core-interface Te7/1/4
  principal
  rpd-ds 0 downstream-cable 7/0/16 profile 0
  rpd-us 0 upstream-cable 7/0/16 profile 0
 r-dti 20
 rpd-event profile 0
cable rpd nh13-01
 identifier badb.ad17.4821
 core-interface Te7/1/4
  principal
  rpd-ds 0 downstream-cable 7/0/17 profile 0
  rpd-us 0 upstream-cable 7/0/17 profile 0
 r-dti 20
 rpd-event profile 0
cable rpd nh13-02
 identifier badb.ad17.4822
 core-interface Te7/1/4
  principal
  rpd-ds 0 downstream-cable 7/0/18 profile 0
  rpd-us 0 upstream-cable 7/0/18 profile 0
 r-dti 20
 rpd-event profile 0
cable rpd nh13-03
 identifier badb.ad17.4823
 core-interface Te7/1/4
  principal
  rpd-ds 0 downstream-cable 7/0/19 profile 0
  rpd-us 0 upstream-cable 7/0/19 profile 0
 r-dti 20
rpd-event profile 0
cable rpd nh13-04
 identifier badb.ad17.4824
 core-interface Te7/1/4
  principal
  rpd-ds 0 downstream-cable 7/0/20 profile 0
  rpd-us 0 upstream-cable 7/0/20 profile 0
 r-dti 20
 rpd-event profile 0
cable rpd nh13-05
 identifier badb.ad17.4825
 core-interface Te7/1/4
  principal
  rpd-ds 0 downstream-cable 7/0/21 profile 0
  rpd-us 0 upstream-cable 7/0/21 profile 0
 r-dti 20
 rpd-event profile 0

Verifying PTP Clock Functioning

To verify whether the PTP Clock is running, use the following commands:
Router#show ptp clock running 
                      PTP Ordinary Clock [Domain 55] 
         State          Ports          Pkts sent      Pkts rcvd      Redundancy Mode
         PHASE_ALIGNED  1              40979          120805         Hot standby

                               PORT SUMMARY
                                                                                PTP Master
Name           Tx Mode      Role         Transport    State        Sessions     Port Addr
slave-from-903 unicast      slave        Lo1588       Slave        1            10.10.1.11

Verifying PTP Clock Running Domain

The following example shows how to verify the PTP clock running domain:
Router# show ptp clock running domain 55
                      PTP Ordinary Clock [Domain 55] 
         State          Ports          Pkts sent      Pkts rcvd      Redundancy Mode
         PHASE_ALIGNED  1              16012          45126          Hot standby
                               PORT SUMMARY
                                                                                PTP Master
Name           Tx Mode      Role         Transport    State        Sessions     Port Addr
slave-from-903 unicast      slave        Lo1588       Uncalibrated 1            10.10.1.11
                             SESSION INFORMATION
slave-from-903 [Lo1588] [Sessions 1]
 Peer addr          Pkts in    Pkts out   In Errs    Out Errs  
10.10.1.11         45126      16012      0          0

Verifying Time Sync State

To verify the status of time synchronization, use the show ptp clock <n> state command as given in the following example:
Router# show ptp clock 0 state
apr state       : PHASE_LOCK
clock state     : CLOCK_VERIFY
current tod     : 1541653898   Thu Nov  8 05:11:38 2018
active stream   : 0
==stream    0   :
  port id       :                0
  master ip     :       10.10.1.11
  local ip      :       40.3.6.187
  stream state  :       PHASE_LOCK
  Master offset :             -698
  Path    delay :            63314
  Forward delay :            62616
  Reverse delay :            62973
  Freq offset   :           -88276
  1Hz  offset   :              -34
==stream    2   :
  port id       :                1
  master ip     :       10.10.1.11
  local ip      :       40.3.6.189
  stream state  :       PHASE_LOCK
  Master offset :              490
  Path    delay :            72755
  Forward delay :            73471
  Reverse delay :            72039
  Freq offset   :           -85798
  1Hz  offset   :            -5123
==stream    4   :
  port id       :                2
  master ip     :       10.10.1.11
  local ip      :       40.3.6.185
  stream state  :       PHASE_LOCK
  Master offset :             -604
  Path    delay :            63017
  Forward delay :            62413
  Reverse delay :            62997
  Freq offset   :           -87014
  1Hz  offset   :               70
==stream    8   :
  port id       :                4
  master ip     :       10.10.1.11
  local ip      :       40.3.6.193
  stream state  :       PHASE_LOCK
  Master offset :              664
  Path    delay :            63231
  Forward delay :            63691
  Reverse delay :            62771
  Freq offset   :           -86365
  1Hz  offset   :               -6

Router# show ptp clock 1 state 
apr state       : PHASE_LOCK
clock state     : CLOCK_VERIFY
current tod     : 1541653902   Thu Nov  8 05:11:42 2018
active stream   : 0

Router# show ptp clock 2 state 
apr state       : PHASE_LOCK
clock state     : CLOCK_VERIFY
current tod     : 1541653906   Thu Nov  8 05:11:46 2018
active stream   : 0

Router# show ptp clock 3 state 
apr state       : PHASE_LOCK
clock state     : CLOCK_VERIFY
current tod     : 1541653909   Thu Nov  8 05:11:49 2018
active stream   : 0

Router# show ptp clock 4 state 
apr state       : PHASE_LOCK
clock state     : CLOCK_VERIFY
current tod     : 1541653912   Thu Nov  8 05:11:52 2018
active stream   : 0

Router# show ptp clock 5 state
apr state       : PHASE_LOCK
clock state     : CLOCK_VERIFY
current tod     : 1541653918   Thu Nov  8 05:11:58 2018
active stream   : 0

Router# show ptp clock 6 state 
apr state       : PHASE_LOCK
clock state     : CLOCK_VERIFY
current tod     : 1541653920   Thu Nov  8 05:12:00 2018
active stream   : 0

Verifying Time Sync Statistics

To verify the statistics of the time synchronization, use the show ptp clock <n> state command as given in the following example:
Router# show ptp clock 0 statistics
 AprState    7  :
           2@0-01:12:30.128          1@0-01:11:03.722          3@0-00:31:02.762
           2@0-00:06:42.742          1@0-00:06:23.496          0@0-00:05:25.894
           4@0-00:05:07.269
 ClockState  3  :
           3@0-00:06:50.180          2@0-00:06:43.180          1@0-00:06:42.697
 BstPktStrm  1  :
           0@0-00:05:01.875
 SetTime     1  :
  1000000000@0-00:05:05.337
 StepTime    1  :
    72273313@0-00:05:57.337
 AdjustTime  124        :
        -312@0-03:06:25.962          3@0-03:05:24.961        -50@0-03:04:23.961
         238@0-03:03:22.961         19@0-03:02:21.961       -106@0-03:01:20.961
         -48@0-03:00:19.961        211@0-02:59:18.961         54@0-02:58:17.962
streamId  msgType           rx          rxProcessed     lost        tx
 0        SYNC              41030       41030           0           0
 0        DELAY REQUEST     0           0               0           41031
 0        P-DELAY REQUEST   0           0               0           0
 0        P-DELAY RESPONSE  0           0               0           0
 0        FOLLOW UP         0           0               0           0
 0        DELAY RESPONSE    41028       41028           4294891017  0
 0        P-DELAY FOLLOWUP  0           0               0           0
 0        ANNOUNCE          2565        2565            0           0
0        SIGNALING         27          27              0           27
 0        MANAGEMENT        0           0               0           0
   TOTAL                    84650       84650           4294891017  41058
 2        SYNC              40980       40980           0           0
 2        DELAY REQUEST     0           0               0           40981
 2        P-DELAY REQUEST   0           0               0           0
 2        P-DELAY RESPONSE  0           0               0           0
 2        FOLLOW UP         0           0               0           0
 2        DELAY RESPONSE    40608       40608           4294891243  0
 2        P-DELAY FOLLOWUP  0           0               0           0
 2        ANNOUNCE          2561        2561            0           0
 2        SIGNALING         27          27              0           27
 2        MANAGEMENT        0           0               0           0
   TOTAL                    84176       84176           4294891243  41008
 4        SYNC              41074       41074           0           0
 4        DELAY REQUEST     0           0               0           41074
 4        P-DELAY REQUEST   0           0               0           0
 4        P-DELAY RESPONSE  0           0               0           0
4        FOLLOW UP         0           0               0           0
 4        DELAY RESPONSE    41072       41072           4294891140  0
 4        P-DELAY FOLLOWUP  0           0               0           0
 4        ANNOUNCE          2567        2567            0           0
 4        SIGNALING         27          27              0           27
 4        MANAGEMENT        0           0               0           0
   TOTAL                    84740       84740           4294891140  41101
 6        SYNC              0           0               0           0
 6        DELAY REQUEST     0           0               0           0
 6        P-DELAY REQUEST   0           0               0           0
 6        P-DELAY RESPONSE  0           0               0           0
 6        FOLLOW UP         0           0               0           0
 6        DELAY RESPONSE    0           0               0           0
 6        P-DELAY FOLLOWUP  0           0               0           0
 6        ANNOUNCE          2609        2609            0           0
 6        SIGNALING         9           9               0           9
 6        MANAGEMENT        0           0               0           0
   TOTAL                    2618        2618            0           9
 8        SYNC              40902       40902           0           0
 8        DELAY REQUEST     0           0               0           40903
 8        P-DELAY REQUEST   0           0               0           0
 8        P-DELAY RESPONSE  0           0               0           0
 8        FOLLOW UP         0           0               0           0
 8        DELAY RESPONSE    38773       38773           4294892784  0
 8        P-DELAY FOLLOWUP  0           0               0           0
 8        ANNOUNCE          2556        2556            0           0
 8        SIGNALING         27          27              0           27
 8        MANAGEMENT        0           0               0           0
   TOTAL                    82258       82258           4294892784  40930
 10       SYNC              0           0               0           0
 10       DELAY REQUEST     0           0               0           0
 10       P-DELAY REQUEST   0           0               0           0
 10       P-DELAY RESPONSE  0           0               0           0
 10       FOLLOW UP         0           0               0           0
 10       DELAY RESPONSE    0           0               0           0
 10       P-DELAY FOLLOWUP  0           0               0           0
 10       ANNOUNCE          2598        2598            0           0
 10       SIGNALING         9           9               0           9
 10       MANAGEMENT        0           0               0           0
   TOTAL                    2607        2607            0           9

Configuration Examples

This section provides examples for configuring Cisco cBR for time synchronization.

Example: Configuring Time Interface and PTP Domain

The following example shows how to configure time interface and PTP domain:
enable
configure terminal 
interface Loopback1588
ip address 100.100.100.40 255.255.255.255

interface TenGigabitEthernet4/1/7.1 (connect to PTP master) 
ip address 100.100.10.92 255.255.255.0
route 10.10.10.11 255.255.255.224 192.168.0.12 (route to PTP master loopback ip) 
ptp clock ordinary domain 55 (This is for cbr ptp connection)
 servo tracking-type R-DTI
 clock-port slave-from-903 slave 
 delay-req interval -4
 sync interval -5 
 sync one-step
 transport ipv4 unicast interface Lo1588 negotiation 
 clock source 10.10.1.11 (PTP master loopback ip)

Example: Configure RPD PTP Connection

The following example shows how to configure RPD PTP connection:
enable
configure terminal
ptp r-dti 20
profile G.8275.2
ptp-domain 0
 mode slave
 priority1 128
 priority2 255
 local-priority 128
 clock-port 1
   ethernet 1
   …
 clock-port 2
   ethernet 2
   …
clock-port 1
   ethernet 1
   state up
   transport ipv4
   clock source ip 10.10.1.12 gw 10.10.1.1 
    clock source ip 192.168.0.0 gateway ip 10.10.1.2 alternate
   transport cos 6
   transport dscp 47
   sync interval -4
   announce interval 0
   announce timeout 11
   delay-req interval -4
   unicast grant-duration 300
   local-priority 128

Example: Associate R-DTI with RPD

The following example shows how to associate R-DTI with RPD:
enable
configure terminal
cable rpd node1
 identifier badb.ad17.4820 (node vbh0 mac) 
 core-interface Te7/1/4
  rpd-ds 0 downstream-cable 7/0/16 profile 0
  rpd-us 0 upstream-cable 7/0/16 profile 0
 r-dti 20
 rpd-event profile 0

Feature Information for Synchronizing Time on Cisco Remote PHY Shelf 7200


Note

The following table lists the software release in which a given feature is introduced. Unless noted otherwise, subsequent releases of that software release train also support that feature.

Table 3. Feature Information for Synchronizing Time on Cisco Remote PHY Shelf 7200

Feature Name

Releases

Feature Information

Synchronizing Time

Cisco Remote PHY Shelf 7200 Software 1.1

This feature was introduced on the Cisco Remote PHY Shelf 7200 .