Stuck on ASR9K PTP Configuration

[dmendesptd]

Hi all, I'm sort of stumped with our PTP configuration and looking for some advice.

We're using a Microsemi TP5000 Time Server as our dedicated GM, which references GNSS for its time. It's configured to use the g8265.1 unicast profile on domain 10, and I have no issues pointing devices to it's ipv4 listening address as slaves.

Since the TP5K only supports 1000 direct clients, I'm tasked to scale this out to some of our 9Ks to act as master clocks so everything isn't pointed to the TP5K directly. Here's a basic topology:

[GNSS]--[TP5000]----[ASR9000]----[ASR920]

Presently, the ASR9000 and ASR920 are direct slaves of the TP5000 and PHASE_LOCKED. However, in this case, I only want the ASR9000 peered directly with the TP5000 and distributing PTP downward to the ASR920 and other devices.

Here's what my current configuration looks like:

TP5000 - 10.99.1.1

ASR9000 - 10.88.1.1

ASR920 - 10.77.1.1

TP5000

Listening on IPv4 10.99.1.1, g8265.1, domain 10

ASR9000

ptp
 clock
  domain 10
  profile g.8265.1
  time-source PTP
 !

 profile ptp-gm-slave
  transport ipv4
  master ipv4 10.99.1.1
  !

interface TenGigE0/0/0/0
 ptp
  profile ptp-gm-slave
 !
 ipv4 address 10.88.1.1/24
!

RP/0/RSP0/CPU0:ASR9000#show frequency synchronization selection
Node 0/RSP0/CPU0:
==============
Selection point: T0-SEL-B (2 inputs, 1 selected)
  Last programmed 21:28:29 ago, and selection made 21:28:25 ago
  Next selection points
    SPA scoped    : None
    Node scoped   : T4-SEL-C CHASSIS-TOD-SEL
    Chassis scoped: LC_TX_SELECT
    Router scoped : None
  Uses frequency selection
  Used for local line interface output
  S  Input                     Last Selection Point         QL  Pri  Status
  == ========================  ========================  =====  ===  ===========
  1  PTP [0/RSP0/CPU0]         n/a                         PRC  254  Locked
     Internal0 [0/RSP0/CPU0]   n/a                         SEC  255  Available

ASR920

ptp clock ordinary domain 10
 tod R0 cisco
 clock-port slave slave profile g8265.1
  transport ipv4 unicast interface Lo0 negotiation
  clock source 10.99.1.1

ASR920#show ptp clock running



                      PTP Ordinary Clock [Domain 10]

         State          Ports          Pkts sent      Pkts rcvd      Redundancy Mode

         PHASE_ALIGNED  1              43651          132319         Hot standby

                               PORT SUMMARY
                                                                       PTP Master
Name  Tx Mode      Role         Transport    State        Sessions     Port Addr

slave unicast      slave        Lo0          Slave        1            10.99.1.1

How do I configure 10.88.1.1 to be a master to 10.77.1.1?

Thanks-

[xr-escalation · Accepted solution]

Just check show ptp platform servo to ensure PTP is phase locked.


[GNSS]--[TP5000]----[ASR9000]----[ASR920]

As per your configuration you have configured port TenGigE0/0/0/0 as slave interface.
So you need to configure another interface which is connected to ASR920 from ASR9000 as PTP master.

Master config will be something like this:

RP/0/0/CPU0:ios#conf RP/0/0/CPU0:ios(config)#ptp RP/0/0/CPU0:ios(config-ptp)#clock RP/0/0/CPU0:ios(config-ptp-clock)#domain 4 RP/0/0/CPU0:ios(config-ptp-clock)#profile g.8265.1 RP/0/0/CPU0:ios(config)#interface TengigE 0/0/0/0 RP/0/0/CPU0:ios(config-int)#ipv4 address 10.0.0.1/24 RP/0/0/CPU0:ios(config-int)#ptp RP/0/0/CPU0:ios(config-int-ptp)#unicast-grant invalid-request deny RP/0/0/CPU0:ios(config-int-ptp)#port state master-only

Or you can configure a master profile and apply to the interface.

[dmendesptd]

Thanks, I will work with the suggestions provided and report back with any further questions.