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hardware:alista:ptp



Arista PTP Configuration Examples

knowledge


PTP Configuration

How to configure PTP (in Boundary Clock) and Status Commands

Global Configuration
localhost(config)#ptp mode boundary
localhost(config)#ptp domain 127     (or other value, which must match the domain on the GM)
localhost(config)#ptp source ip <ip address>    (create a Loopback address and define this as the source IP - thereby a unique IP address of the system matches the PTP Source IP)
localhost(config)#ptp ttl 32   (or other value, default is 1)


Slave (Per Interface Connected to a Non-Slave Device)

On interface level, L2 or L3, or port-channel,

localhost(config-if-Et1)#ptp enable
localhost(config-if-Et1)#ptp announce interval 0
localhost(config-if-Et1)#ptp sync interval -3
localhost(config-if-Et1)#ptp delay-req interval -3


Master (Per Interface Connected to a Slave Device)
localhost(config-if-Et1)#ptp enable
localhost(config-if-Et1)#ptp announce interval 0
localhost(config-if-Et1)#ptp sync interval -3
localhost(config-if-Et1)#ptp delay-req interval -3
localhost(config-if-Et1)#ptp role master


Useful Status Commands and Outputs

show ptp

displays which interfaces are in the following modes: Master, Slave, Passive, Disabled ; Grandmaster ID, # steps away from GM, etc

switch#show ptp
PTP Mode: gptp - Generalized PTP Clock
Clock Identity: 2001:0DB8:73:ff:ff:26:fd:90
Grandmaster Clock Identity: 2001:0DB8:96:ff:fe:6c:ed:02
Number of slave ports: 1
Number of master ports: 6
Slave port: Ethernet33
Mean Path Delay (nanoseconds): 718
Steps Removed: 1
Neighbor Rate Ratio: 1.00000007883
Rate Ratio: 1.00000007883
Interface State    AS      Time Since Last    Neighbor    Mean Path   Residence
                   Capable Changed            Rate Ratio  Delay (ns)  Time (ms)
--------- -------- ------- ------------------ ----------- ----------- ---------
Et1       Disabled No      Never              1.0         0           0
Et2       Disabled No      Never              1.0         0           0
Et3       Disabled No      Never              1.0         0           0
Et4       Disabled No      Never              1.0         0           0
Et5       Disabled No      Never              1.0         0           0
Et6       Disabled No      Never              1.0         0           0
Et7       Master   Yes     0:21:08            1.00000009  420         0
<-------OUTPUT OMITTED FROM EXAMPLE--------> 


show ptp masters (show ptp parent)

displays ID and parameters of PTP parent

show ptp masters
show ptp parent


show ptp local-clock (show ptp clock)

To displa the local PTP clock and offset.
similar to ‘show ptp’

show ptp local-clock
show ptp clock


show ptp interface

To display PTP information for specified interfaces, use the show ptp interface command.

switch# show ptp interface
Interface Ethernet1
PTP: Disabled
Port state: Disabled
Sync interval: 1.0 seconds
Announce interval: 2.0 seconds
Announce interval timeout multiplier: 3
Delay mechanism: end to end
Delay request message interval: 32.0 seconds
Transport mode: ipv4
 
Interface Ethernet5
PTP: Disabled
Port state: Disabled
Sync interval: 8.0 seconds
Announce interval: 2.0 seconds
Announce interval timeout multiplier: 5
Delay mechanism: peer to peer
Peer delay request message interval: 8.0 seconds
Peer Mean Path Delay: 0
Transport mode: ipv4
<-------OUTPUT OMITTED FROM EXAMPLE--------> 
switch#


show ptp interface ethernet

displays counters of required PTP messages, such as sync messages sent/received, delay-req sent/received

show ptp interface ethernet 3


show ptp monitor

displays up to 100 entries of offset from master, mean path delay, and skew

Switch# show ptp monitor
PTP Mode: Boundary Clock
Ptp monitoring: enabled
Number of entries: 5
Offset from master threshold: 1500
Mean path delay threshold: not configured
Skew threshold: 0.5
Interface  Time                          Offset from   Mean Path    Skew
                                         Master (ns)   Delay (ns)
---------- ----------------------------- ------------ ------------- -----------
Et8        21:23:12.901 UTC Feb 22 2018  71            5849         1.003159918
Et1        21:23:12.901 UTC Feb 22 2018  113           3672         1.004990621
Et2        21:23:12.901 UTC Feb 22 2018  706           7799         1.002744199
Et1        21:23:12.901 UTC Feb 22 2018  803           5861         1.003432049
Et1        21:23:12.901 UTC Feb 22 2018  610           3415         0.998974658







hardware/alista/ptp.txt · Last modified: 2021/03/01 by admin

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