Timestamp Tagging (TTAG) on N9K configuration

[GL_kz]

Hi,

We are trying to configure TTAG on N9K-C93180-YC-EX running version 9.3.7 and it doesn't work.

PTP is configured properly and the N9K get the time from the PTP server.

With the configuration below, we can ping between the end points but we don't see the time stamp (probably because of the command ttag-strip).

interface Eth1/1
ttag
ttag-marker enable
ttag-strip
switchport
switchport access vlan 10
spanning-tree port type edge
no shutdown
!
interface Eth1/2
ttag
ttag-marker enable
ttag-strip
switchport
switchport access vlan 10
spanning-tree port type edge
no shutdown
!
interface Eth1/3
desc To-PTP-Server
ptp
ttag
switchport
switchport access vlan 10
spanning-tree port type edge
no shutdown
!
interface Eth1/5
desc To-Wireshark
switchport
switchport monitor

When configured as follows, we can't ping between the endpoints, and of course we also don't see the ttag.

interface Eth1/1
ttag
ttag-marker enable
switchport
switchport access vlan 10
spanning-tree port type edge
no shutdown
!
interface Eth1/2
ttag
ttag-marker enable
switchport
switchport access vlan 10
spanning-tree port type edge
no shutdown
!
interface Eth1/3
desc To-PTP-Server
ptp
ttag
switchport
switchport access vlan 10
spanning-tree port type edge
no shutdown
!
interface Eth1/5
desc To-Wireshark
switchport
switchport monitor

Anyone has any experience with configuring ttag and might have any suggestion?

Please advise,

[marce1000]

 - Check these bug reports . some of  them could be applicable to your case :

               https://bst.cloudapps.cisco.com/bugsearch/search?kw=ttag%20nexus%209000&pf=prdNm&sb=anfr

 M.

[GL_kz]

Hi Marce,

Thank you for your reply.

I've checked the bugs and didn't find one that seems to match.

Our setup is very simple and consist of single N9K, connected to 3 endpoint and one PTP server.

The configuration is also very simple and consist of a single VLAN, no VXLAN or routing.

Any idea regarding the correct configuration for ttag? maybe we are missing something simple.

[kaiyong]

You must configure 

mac-learning disable 

for that VLAN.

vlan configuration 10 

 mac-learning disable

Then it will work