nexus 5020 and PTP

[christophrisch]

Hi,
i try to use a nexus 5020 for voip applications. in my case with dante devices.
After approximately 3 minutes it seems to be the nexus switch is filtering all PTP packets and the VOIP/Dante devices are loosing sync.

system: version 5.2(1)N1(9a)

best regards
Christoph

[Rick1776]

Can you share the configuration?

[christophrisch]

Hi Rick,

i hope this is the information you need.

I got some basic knowledge of iOS,  nx os is something new for me.

My intention is to use this older hardware for a Voip project.

best regards

Christoph

sh run

!Command: show running-config
!Time: Wed Nov 29 17:06:04 2017

version 5.2(1)N1(9a)
feature fcoe

hostname n5k

system default switchport trunk mode auto
feature telnet
feature http-server
feature interface-vlan
feature lacp
feature lldp
feature fex

username admin password . role network-admin

banner motd #Nexus 5000 Switch
#

ip domain-lookup
fex 100
pinning max-links 1
description "FEX0100"
snmp-server user admin network-admin auth
priv  localizedkey
ntp server 192.168.5.2 use-vrf management

vrf context management
ip route 0.0.0.0/0 192.168.5.1
vlan configuration 1
vlan 1
port-profile default max-ports 512

interface Vlan1
ip address 192.168.5.221/24

interface port-channel100
switchport mode fex-fabric
fex associate 100

interface fc2/1

interface fc2/2

interface fc2/3

interface fc2/4

interface fc2/5

interface fc2/6

interface fc3/1

interface fc3/2

interface fc3/3

interface fc3/4

interface fc3/5

interface fc3/6

interface Ethernet1/1
switchport mode fex-fabric
fex associate 100
channel-group 100

interface Ethernet1/2
switchport mode fex-fabric
fex associate 100
channel-group 100

interface Ethernet1/3
switchport mode fex-fabric
fex associate 100
channel-group 100

interface Ethernet1/4
switchport mode fex-fabric
fex associate 100
channel-group 100

interface Ethernet1/5

interface Ethernet1/6

interface Ethernet1/7

interface Ethernet1/8

interface Ethernet1/9

interface Ethernet1/10

interface Ethernet1/11

interface Ethernet1/12

interface Ethernet1/13

interface Ethernet1/14

interface Ethernet1/15

interface Ethernet1/16

interface Ethernet1/17

interface Ethernet1/18

interface Ethernet1/19

interface Ethernet1/20

interface Ethernet1/21

interface Ethernet1/22

interface Ethernet1/23

interface Ethernet1/24

interface Ethernet1/25

interface Ethernet1/26

interface Ethernet1/27

interface Ethernet1/28

interface Ethernet1/29

interface Ethernet1/30

interface Ethernet1/31

interface Ethernet1/32

interface Ethernet1/33

interface Ethernet1/34

interface Ethernet1/35

interface Ethernet1/36

interface Ethernet1/37

interface Ethernet1/38

interface Ethernet1/39

interface Ethernet1/40

interface mgmt0
ip address 192.168.5.200/24

interface Ethernet100/1/1

interface Ethernet100/1/2

interface Ethernet100/1/3

interface Ethernet100/1/4

interface Ethernet100/1/5

interface Ethernet100/1/6

interface Ethernet100/1/7

interface Ethernet100/1/8

interface Ethernet100/1/9

interface Ethernet100/1/10

interface Ethernet100/1/11

interface Ethernet100/1/12

interface Ethernet100/1/13

interface Ethernet100/1/14

interface Ethernet100/1/15

interface Ethernet100/1/16

interface Ethernet100/1/17

interface Ethernet100/1/18

interface Ethernet100/1/19

interface Ethernet100/1/20

interface Ethernet100/1/21

interface Ethernet100/1/22

interface Ethernet100/1/23

interface Ethernet100/1/24

interface Ethernet100/1/25

interface Ethernet100/1/26

interface Ethernet100/1/27

interface Ethernet100/1/28

interface Ethernet100/1/29

interface Ethernet100/1/30

interface Ethernet100/1/31

interface Ethernet100/1/32
system default zone default-zone permit
system default zone distribute full
line console
line vty
boot kickstart bootflash:/n5000-uk9-kickstart.5.2.1.N1.9a.bin
boot system bootflash:/n5000-uk9.5.2.1.N1.9a.bin
interface fc2/1
interface fc2/2
interface fc2/3
interface fc2/4
interface fc2/5
interface fc2/6
interface fc3/1
interface fc3/2
interface fc3/3
interface fc3/4
interface fc3/5
interface fc3/6

[Rick1776]

I don’t see ptp enabled. you would see “feature ptp” and “ ptp source xxx.xxx.xxx.xxx”

Do you have a ptp server you need to point to?

[christophrisch]

So i always need to activate the ptp feature and to define a ptp server.
If not the system will filter the ptp packets?
I already read about this topic on the cisco website.

iI think this message is part of my problem:

n5k(config)# feature ptp
ERROR: Feature PTP cannot be enabled in this platform.
n5k(config)#

Could it be a license problem?

best regards
Christoph

[Wes Austin]

The Nexus requires L3 capabilities in order to support PTP.

PTP cannot be enabled on N5K-5020/5010.

[Rick1776]

Bummer, can you enable NTP

[christophrisch]

Hi Wes,

that could be the solution. No layer 3 capabilities no ptp. 

Thanks!

[Rick1776]

PTP you don’t need a license so that’s strange. Can you send the output from “show feature”

[christophrisch]

NTP is enabled

n5k(config)# sh feature
Feature Name Instance State
-------------------- -------- --------
Flexlink 1 disabled
amt 1 disabled
bgp 1 disabled
cts 1 disabled
dhcp 1 disabled
dot1x 1 disabled
eigrp 1 disabled
eigrp 2 disabled
eigrp 3 disabled
eigrp 4 disabled
eth_port_sec 1 disabled
fabric-binding 1 disabled
fc-port-security 1 disabled
fcoe 1 enabled
fcoe-npv 1 disabled
fcsp 1 disabled
fex 1 enabled
fport-channel-trunk 1 disabled
glbp 1 disabled
hsrp_engine 1 disabled
http-server 1 enabled
interface-vlan 1 enabled
lacp 1 enabled
ldap 1 disabled
lldp 1 enabled
msdp 1 disabled
npiv 1 disabled
npv 1 disabled
oim 1 disabled
ospf 1 disabled
ospf 2 disabled
ospf 3 disabled
ospf 4 disabled
ospfv3 1 disabled
ospfv3 2 disabled
ospfv3 3 disabled
ospfv3 4 disabled
pim 1 disabled
pim6 1 disabled
poe 1 disabled
port_track 1 disabled
private-vlan 1 disabled
privilege 1 disabled
ptp 1 disabled
rip 1 disabled
rip 2 disabled
rip 3 disabled
rip 4 disabled
sshServer 1 enabled
tacacs 1 disabled
telnetServer 1 enabled
udld 1 disabled
vem 1 disabled
vpc 1 disabled
vrrp 1 disabled
vtp 1 disabled

[Rick1776]

Here is the guide for configuration of NTP
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5500/sw/system_management/6x/b_5500_System_Mgmt_Config_6x/b_5500_System_Mgmt_Config_6x_chapter_010010.html#d46521e421a1635

[Rick1776]

Is this a voip service you subscribe to?

[christophrisch]

I try to use this hardware for a audio over ip network called dante.
Dante is usual for professional audio applications.

[Rick1776]

Do they have a natp server you can sync with? I would ask them. As MoH is very dependent on sync.

[christophrisch]

Well, i try to explain how this audio network works. Sorry, my technical english isnt good.
The devices elect their master clock either by best quality or by maunal defining of a master device. So there is no dedicated ptp clock.
however, this sync is working for about approximately 3 minutes. Then the devices are out of sync. I recorded the traffic with wireshark and i recognized that the ptp v1 packets were removed after some minutes.
Thats why i belive this nexus is filtering something.
So i tried to create a simple configuration with only one fex and no qos.