interface disconnects instantly nexus 3064

[SNTX]

Hi, since I replaced my switch with a Nexus3064 I have a problem with DWDM networks I connect to this one. when there is a fiber cut interface disconnects instantly and create a flap of 2 seconds. DWDM network need 200ms for change master circuit to slave one but nexus disconnect interface when dont see signal and create a problem.

I dont find any commands about this timer. Before we used a CCR0172 for router/switch these DWDM networks and never had this problem.

L2 provider tells me that need a hold timer in the interface for avoid  instantly disconnection of interface.

Someone had this problem before?

thank you and good work.

here it the log about the interface

2022 Jul 3 22:07:50 NX02 %ETHPORT-5-IF_DOWN_LINK_FAILURE: Interface Ethernet1/6 is down (Link failure)
2022 Jul 3 22:07:54 NX02 last message repeated 1 time
2022 Jul 3 22:07:54 NX02 %ETHPORT-5-SPEED: Interface Ethernet1/6, operational speed changed to 10 Gbps
2022 Jul 3 22:07:54 NX02 %ETHPORT-5-IF_DUPLEX: Interface Ethernet1/6, operational duplex mode changed to Full
2022 Jul 3 22:07:54 NX02 %ETHPORT-5-IF_RX_FLOW_CONTROL: Interface Ethernet1/6, operational Receive Flow Control state changed to off
2022 Jul 3 22:07:54 NX02 %ETHPORT-5-IF_TX_FLOW_CONTROL: Interface Ethernet1/6, operational Transmit Flow Control state changed to off
2022 Jul 3 22:07:54 NX02 %ETHPORT-5-IF_UP: Interface Ethernet1/6 is up in mode trunk

[balaji.bandi]

Not sure what is delivery MM or single mode here ? what SFP Model is this ? - Most cased up and down immediatly cause of wrong patch cables.

may be the command you looking check below : (not if that help).

link debounce

To enable the debounce timer on an interface, use the link debounce command in the interface configuration mode. Use the no form of the command to set the link debounce timer to a default value of 100 milliseconds.

link debounce [link-up] [ time milliseconds ]

no link debounce [link-up] [ time milliseconds ]

[SNTX]

10G monomode fiber  in DWDM service L2.

modules is FS SFP-10GLR-31

try this command but doesnt change.

thank you

[balaji.bandi]

10G monomode fiber  in DWDM service L2.

i take this as you using Mumtil Mode ( Blue ot Aqua cable ?)

FS SFP-10GLR-31

This need SMF right ?

https://www.fs.com/uk/products/11591.html

[SNTX]

Hi patch cable are all yellow. We are in a Internet exchange and all connections are do by them.

Yes optical are for SingleMode Fiber

[balaji.bandi]

ok now post below information :

show version

show interface ethenet x/x

show run interface ethernet x/x

[SNTX]

show version

Software
BIOS: version 2.8.0
loader: version N/A
kickstart: version 6.0(2)U6(7)
system: version 6.0(2)U6(7)
Power Sequencer Firmware:
Module 1: version v1.0
SFP uC: version 2.12
BIOS compile time: 12/22/2015
kickstart image file is: bootflash:///n3000-uk9-kickstart.6.0.2.U6.7.bin
kickstart compile time: 7/28/2016 9:00:00 [07/28/2016 16:40:23]
system image file is: bootflash:///n3000-uk9.6.0.2.U6.7.bin
system compile time: 7/28/2016 9:00:00 [07/28/2016 17:12:38]

Hardware
cisco Nexus 3064 Chassis ("48x10GE + 4x40G Supervisor")
Intel(R) Celeron(R) CPU P4505 @ 1.87GHz with 3665240 kB of memory.
Processor Board ID FOC1814AG1Q

show int

Dedicated Interface
Hardware: 100/1000/10000 Ethernet, address: 885a.92de.75cd (bia 885a.92de.75cd)
MTU 9216 bytes, BW 10000000 Kbit, DLY 10 usec
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA
Port mode is trunk
full-duplex, 10 Gb/s, media type is 10G
Beacon is turned off
Input flow-control is off, output flow-control is off

Rate mode is dedicated
Switchport monitor is off
EtherType is 0x8100
Last link flapped 13:39:53
Last clearing of "show interface" counters never
324 interface resets

!Command: show running-config interface Ethernet1/6
!Time: Mon Jul 4 12:48:50 2022

version 6.0(2)U6(7)

interface Ethernet1/6
switchport mode trunk
switchport trunk allowed vlan 2911-2912,3400,3911-3912
duplex full
no shutdown

[Georg Pauwen]

Hello,

what configuration did you use on the CCR0172 ?

[SNTX]

hi no config about the interface just 10G port with an ip on the vlan assign.

Provider tells me:

When there is an outage on spare or main route, fault there is triggering protection switch, so protection is working, but can not be set to revertive due to LOS respond from your ports, so the service will stay where it currently is.
The only way to trigger protection switch is to lockout spare route (say to system to not use it).

In summary, protection is working when fault will on main (will switch to spare) or on spare (will switch to main), but the service will stay there and can not manually or auto revert back to main unless spare will be locked, due to LOS from your ports.

Please, escalate this to your vendor to advise why your ports are ending LOS in case of sub 50ms flap due to protection switch.

They should be able to advise how to increase “carrier-delay down” time on your ports in order to not send LOS during protection switch (sub 50ms flaps).

thank you

[marce1000]

           - Check interface (error)-counters.

 M.

[SNTX]

[marce1000]

 - Ref : https://www.cisco.com/c/en/us/support/docs/ios-nx-os-software/nx-os-software/217554-understand-cyclic-redundancy-check-crc.html

 >...

CRC errors can also manifest themselves as a non-zero “FCS-Err” counter in the output of show interface counters errors. The "Rcv-Err" counter in the output of this command will also have a non-zero value, which is the sum of all input errors (CRC or otherwise) received by the interface.

M.

[SNTX]

i try to use "delay" command

https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5500/sw/interfaces/command/cisco_nexus5500_interfaces_command_ref/d_commands.pdf

but doesnt work

[KonakL]

Hello,

Could you please share how did you solve this issue?

Thank You!