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[PTX] ILA shows 'OSC a/b Output disable' even though OSC is functioning normally after a 'soft reboot'

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Article ID: KB33482 KB Last Updated: 31 Mar 2020Version: 2.0
Summary:

Optical inline amplifiers (ILA) can be managed over the optical supervisory channel (OSC) of the PTX3000 integrated photonic line card (IPLC). The OSC status for both sides [a] and [b] of an ILA is shown as disable in some situations. There are two OSCs (a and b) on an optical ILA. However, the actual OSC power levels are normal. The OSC is functioning normally, and the ILA operation itself is normal.

This article explains that the issue is cosmetic and suggests a way to correct it.

 

Symptoms:

In the topology below, there are four ILAs (InLine Amplifier) installed in between two PTX3000 routers.

ILA1/2/4 are showing 'OSC a/b Output enable' correctly, but only ILA3 is showing 'OSC a/b Output disable'.

PTX3000-1----[a]ILA1[b]----[a]ILA2[b]-----[a]ILA3[b-----[a]ILA4[b]----PTX3000-2

ILA1/2/4

BPS->show osc a output
OSC a Output enable

BPS->show osc b output
OSC b Output enable

ILA3
BPS->show osc a output
OSC a Output disable <-- problem

BPS->show osc b output
OSC b Output disable <-- problem

 

Cause:

This issue is caused by the reboot soft operation command on the ILA.

BPS->show osc a output
OSC a Output enable

BPS->show osc b output
OSC b Output enable

BPS -> reboot soft

Do you want to continue (y/n) [n] :y
INIT: Switching to runlevel: 6
INIT: Sending processes the TERM signal
Stopping OpenBSD Secure Shell server: sshdstopped /usr/sbin/sshd (pid 729)
.
Stopping Postfix...postfix/postfix-script: stopping the Postfix mail system
Successful
* Stopping Avahi mDNS/DNS-SD Daemon: avahi-daemon [ ok ]
Stopping Advanced Configuration and Power Interface daemon: stopped /usr/sbin/acpid (pid 767)
acpid.
Stopping domain name service: named.
Stopping system message bus: dbus.
-snip-

Welcome to ILA World

BPS>login
Username: root
Password: *********

Completed!

BPS->

BPS->show osc a output
OSC a Output disable  

Completed!

BPS->show osc b output
OSC b Output disable  

Completed!

 

Solution:

This cosmetic issue can be fixed by setting ILA3's ila mode to manual, and reverting it to auto. The oscEnable status is changed from Disabled to Enabled

The default ILA mode is Auto. Changing ILA mode does not have any traffic impact.

Before

--------------------
BPS->show osc a output
OSC a Output disable

BPS->show osc b output
OSC b Output disable
--------------------

User@PTX3000-1> show chassis fpc optical-properties amplifier-chain ila osc fpc-slot 15 ila-number 3
ILA OSC-A Information
oscIndex                            1
Manufacture information node        ILA OSC-A Information
oscEnable                           Disabled
oscAddPowerValue (0.01dBm)          126
oscDropPowerValue (0.01dBm)         -2383
oscAddLOSThreshold (0.01dBm)        0
oscDropLOSThreshold (0.01dBm)       0
ILA OSC-B Information
oscIndex                            2
Manufacture information node        ILA OSC-B Information
oscEnable                           Disabled 
oscAddPowerValue (0.01dBm)          143
oscDropPowerValue (0.01dBm)         -2019
oscAddLOSThreshold (0.01dBm)        0
oscDropLOSThreshold (0.01dBm)       0

BPS -> show ila-mode
Ila Auto Mode
Completed!

BPS -> set ila-mode manual
Completed!

BPS -> set ila-mode auto
Completed!

BPS->show ila-mode
Ila Auto Mode
Completed!

After

--------------------
BPS -> show osc a output
OSC a Output enable

BPS -> show osc b output
OSC b Output enable
--------------------

User@PTX3000-1> show chassis fpc optical-properties amplifier-chain ila osc fpc-slot 15 ila-number 3
ILA OSC-A Information
oscIndex                            1
Manufacture information node        ILA OSC-A Information
oscEnable                           Enabled
oscAddPowerValue (0.01dBm)          126
oscDropPowerValue (0.01dBm)         -2383
oscAddLOSThreshold (0.01dBm)        -150
oscDropLOSThreshold (0.01dBm)       -4350
ILA OSC-B Information
oscIndex                            2
Manufacture information node        ILA OSC-B Information
oscEnable                           Enabled
oscAddPowerValue (0.01dBm)          139
oscDropPowerValue (0.01dBm)         -2019
oscAddLOSThreshold (0.01dBm)        -150
oscDropLOSThreshold (0.01dBm)       -4350

 

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