diego_garcia_del_rio's profile

154 Messages

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2.7K Points

Wed, Apr 7, 2021 10:32 PM

Optical monitoring not possible on ports with link down?

Am I missing something or the optical monitoring only works when the link is up? I am trying to troubleshoot some fiber connections which were unreliable / not coming up and when I use the `show optical-monitor x/y/z` command, I get nothing. Just comes back to the prompt.

If the same port with the same optical module has link, then I do get a proper readout of the optical monitor command (tx power / rx power / temps / current).

Being able to monitor a non-working link is a pretty basic thing to do to be honest and having access to DDM/DOM/optical monitoring of down links lets you figure out if you have, for example, a broken fiber in one direction, a mis-plugged rx/tx pair, etc.

Is there any way to monitor the DDM/optical parameters while the link is down?

Thanks in advance!

Accepted Solution

Official Rep

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137 Messages

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4.2K Points

8 m ago

Hi Diego,

The optical monitor shows signal levels, but will only show statistics if the port is up:

device(config)# show optic 2/1/1
Port Temperature Tx Power Rx Power Tx Bias Current
+-----+-------------+-------------+--------------+---------------------+
2/1/1 32.2578 C -002.5157 dBm -002.8091 dBm 5.966 mA
Normal Normal Normal Normal

If Signal is not correct and media type and fiber not right type link will not come up.
You need to check show media e x/y/z on both side make sure fiber is of right type.


Hope this helps.

If you need further help please open a  ticket and work with our TAC team.

https://support.ruckuswireless.com/contact-us

Thanks

Hahsim

154 Messages

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2.7K Points

Hi Hashim,

thanks. Its not really useful to be honest, as in my case, the media matches on both ends but the link is not coming up. Especially when running a link across campus, you can't always trust the fiber plant (As its my case at the moment)

On other vendor's switches I was always able to show DOM/DDM/optical-monitoring parameters for ports in down state which can help a lot to troubleshoot why the link is not working.

In fact, one would argue that there is very little use for DOM when the link is up and ok. If my interface is not coming up because my RX power is too low, I want to be able to see that.

Thanks in advance

Official Rep

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137 Messages

 • 

4.2K Points

8 m ago

Hi Diego,

The optical monitor shows the signal.  If port is down it will not display the signal.

You can use show media x/t/z and show int e x/y/z  for the port in question.

Please paste the above two outputs, as well as show version show mod and show license for your switch.

Thanks

Hashim

154 Messages

 • 

2.7K Points

8 m ago

Hi Hashim,

As I mentioned before, I have used this exact feature on other vendors (with link down I mean). I can see, for example, rx power for an un-plugged optic at -40dbm for example. Which pinpoints to a broken fiber for example or a reversed rx-tx pair.

Also its very useful when a link is on the verge of working / not working like when you have too much attenuation on the link

For example, if my link is flapping becasue im at -14 / -15 dbm.. i can only see that if I get to catch the "show optic" command at exactly the time that the link is up.

Or, if im having issues with a link, seeing its voltage or temperature can be a  very helpful troubleshooting step.

I will try to get the show commands asked for tomorrow.

But it feels like I'll have to open an RFE to see if it will be possible to get it in a future release.

Official Rep

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137 Messages

 • 

4.2K Points

8 m ago

Hi Diego,

Like i said working as designed here is a lab snippet:


CORE-ICX-7850-10G(config)#sh optic  2/1/20
 Port   Temperature    Voltage       Tx Power      Rx Power    Tx Bias Current
+-----+-------------+-------------+-------------+-------------+---------------+
2/1/20   20.0468 C    3.2566 volts  -002.4336 dBm   -003.2605 dBm     5.600 mA
        Normal          Normal       Normal         Normal         Normal


CORE-ICX-7850-10G(config)#int e 2/1/20
CORE-ICX-7850-10G(config-if-e25000-2/1/20)#dis

CORE-ICX-7850-10G(config-if-e25000-2/1/20)#sh optic 2/1/20

CORE-ICX-7850-10G(config-if-e25000-2/1/20)#
CORE-ICX-7850-10G(config-if-e25000-2/1/20)#

It shows nothing when port is down.

Hope this clarifies.

Thanks

Hashim

154 Messages

 • 

2.7K Points

Hi Hashim,

I can appreciate it is "as designed". What Im saying is that it's poorly designed. 

Also, in your case, you are shutting down the port which is not the same. In my case, the port is ADMIN UP (enabled) but operationally down due to a faulty fiber plant. Having DOM working when the port is operationally down (but admin up) can help troubleshooting greatly.

I will open an RFE 

best regards

Official Rep

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137 Messages

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4.2K Points

8 m ago

Also i asked you paste the output of your problem switch but i do not yet see it

show media x/y/z

show interface e x/y/z

show license

show version

Please share

Thanks

Hashim

14 Messages

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490 Points

8 m ago

Hello,

I have ICX-7150 with 08.0.95a.... can you please help me to configure the DHCP server on this switch?

Thanks.

Official Rep

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137 Messages

 • 

4.2K Points

Hi Claude,

Hope you are doing great.

From  the DHCP guide:

https://support.ruckuswireless.com/documents/3465-fastiron-08-0-95-ga-dhcp-configuration-guide

Configuring the DHCP server and creating an address pool

Perform the following steps to configure the DHCP server. Before you can configure the various DHCP server options, you must create an addresspool on your FastIron device.

1.Enter global configuration mode by issuing the configure terminal command.device# configure terminal

2.Enable the DHCP server.

device(config)# ip dhcp-server enable

3.Create a DHCP server address pool.

device(config)# ip dhcp-server pool cabo

4.Configure the DHCP server address pool.

device(config-dhcp-cabo)# network 172.16.1.0/24

device(config-dhcp-cabo)# domain-name ruckuswireless.com

device(config-dhcp-cabo)# dns-server 172.16.1.2 172.16.1.3

device(config-dhcp-cabo)# netbios-name-server 172.16.1.2

device(config-dhcp-cabo)# lease 0 0 5

5.To disable DHCP, enter the no ip ip dhcp-server enable command.

device(config)# no ip dhcp-server enable

6.Use the clear ip dhcp-server binding command to delete a specific lease or all lease entries from the lease binding database.

device(config)# clear ip dhcp-server binding

*The asterisk used in the example above clears all the IP addresses.

Hope this helps.

Thanks

Hashim

14 Messages

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490 Points

Hello Hashim,

I tried everything but still not working.

below are the configs did:

#sh conf
!
Startup-config data location is flash memory
!
Startup configuration:
!
ver 08.0.95aT213
!
stack unit 1
  module 1 icx7150-48p-poe-port-management-module
  module 2 icx7150-2-copper-port-2g-module
  module 3 icx7150-4-sfp-plus-port-40g-module
  stack-port 1/3/1
  stack-port 1/3/3
!

vlan 4 name DATA by port
 untagged ethe 1/1/1 to 1/1/30
 router-interface ve 4
 spanning-tree
!

ip dhcp-server enable
!
ip dhcp-server pool test
 lease 1 0 0
 network 172.16.1.0 255.255.255.0
 option  6 ip 172.16.1.2  172.16.1.3
 option  15 ascii ruckuswireless.com
 option  44 ip 172.16.1.2
!
!

!
interface ve 4
 ip address 172.16.1.1 255.255.255.0

Official Rep

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210 Messages

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3.1K Points

Hi Claude,

Pls start a new thread for the dhcp discussion since we are using this for DOM feature.

You may also open a support case for one of us to review and debug remote.

Thanks

Jijo 

154 Messages

 • 

2.7K Points

dear Jijo,

Regarding the DOM issue, can you see the added value in being able to monitor the DOM parameters while the link is down? in the field its extremely useful. I've relied on this feature (on other vendor's boxes) to, for example, instruct a remote tecnician to swap RX/TX pairs, or to check a single direction for a fiber cut. Also, in other cases it helped identified a not fully plugged in fiber as the received signal was there but was too low to enable link-up.

I am working with my regional customer engineer to see if we can open an RFE for this.

Thanks!

Official Rep

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210 Messages

 • 

3.1K Points

Dear Diego,

I understand the use case and it makes sense. We'll have to file an RFE to check the feasibility on the current architecture to take a final call. Pls let us know once the RFE# is filed.

Thanks

Jijo 

Official Rep

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137 Messages

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4.2K Points

8 m ago

Hi Diego,

Regarding this new feature you are requesting, you can task  your systems Engineer to open a request for enhancement.

This will then be submitted to u=our PLM who will discuss the feasibility of  supporting it, the Engineering team will then review the hardware and software to see if it is feasible based on the limits, if possible they will add this new feature  but like is said you have to have signals going thru to be able to see the output of show optics.

Hope this helps.

Thanks

Hashim

154 Messages

 • 

2.7K Points

Thanks hashim. Indeed, Im aready working the the local SE.

Cheers!

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