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Interface shows link alarms although reciever power is in acceptable limits

2 weeks ago

I have below connections.

 

MX104(Router1 ) > IBM IPS > SRX1500.

MX104(Router2) > IBM IPS > SRX1500 

 

The connection between IBM IPS to SRX is up. (Laser receiver power : 0.0586 mW / -12.32 dBm), but between the MX104 and IPS does not come up. I have 2 different MXs with the same issue. When I bypass the IBM IPS, the ports come up.

 

Right now the diagnostics optics shows below output.

Router 1 - MX104

Laser bias current : 5.726 mA
Laser output power : 0.3140 mW / -5.03 dBm
Module temperature : 31 degrees C / 88 degrees F
Module voltage : 3.2930 V
Receiver signal average optical power : 0.7063 mW / -1.51 dBm

 

Router 2 - MX104

Laser bias current : 5.908 mA
Laser output power : 0.3110 mW / -5.07 dBm
Module temperature : 32 degrees C / 89 degrees F
Module voltage : 3.3020 V
Receiver signal average optical power : 0.5728 mW / -2.42 dBm

5 REPLIES 5
Routing

Re: Interface shows link alarms although reciever power is in acceptable limits

2 weeks ago

Hi,

 

What typr of interfaces (1G or 10G) are you using? What type of optics are you using?

Try to tweak speed/duplex/auto-negotiation parameter and see if you can bring up the link 


Mengzhe Hu
JNCIE x 3 (SP DC ENT)
Routing

Betreff: Interface shows link alarms although reciever power is in acceptable limits

2 weeks ago

Hello,

 

for 1G interfaces, the autonegotiation protocol of Juniper devices is not always compatible to other vendors. In your case, please configure the following commands on your Juniper device:

 

set interfaces <IF name> ether-options no-auto-negotiation

set interfaces <IF name> speed 1g

set interfaces <IF name> link-mode full-duplex

 

Ideally the same settings should be configured on the IBM IPS device to have the same settings on both sides.

This is only applicable for 1G interface, for 10G interfaces, this is not possible.

 

Please check if this works.

 

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Routing

Re: Interface shows link alarms although reciever power is in acceptable limits

2 weeks ago

The port is a 1G.

SFP-SX

Part - 740-031851

 

 

Routing

Re: Interface shows link alarms although reciever power is in acceptable limits

2 weeks ago

I tried all of the above things. none worked.

Routing

Re: Interface shows link alarms although reciever power is in acceptable limits

2 weeks ago

Have you verified that both sides (MX104 and IBM IPS) receives almost the same Rx power? It is possible that even MX104 receives light, IBM IPS does not because of a faulty SFP or a cable break.

 

Can you copy the interface configs and the Rx/Tx light levels of both sides to this thread?

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