SRX

Hi there, 

I was trying to connect the SFP port on an SRX300 to the SFP port on an EX3300 as I would like to use this as the uplink between the 2 devices. 

However, I noticed even after connecting a DAC cable, the link between the 2 devices is not established (no link LED flashing). 

Would anyone know why this wouldnt work? I understand the EX3300 works with 10GB SFP ports and the SRX300 support only 1GB however, I'd imagine they would auto negotiate on the speed. 

Thank you,

Hi Vishal, 

I dont think the 10G DAC cables are supported on SRX300 series, 

Please check here for the compatible transceivers 

https://pathfinder.juniper.net/hct/category/#catKey=100001&modelType=All&pf=SRX+Series 

You cannot connect xe to ge optics and negociate down.

You can use a ge optic in some sfp+ ports if they support going either speed.  But the optics on both sides need to be the same.

So in your case you need to confirm if the sfp port on the ex3300 can accept an ge optic.  According to the data sheet it does, so this is good.

And then use a ge DAC cable instead of an xe one.

Thank you,

The SRX300 has the ge optics set, however the EX3300 switch has xe optics set. Therefore would you recommend that I change the xe to ge on the EX3300 switch? How do I do this ?

Thanks,

Vishal

The uplink ports support both sfp and sfp+ on the ex3300.  You will simply insert the sfp ge optic or DAC into the port you want to use.

You can confirm the optic is recognized using

show chassis pic fpc-slot 0 pic-slot 1

then you configure the port deleting any previous xe configuration and use the ge syntax

examples for 

port 0: interfaces ge-0/1/0 and  xe-0/1/0

port 1: interfaces ge-0/1/1 and  xe-0/1/1

https://www.juniper.net/documentation/en_US/release-independent/junos/topics/concept/ex3300-hardware-overview.html

Thank you,

That's really helpful. I deleted the xe configuration :

[edit interfaces interface-range FW-Uplink]
member xe-1/2/1 { ... }
+ member ge-0/2/0;
- member xe-0/2/0;
[edit interfaces]
- xe-0/2/0 {
- ether-options {
- auto-negotiation;
- }
- unit 0 {
- family ethernet-switching;
- }
- }
[edit protocols rstp]
- interface xe-0/2/0;

and added the ge-0/2/0 interface to the FW Uplink range (it's in a cluster so I have to use 0/2/0).

However it still didnt work, i think it is the cable which is what you said earlier. The one I have is a 10GB. I will buy a ge 1GB cable and give that a go.

Many thanks,

Vishal

After you insert the optic or the DAC run this command

show chassis pic fpc-slot 0 pic-slot 1

This will let you know what Junos sees as the optic in that slot.

If it is not able to see the optic at all it is not compatible.