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Ask the Expert- SD-WAN

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Beginner

Re: can the SFP-10G-SR down-support connect to SFP 1000BASE-SX ?

Actually there is; but apparently not for optical *ethernet*.  Optical fiber channel can allegedly negotiate 2 speeds down.  Not that I've tried it.  But, then again, those are different transceiver modules.

Beginner

Re: can the SFP-10G-SR down-support connect to SFP 1000BASE-SX ?

Not entirely true.  On Nexus I'm using the 10G twinax running at 1G.  I used the "service unsupported-transceiver" command on the interface and it came right up.  So far no issues.  I know this isnt fiber so it may not apply.  

Beginner

Re: can the SFP-10G-SR down-support connect to SFP 1000BASE-SX ?

As far as I know these can only do 10 gbps ( and can't fall back to 1 gbps )

Kind regards.

Beginner

Re: can the SFP-10G-SR down-support connect to SFP 1000BASE-SX ?

If this is a Nexus switch; and one is only going to run 1gb on this
port; why wouldn't one put a 1g SFP in that particular port and save the
10g ones for ports that actually are going to be connected at 10g? The
switch itself should be able to handle both SFP's. And the connection
is point-to-point.

We have both nexus 9k's and nexus 5k's; and the 9k's auto sense the SFP
(and thus the speed) in a particular port. The 5k's seem a bit more
primitive; you have to tell it the port speed it should use.

Beginner

Re: can the SFP-10G-SR down-support connect to SFP 1000BASE-SX ?

In my case this was a quick fix because no RJ45 1G SFP's were on hand but there were excess twinax cables available.  We are ordering those now.  Other than support issues, if they work I dont see why we shouldnt use them.

Beginner

Re: can the SFP-10G-SR down-support connect to SFP 1000BASE-SX ?

That would make sense if you can obtain twinax cables of reasonable
length. I just figured if you had one 1g SFP, you probably had more.

On another note; which many folks may not know; Prolabs makes a "Cisco
compatible" 10g RJ45 copper SFP that works well in Nexus switches. I
have several in use in my lab. They also tend to work well in various
(originally fiber) ethernet cards that have removable SFP ports. As far
as I know, no one else makes 10g RJ45 SFP's. Took me a while to find
them. Not sure why more vendors - including Cisco itself - doesn't make
them; since I'm sure that many places have legacy copper (RJ45) patch
panels and trunk runs; and if they're cat6 they're probably just as
reliable (and simpler to use since you don't have to run any extra long
cables) than twinax.
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