[c-nsp] SFP-10G-LRM in Nexus 5000

[Mike Hale]

"No."

I stand corrected.  ;)

"What's on the opposite side of the 5548s?"

They are up and running right now on a 3750X and a 2960S.  I have a
vague memory of having them in some servers in the past as well, but
I'm not seeing any of those right at this moment.

On Tue, Sep 15, 2015 at 9:47 AM, Crist J. Clark
<cjc+cisco-nsp at pumpky.net> wrote:
> On Mon, Sep 14, 2015 at 03:21:27PM -0700, Mike Hale wrote:
>> Correct me if I'm wrong, but the LRM SFPs are designed to go over MMF,
>> not SMF.  Isn't that going to be a problem?
>
> No. As someone else already pointed out, Cisco says you can run LRM over
> SMF for 300m, which is actually longer than they say you can run it over
> MMF, 220m. You also don't need mode conditioning over SMF.
>
>> We're using some LRM SFPs between floors to a 5548, and they function
>> just fine.
>
> What's on the opposite side of the 5548s? It may be similar to what we're
> seeing. It looks like this works fine Nexus to Nexus, but it is flaky
> Nexus to Catalyst.
>
>> On Mon, Sep 14, 2015 at 3:15 PM, Crist J. Clark
>> <cjc+cisco-nsp at pumpky.net> wrote:
>> > On Mon, Sep 14, 2015 at 10:45:58PM +0100, Nick Hilliard wrote:
>> >> On 14/09/2015 22:39, Crist J. Clark wrote:
>> >> > We are running all of this over SMF.
>> >>
>> >> why are you using LRM transceivers then?
>> >
>> > I am not exactly sure of the design decisions behind the choice to use LRM over
>> > SMF to orginally connect the distro to the core when the campus was built. But
>> > given that it was working, and we already had almost enough spare LRMs on hand
>> > to complete the project, It Seemed Like a Good Idea at the Time.
>> >
>> > We also have OM3 MMF between the buildings so replacing this all with SR is
>> > the main plan right now, but whatever the problem is with the LRM modules
>> > looks more like software/firmware than a problem with the fiber paths (the links
>> > always do eventually come up with good light readings and no errors), and we
>> > were just curious if anyone had seen this issue with 5ks and LRM before and
>> > found a way to deal with it.
>> > --
>> > Crist J. Clark
>> > _______________________________________________
>> > cisco-nsp mailing list  cisco-nsp at puck.nether.net
>> > https://puck.nether.net/mailman/listinfo/cisco-nsp
>> > archive at http://puck.nether.net/pipermail/cisco-nsp/
>>
>>
>>
>> --
>> 09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0
>
> --
> Crist J. Clark



-- 
09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0