i have the following problem:
we are changing from 3506X to Switch WS-C3850-48P.
The network module for WS-C3850-48P is: C3850-NM-4-10G.
the 3560x switch is using SFP GLC-SX-MM=.
We have replaced the 3560X switch by 3850 and we have used the SFP module.
The 3850 recognize the SFP module but the fibe optic link is down: physical and logical is down.
At Cisco Gigabit Ethernet Transceiver Modules Compatibility Matrix document does not appear the model: WS-C3850-48P so we understand that SFP Module GLC-SX-MM is not supported by Cicso WS-C3850-48P and C3850-NM-4-10G.
would you be mind telling me if we can use SFP GLC-SX-MM= with WS-C3850-48P and C3850-NM-4-10g, please?
Solved! Go to Solution.
The SFP should be compatible, see link below:
Also for the C3850-NM-4-10G module - All ports default to 10G and should be configured as
TenGig1/1/1 through TenGig1/1/4 - even though you are operating them as 1G via SFPs.
Yes it is a cisco SFP I am using.
when I insert the SFP at network module nothing appears at log file BUT at tengigaethernet interface appears the model of the SFP I have inserted:
media type 1000BASESX SFP
tengigaethernet 2/1/1 is down line protocol is down (not connected)
the configuration is:
I use the sfp to connect a remote router using the same SFP.
But when I use the same SFP at 3560X with C3KX-NM-1G the pshysical and logical link is UP..
You may have hit this bug, try without the "speed nonegotiate"
The ports using with C3850-NM-4-10G / GLC-SX-MM is not link-up after switch reload.
This issue is only seen "speed nonegotiate" setting.
3850 running with 3.6.0E /3.6.1E /3.7.0E.
Delete "speed nonegotiate" and input same configuration again.
Further Problem Description:
before and after the put in service of cisco 3850 switches in stack modality I tested many option:
and with each of them the physical and logical link stay in DOWN.
the version running at 3850 switches are: 3.2.3 SE.
can you tell me if we change the actual version to 3.3.5 SE the problem will be resolved?
In the link that you send to me: matrix between 3850 and SFP modules, does not appears the model: WS-C3850-48P-S so we can tell that this model does not support SFP GLC-SX-MM?
Thanking you in advance and waiting your sooner answer.
From the compatibilty link the C3850-NM-4-10G supports the GLC-SX-MM and as your switch supports this module, it should work. As the link is down/down I'd check the basics again and try another SFP if you have a spare. Looking at the documentation is doesnt appear to be clear but I think you may have to upgrade to XOS 3.7.2E as the compatibity list would seem to indicate 3.7.1 as the minimum for an all 10Gb module, but you'll need to check the release notes to check that the upgrade is suitable for you.
I have do many tests with others SFP GLC-SX-MM in production and the result is the same: the C3850-NM-4-10G recognize this module but the layer1 and layer 2 is down/down.
We have a WS-C3850-48P and as you can see this model is not listed in the next chart:
We can change the IOS but the the model WS-C3850-48P does not appear in the chart above.
can we set with all these tests and information, that the model WS-C3850-48P does not support SFP GLC-SX-MM?
thanking you in advance.