03-29-2018 07:28 AM - edited 03-05-2019 10:11 AM
Hi,
i'm facing issues for the ISR4331 which the speed and duplex needed to hardcore to 100mbps and duplex full. It is running isr4300-universalk9.03.16.04b.S.155-3.S4b-ext.SPA.bin version. It is connected to switches WS-C3850 version cat3k_caa-universalk9 03.07.04E.
Are the model WS-C3750G also need manual configure speed and duplex with ISR4331? I find this amusing ot it is software bug for ISR4331 router.
03-29-2018 08:52 AM
Hello,
what happens if you leave the 4331 interface on 'auto negotiate' ? Does it negotiate half duplex ?
03-29-2018 10:34 AM
03-29-2018 12:00 PM
Try and set the media type on the interface, and check if that changes the behavior:
media-type rj45
or
media-type sfp
depending on which interface you are connecting the 3850 to.
03-29-2018 07:47 PM
03-30-2018 01:21 AM
Hello,
check if you are hitting the bug below. Either way, does it work when you manually set the media type ?
EHWIC-1GE-SFP auto media type is not working properly
CSCuy43787
Description
Symptom:
A EHWIC-1GE-SFP containing a 1000baseT SFP may result in the link staying down/down and the configured speed/duplex being automatically changed.
Conditions:
The EHWIC-1GE-SFP must not have a media type manually configured and the card must have a 1000baseT SFP installed along with a working ethernet connection on the builtin RJ45 port. The interface must be manually configured for 100/Full duplex. When the problem occurs (normally after a reboot) the running configuration will automatically change to 1000/Full and the link will stay down/down.
Workaround:
Manually set the preferred media type using the command "media-type sfp" or "media-type RJ45".
03-30-2018 05:22 PM
Keep an eye out with the SFP module and the IOS. There are several GLC-T and SFP-GE-T bugs affecting 16.X.X and it's just identifying which one to avoid.
A good example is CSCvd90801.
When in doubt, raise a TAC Case and get TAC to officially confirm which version to use/avoid.
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