Cisco 3850

[HUGH LANCASTER]

Recently purchased 3850 12 port switch to replace a cisco 3750 12 port. This switch connects all the other buildings. Each building has a 3750 switch. I've configured the 3850 vlans, etc as the 3750 switch. Will there be a issue for the 3850 switch communicating with the 3750 switches? I have 3650 switches that will replace the 3750 switches in the other buildings. If possible, I would prefer to replace one switch at a time instead all at the same time. 

[Georg Pauwen]

Hello,

it depends what you have configured on the 3750. The 3850 runs IOS XE, so not all commands and features (especially the QoS stuff) can be translated one-to-one. 

Check Table 1 in the attached document:

https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-3850-series-switches/qa_c67-722110.html

[shaps · Accepted solution]

Hi
There will be no issues with putting in the switch above, as long as configs are the same as before. Any issues should be easy to overcome.

[HUGH LANCASTER]

Thanks for the replies!  I matched the config from the 3750 to the 3850. Comparing the show run on both they now look similar. If I get the 3850 installed and communicating with 3750, then I can replace one switch as time.

[Georg Pauwen]

Hello,

there are certain hardware incompatibilities as well, e.g. the uplink modules from the 3750-X are not compatible with the Cisco Catalyst 3850. Also the 3750 runs MLS QoS, while the 3850 runs MQC QoS, both of which are quite different.

[shaps]

Good point about the Qos, although I know cisco has a conversion chart some where with a like for like comparisons

[HUGH LANCASTER]

Since we have no IP phones, is there any commands in the default configuration to that I need to disable? Thanks