switch old cisco L3 switch with a meraki MS-250 L3

[JJ972]

I have removed the old cisco L3 core switch to my network and replace it with a L3 Meraki MS250 Poe switch.

I have noticed I cannot ping the internet anymore and cannot ping other company devices in the Enterprise Cloud.

Any idea?

[GreenMan]

Quite a bit more info would be needed to help with this.   Did you create routing interfaces on the L£ stack into each of the VLANs, under Switching > Configure > Routing & DHCP?

Given that Support are likley to have visibility of your Dashboard (for all this kind of stuff) - you might be better raising a case with them.

It seems you may have two possible paths to the Internet - one via the MX100, one via Velocloud device.   How do you plan to use that?   Dynamic resilience might be a particular challenge, I think...

[JJ972]

Hi GreenMan,

Yes  routing interface has been set 

for the two paths question, it is working like that on the old cisco L3.

[GreenMan]

OK - assuming Meraki MS switches work the same as old Cisco L3 might be an issue.  What mechanism(s) were they using to handle the two available paths?

[PhilipDAth]

Have you copied across any static routes to the Merki L3 stack?

Was the old Cisco core switch running any dynamic routing protocols?

Going sideways - do you have any high bandwidth servers internally or is everything you access external?  If most things are external, you could move all layer 3 processing to the MX100 to try and simplify things.

[JJ972]

we have copied all the route fromthe cisco L3 to the meraki L3

no dynamic routing protocols

All the DHCP server and applications servers are on  others subnets.

we also have added the route to these network

the default route is going through the mx firewall

DHCP servers and ERP applications traffic is going through the VeloCloud appliance 

I have just noticed I have RSTP enable. Does it could be the culprit?

I don't have it enable on another similar configuration

[alemabrahao]

This seems to be a problem with the STP priority, from what I saw you are using the default priority (I believe the other switches are like this too). Have you tried changing the priority of your Switch L3 to a higher priority (priority 1 for example)?