Need help with bringing up a new switch

[Damon2021]

Hi,

I am bringing up a new L3 switch and I am missing something as the L3 vlan is not ping-able from internal network.

See diagram.

The core is existing and in production. I added a new L3 switch and would like to be able to ping 10.10.10.1 from internal network. I would like the ping to traverse the p2p link between switch and core (gi1/1). Please advice.

Thanks

[Damon2021]

I only see the local subnets

[MHM Cisco World]

that way you ping to internal failed, 
you run OSPF but the OSPF is run only between Core and New L3 SW and 
OSPF in Core do not advertise any prefix this why.

[Damon2021]

My only concern is adding the

originate

command won't affect the existing networks.

[MHM Cisco World]

Yes sure effect if the OSPF run in all network then you will have tow default network and if the AD is lower for OSPF then all traffic will forward to Core SW, 

so 
there is workaround which is config default route in new L3 SW toward the Core 
this default route will not advertise via OSPF 
this make Core can connect to New L3 SW and vice versa, and this will not effect your network.

[Damon2021]

so do something like:

ip route 0.0.0.0 0.0.0.0 10.10.30.2

[MHM Cisco World]

Yes this default route effect only new L3 SW not all your network. 

[emurray]

I think you can specify area 0 both ways. 0.0.0.0 equals area 0.

[MHM Cisco World]

I will check this point thanks.

[emurray]

There info here

https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13703-8.html

[emurray]

Did you add the VLANs to the VLAN database?

[Damon2021]

Yes, It is working now. The

default-information originate 

was the best solution and the workaround of adding a default route pointing to the p2p link was a great alternative. Thanks all for the help.