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Re: L3 routing setup

by in Switching
‎Jun 25 2021 8:20 AM
‎Jun 25 2021 8:20 AM
Ugh, yeah, my bad.  I meant 10.10.20.1.  Yes, that is currently in use at my core. Thanks.   Okay, so that confirms my understanding. I see where it says that now in the documentation.  Guess I glazed over that.     Next question is a chicken/egg situation.   If I configure the interfaces on the Meraki stack while online, there will be IP conflicts with the existing Cisco stack.  I can configure them offline, but then if I take the Cisco stack out and replace it with the Meraki, it will not be able to get to the cloud to update the config since the Cisco is the gateway.   I suppose at cutover time I bring the Meraki online, let them update the config and have conflicts, then take the Cisco stack down and make the change over. Right? ... View more

L3 routing setup

by in Switching
‎Jun 25 2021 7:39 AM
‎Jun 25 2021 7:39 AM
I've tried to figure out the L3 routing config on my own, but it's just not clicking in my head.  Most of the help leads to the same Meraki documentation page (https://documentation.meraki.com/MS/Layer_3_Switching/MS_Layer_3_Switching_and_Routing) and I guess I need it spelled out a little more, or explained differently.    Situation, I'm replacing 3 stacked Catalyst 3750s as my core with stacked MS390s.  I have the 390s stacked, firmware updated and online.  I'll be changing them out next week on our shutdown week. I'm pre-configuring as much as I can, without creating IP conflicts.   My existing catalyst has a default gateway of 10.10.23.254 (IPs changed to protect the innocent) and a route of 0.0.0.0 0.0.0.0 10.10.23.254 configured.  In addition, vlan interfaces are configured (vlan20 - management vlan 10.10.20.1, vlan 60 - voice 10.10.60.1, etc) with helper-address 10.10.20.50 for DHCP requests.   When I look at creating the first L3 interface on my 390 stack, I get confused. I've got Name- "Uplink" Subnet - "10.10.20.0/22" Interface IP - <This is my question> 10.40.20.1? Default Gateway - 10.10.23.254  Multicast -  Disabled VLAN - 20?   Then, I create my other interfaces. Name - Voice Subnet - 10.10.60.0/22 Interface IP - 10.10.60.1 VLAN - 60 Multicast - Disabled Client addressing - Relay to another Server DHCP Server IPs - 10.10.20.50 etc.   I may have answered my own question typing this out. lol Creating the initial default gateway also creates the interface for my vlan 20 (with IP 1010.20.1), correct? Then I don't need to create vlan20 in later steps.  ... View more
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