Routing MX 84 to Cisco 3750 Core

[TonyBoy]

What's the best practice for the MX IP and VLAN, Lets say that my Cisco Core VLAN 1 is set to 192.168.70.1

How should I set the MX

Name Default

Subnet: 192.168.70.0/24

MX IP: 192.168.70.254 (or Any Available IP)

VLAN ID 1  is ok to use same VLAN 1?

Cisco switch

interface GigabitEthernet1/0/36
 description Uplink to FW
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 1
 switchport trunk allowed vlan 1,2  (I have a second vlan for testing) 
 switchport mode trunk

[jcottage]

Hey TonyBoy,

With out knowing more about your topology I personally cant give you a 100% answer however I can tell you that as long and the MX and the 3750 have IP interfaces on the same vlan you will be able to route between them. 

Side Note: using vlan 1 is against best practice in Cisco world but not necessarily in the Meraki world

[PhilipDAth]

Does the 3750 have other layer 3 VLANs configured on it?

[TonyBoy]

Vlan 1  192.168.70.1 Default
Vlan 2 192.168.71.1 Wireless
Vlan 3 192.168.72.1 Cameras
Vlan 4 192.168.73.1 Voice
Vlan 5                       User
Vlan 6                       Production
Vlan 7                       Firewall  (ASA is living here)

Vlan 10                     Servers

Cisco Core is using   EIGRP

router eigrp 100
 network 192.168.76.0
 network 192.168.253.0
 network 192.168.254.0
 redistribute connected
 passive-interface Vlan254
 eigrp router-id 192.168.70.1
!
ip default-gateway 192.168.76.254

[MRCUR]

Is your MX meant to be your 3750's default gateway at 192.168.76.254 or is this another device? 

[TonyBoy]

will be the MX, the Core is already configured pointing at the FW

[jcottage]

Hey Tony,

Is the goal to replace the ASA?

[TonyBoy]

correct the MX will replace it and set it as the gateway