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VLAN and routing assistance needed

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Last Modified: 2017-11-16
We have a shared DR site with our parent company and we are currently on the same subnet (192.168.200.0/24).  Both of our production sites are in separate physical locations with a point to multi-point metro-ethernet link between the sites.  I'd like to segragate our servers from the parent company and place them on a separate subnet at the DR site.  

I'm including the config below that is relevant to my situation.  My production site is "Switch 1", the DR site is "Switch 2" and the firewall is at the DR site.  

At the DR site, I can either use the switch for layer 3 by configuring an IP (192.168.206.1) on interface vlan 206, or the firewall using 192.168.206.254.  My thought is that it would be more secure using the firewall, I'm not really seeing additional latency.  If I use the switch, I would need vlan 206 to use a different default route than vlan 200, which I don't think is possible.  Our parent company will remain on the 200 VLAN using 192.168.200.0/24.  My question is, I have it working using the firewall for routing as the default gateway of my servers on vlan 206, but am I configuring this in the most ideal way?  Thanks.

Switch 1 (Production site)

interface Vlan210
  ip address 192.168.210.2 255.255.255.0
 
ip route 192.168.206.0/24 192.168.210.1


Switch 2 (DR site)

interface Vlan210
 ip address 192.168.210.1 255.255.255.0

interface Vlan206
 ip address 192.168.206.1 255.255.255.0

interface Vlan200
 ip address 192.168.200.1 255.255.255.0

ip route 0.0.0.0 0.0.0.0 192.168.200.3
ip route 192.168.17.0 255.255.255.0 192.168.210.2

Firewall (DR site)

interface Ethernet0/0
 nameif Outside
 security-level 0
 ip address 98.x.x.x 255.255.255.240

interface Ethernet0/1
 nameif Inside
 security-level 100
 ip address 192.168.200.3 255.255.255.0

interface Ethernet0/2
 no nameif
 no security-level
 no ip address

interface Ethernet0/2.100
 vlan 205
 nameif companyA_dmz
 security-level 50
 ip address 192.168.205.1 255.255.255.0

interface Ethernet0/2.200
 vlan 206
 nameif companyA_inside
 security-level 0
 ip address 192.168.206.254 255.255.255.0

interface Ethernet0/2.300
 vlan 210
 nameif switch_network
 security-level 0
 ip address 192.168.210.3 255.255.255.0

object network CompanyA_Inside
 subnet 0.0.0.0 0.0.0.0

object network CompanyA_Inside
 nat (companyA_inside,Outside) dynamic interface

route Outside 0.0.0.0 0.0.0.0 98.x.x.x 1
route switch_network 192.168.17.0 255.255.255.0 192.168.210.1
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