We are exploring the firewall deployment options for one of our customers who have a requirement to stretch few VLANs across 2 data centers most probably using VXLAN/EVPN. The options currently being explored are:
1. Active-Standby firewalls in each data center
2. Active-Active firewall with one node in each data center
Are there any design/deployment references for these scenarios especially how to avoid double firewalling and the possible scenarios for asymmetric routing and how to avoid them.
you can avoid asymmetric routing by not deploying in Active/Active
do both datacenters need to be 'hot' or is there one warm standby? do both need active connections to the outside and will the bandwidth needed exceed the VXLAN/EVPN capability?
I'd try to void A/A as that complicates your configuration tremendously with very little ROI (you'll also need to enable HA3 and make sure jumbo frames are supported over the VXLAN/EVPN etc)
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