Currently trying to convert an EXOS configuration into VOSS with a topology I’m not sure how best to translate.
Here is a simple diagram of the topology. The two VOSS switches are a clustered pair.
Here their are two firewalls configured as active / passive, the active is top left, passive top right.
The links actually criss-cross but for simplicity I’ve drawn them as above. In essence there are four VLAN’s 3501 to 3504 that are each P2P /30 subnets and are configured as OSPF / BFD link adjacencies.
On the active firewall the ports are all up and active, the passive firewall the ports are all down.
The way it works and the way its configured in EXOS is that the same VLAN’s and P2P IP’s are configured on both cores, but because the side of the right is down, the VLAN interfaces are down, and therefor there is no conflict in the fact the same IP configuration is configured on both sides.
Should the active firewall fail, then the same P2P interfaces come up on the other core / firewall and everything is learned through their instead. This is configured that way as the firewalls have identical configuration, so when flipping across the configuration is still the same, hence the link configuration needs to be the same.
Not sure how to mirror this in VOSS i.e. have the same IP both sides. This is required additionally if one VOSS core fails the other VOSS core needs to own the IP addresses, much like the EXOS config would have.
Maybe I can use RSMLT or DVR in this capacity to create a common IP between the clustered VOSS switches?
Maybe I could do something with Flex-UNI to put the same VLANs each side into different I-SID’s. That would essentially be the same VLAN ID on port, but each port will have a different I-SID, meaning I could possibly use the same IP (P2P Subnet)?
The only other option I can think of is having one side own two of the VLAN’s IP addresses (P2P Subnets), and have the other side own the other two. I could then just use the fabric to get each of the VLANs to the correct place. Issue with that is if one of the cores fail, I effectively only have two OSPF adjacencies instead of four?
Many thanks in advance.