Just creating a configuration and wondered what would be deemed the proper way to do it.
I'm currently joining a legacy network with a new Extreme network, and would like to do it over layer 3 using ospf.
The legacy core network is a stack, and the new Extreme are two separate cores joined via MLAG, and I am also utilising fabric routing on all my VLANs
The link between the legacy and new Extreme is via a LAG, so I'm essentially running a single router on the legacy network via a single layer 2 logical link that is split between two different routers core 1 and core 2 on the Extreme side that is running MLAG.
I also have a /30 subnet configured between Extreme Core 1 and Core 2 to share dynamic route information, and is configured as a point-to-point. All other VLANs have been configured as passive.
So I'm thinking I have two ways of doing this:
Create VLAN-A /30 on Extreme Core1
Create VLAN-B /30 on Extreme Core2
Create VLAN-A /30 on Legacy Core
Create VLAN-B /30 on Legacy Core
Add both VLANs tagged to LAG between Legacy and Extreme
Configure both VLANs as point-to-point in OSPF
Create VLAN-A /29 on Extreme Core1
Create VLAN-A /29 on Extreme Core2
Create VLAN-A /29 on Legacy Core
Add VLAN to LAG between Legacy and Extreme
Configure OSPF as broadcast for VLAN
My thoughts are to go with the second option, predominantly because I'm then adding the same VLAN information to each leg of the LAG / MLAG config on both cores, which seems to me the proper way to do it... not sure if 1st option would even work.
Maybe there is a different way to do?
Many thanks in advance