[FROG] OSPF: scaling routers in area or areas per se
m.muenz at spam-fetish.org
Tue Sep 21 12:18:58 UTC 2021
I'm currently designing a new network, it has 2 DC's with each having a
Each VPN cluster has a Firewall Cluster behind and it's set up in a
circle, so VPN in DC1 has a DCI to VPN in DC2 and a dedicated link to FW
Same as in DC2 and FW in DC2 has a DCI to FW in DC1. In this circle I'm
running area 0.0.0.0 and wherever I add a new interface it's known to
Now comes the fun part. We have 100 branches and we use OpenVPN to
connect to one of the VPN concentrators with the second as backup.
The challenge is, that it shouldn't matter where the branch currently is
connected to, BUT, it's only allowed to be connected to one DC to
prevent async routing.
Technically this is also easy, but I'm not sure which one scales better:
- Have only one area 0.0.0.0 also on the branches, so over 100 routers
in one area
- Have for each branch one area, so over 100 areas having only one router
- Running external via BGP and having 100 neighbors with 100 private AS
Anyone here experienced regarding scaling this size?
More information about the frog