I’ve inherited a network for a large enterprise. The company has roughly 50 sites and that could grow to ~200 within a few years. They are small sites with just a few network devices in each location.
For WAN connectivity they have a layer2 service from two telcos. Basically a VPLS style setup where we use a VLAN on our external port and we get connectivity into all other sites.
ISIS is used as the IGP. Right now we enable ISIS on the multiaccess provider interface so everything on that VLAN forms adjacencies with everything else. Right now that means about 50 devices are all in the same VLAN all running ISIS in a single level 2 area.
There is also some point to point wavelengths between the bigger sites that also do ISIS in the same area. BGP is used as well, we peer with loopbacks at each site, and have route reflectors doing the bulk of the work. ISIS is used only for advertising the loopbacks of each device
So my question is, how many devices do you think can exist in the multiaccess network before ISIS starts to have issues?
All the devices that participate in ISIS are modern, QFK10K, QFK5K, NCS5500..
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