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Apologies in advance if this is super-basic question, still learning ISIS.

I'm migrating from Cisco over to Juniper in an environment where all of the switches are running EIGRP, are on a 172.31.255.0/24 segment which is an SVI (VLAN 9) and they reach each other via trunk links. I will be adding Juniper switches into this environment, configuring them to run IS-IS.

My question is, if I plan to keep the same SVI subnet on my Juniper switches and run IS-IS, would I configure a point-to-point statement under the SVI interface or would I make it broadcast since technically it's just one giant VLAN?

My long term plan is to eventually cut down on all the VLAN sprawl and go EVPN/VXLAN but I would like IS-IS as my IGP. Thanks.

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  • Has any answer solved your question? Then please accept it or your question will keep popping up here forever. Please also consider voting for useful answers.
    – Zac67
    Apr 25, 2023 at 8:05

1 Answer 1

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Whether you use broadcast or explicit P2P doesn't really matter for a small number of routers/L3 switches. With larger numbers, P2P creates more overhead and becomes harder to maintain .

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  • Awesome, thank you.
    – user68992
    Mar 26, 2023 at 15:43

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