please explain me what is is-is in 3850 switch and how it is helpful to me if i am having 2 3850 switch

[mauleshg1]

please explain me what is is-is in 3850 switch and how it is helpful to me if i am having 2 3850 switch

[Peter Paluch]

Hello,

IS-IS is a link-state routing protocol that is similar in its fundamentals of operation to OSPF. Your 3850 supports IS-IS just like it supports OSPF, EIGRP, or RIP. Whether the IS-IS is helpful to you depends on your needs. You should first ask yourself: "Do I need a routing protocol between my two 3850s?" If you need a routing protocol then IS-IS can be considered as one of the prospective protocols to go with.

I had a webinar regarding the fundamentals of IS-IS here - perhaps it will be helpful. Look for the recording of the "The Return of IS-IS".

https://learningnetwork.cisco.com/community/learning_center/meet_authors

Best regards,
Peter

[Vasilii Mikhailovskii]

"IS-IS" is IGP; most typically seen in ISP networks.

If you are deploying IGP in Enterprise network, most typically you would be using OSPF, EIGRP or BGP.

PS:

http://www.cisco.com/c/en/us/td/docs/ios/12_2/ip/configuration/guide/1cfisis.html

http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_isis/configuration/12-4t/irs-12-4t-book.pdf