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What’s the difference among IS, ES and DIS?

Latest reply: Apr 6, 2016 08:01:51 1356 1 0 0 0

What’s the difference among IS, ES and DIS?

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Created Apr 6, 2016 08:01:51

IS (Intermediate System): Network nodes with packet forwarding capability, similar to the IP router.
ES (End System): Network nodes without routing capability or data packet forwarding capability, similar to the IP host.
DIS (Designated Intermediate System): In ISIS broadcast network type, it need to elect a designated intermediate system, flooding LSDB to other routers periodically. The function is similar to the DR (Designated Router) in OSPF. There is a concept of backup BDR(Backup Designated Router) In OSPF, which doesn't exist in ISIS
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