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Intermediate System Hello (ISH) packets
are a type of a hello packet. ISH is part of the ES-IS spec 9542; similar to
IRDP in TCP/IP; used for ISs and ESs to detect each other. ISH packets are sent
out to all IS-IS-enabled interfaces. On LANs they are sent out periodically,
destined to a special multicast address. Routers will become neighbors when
they see themselves in their neighbor's hello packets and link
authentication information matches.
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