On an IS-IS network, two directly connected routers establish a neighbor relationship through the three-way handshake mechanism by default, regardless of whether the network type is P2P or broadcast.
Comprehensive and Detailed Step-by-Step Explanation:
IS-IS Three-Way Handshake:
IS-IS uses a three-way handshake to establish neighbor relationships.
This process is applied on both point-to-point (P2P) and broadcast network types to confirm bidirectional communication.
P2P Networks:
Routers directly exchange IS-IS Hello (IIH) packets to establish adjacency.
Broadcast Networks:
IS-IS also uses the three-way handshake on broadcast networks to ensure that the Designated Intermediate System (DIS) election and adjacency formation are correct.
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