When IS-IS is electing a DIS, what is used as the tie breaker on an Alcatel-Lucent 7750 SR, if the priorities are the same?
When IS-IS is electing a DIS, what is used as the tie breaker on an Alcatel-Lucent 7750 SR, if the priorities are the same?
In IS-IS, when electing a Designated Intermediate System (DIS) on an Alcatel-Lucent 7750 SR, if the priorities are the same, the highest interface MAC address is used as the tie breaker. This is a standard procedure in many network devices to ensure a consistent and preemptive method of DIS election.
Routers exchange Hello PDUs to form an adjacency and to elect the DIS on a broadcast network. The DIS election is preemptive and is the router with the high-est priority, or the highest interface MAC address as a tiebreaker