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In ISIS Protocol, how to elect the DIS?

Latest reply: Mar 28, 2016 07:48:44 1836 1 0 0 0

In ISIS Protocol, how to elect the DIS?

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Created Mar 28, 2016 07:48:44

In ISIS, the DIS election is carried out automatically. It is based on the interface priority of the same network. If there are more than one interfaces with the highest priority, then the maximum MAC address from those interfaces with same priority will be elected . DIS is elected in the IS based on the neighbor information of the  interface. Neighbor information is consistent throughout the network, so the the respective election results are the same.
Only broadcast network type will elect DIS. It's no need to elect DIS in the Point-to-Point network type.
Different levels have different levels of DIS.
Backup DIS doesn’t exist in ISIS. When the DIS does not work, another DIS will be elected directly.
Interval of Hello packets sent by the DIS is 1/3 the interval of the ordinary router, so it's easy for the other router to rapidly detect DIS failure and quickly elect a new DIS.
DIS router is not permanent, once the priority of a new router in the network is higher than the priority of the current DIS, or the current DIS does not work, the network will re-elect the new DIS. So the stability of the network is poor .
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