User guide

Configuring IS-IS IS-IS Overview
OmniSwitch AOS Release 7 Advanced Routing Configuration Guide March 2015 page 3-13
If the restarting router, Router X, is identified as the Designated Router (DIS) on the network segment S at
the beginning of the helping relationship, the helper neighbor, Router Y, will maintain Router X as the
DIS until the helping relationship is terminated. If there are multiple adjacencies with the restarting Router
X, Router Y will act as a helper on all other adjacencies.