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Configuring IS-IS IS-IS Overview
OmniSwitch 6800/6850/9000 Advanced Routing Configuration Guide December 2007 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.