This object sets the delay metric value to announce this Level 2 summary address with, where zero is reserved to indicate the metric isn't supported. Administrators use this optional metric type when path latency, rather than just hop-count-style default metric, should factor into route selection for this summarized destination. For example, an engineer configures a nonzero csIsisL2SummAddrDelayMetric for a summary address reached via a satellite backup link, signaling its higher latency to routers capable of using delay-sensitive path selection.