Configuration Guide

Table Of Contents
16.3SMLT BEB – ISIS Hello Timer Guidelines for ERS
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October 2021
80
8800
Connection Type 11-hello-interval l1-hello-multiplier
IST – NNI ISIS
1 sec 27
NNI ISIS
9 sec (default) 3 (default)
Please note that this recommended ISIS hello timer guideline only applies to the ERS 8800
On the IST, ISIS is enabled on the MLT bundle
Upon node restart, we need the ISIS adjacency over the IST MLT to come up before the IST
comes up, therefore the ISIS Hello timer is reduced to 1 sec
The hello multiplier is increased by the same factor to ensure the same time delay for an ISIS
adjacency to transition in the down state
1x27 = 9x3 = 27