isis suppress-flapping peer hold-down

Usage Scenario

Flapping suppression works in either Hold-down or Hold-max-cost mode.

• Hold-down mode: In the case of frequent flooding and topology changes during neighbor relationship establishment, interfaces prevent neighbor relationship reestablishment during Hold-down suppression, which minimizes LSDB synchronization attempts and packet exchanges.
• Hold-max-cost mode: If the traffic forwarding path changes frequently, interfaces use the maximum value (16777214 for the wide mode and 63 for the narrow mode) as the cost of the flapping link during Hold-max-cost suppression, which prevents traffic from passing through the flapping link.

Flapping suppression can also work first in Hold-down mode and then in Hold-max-cost mode.

By default, the Hold-max-cost mode takes effect. To configure the Hold-down mode and set duration for this mode, run the isis suppress-flapping peer hold-down interval command.

Prerequisites

IS-IS neighbor relationship flapping suppression must have been enabled globally before you configure the Hold-down mode and set duration for this mode. By default, the function is enabled. If it is disabled, run the undo suppress-flapping peer disable command to enable it before you configure the Hold-down mode and set duration for this mode.