set-overload-bit

Configures a device to signal other devices not to use it as an intermediate hop in their shortest path first (SPF) calculations if the resources of the intermediate system are overloaded and preventing the IS from properly performing Intermediate System-to-Intermediate System (IS-IS) routing.

Syntax

set-overload-bit

set-overload-bit on-startup value

set-overload-bit on-startup wait-for-bgp [ max-bgp-wait-time ]

no set-overload-bit

no set-overload-bit on-startup interval

no set-overload-bit on-startup wait-for-bgp [ max-bgp-wait-time ]

Command Default

A device automatically sets the overload on in its Link State PDUs (LSPs) to other intermediate systems if an overload condition occurs.

Parameters

on-startup: Sets the overload bit when the system starts up. The overload bit remains set for the number of seconds configured or until Border Gateway Protocol (BGP) has converged, depending on the subsequent argument or keyword specified.
interval: Specifies the number of seconds the overload bit remains set when the system starts up. Valid values range from 5 through 86400 seconds (24 hours).
wait-for-bgp: Specifies that the overload bit is set when the system starts up and remains set until BGP has converged.
max-bgp-wait-time: Specifies the maximum time in seconds that IS-IS waits for BGP convergence to complete. When the configured time interval is exceeded without BGP convergence, IS-IS exits the overload state. Valid values range from 5 seconds through 86400 seconds (24 hours). The default is 600 seconds (10 minutes).

Modes

IS-IS router configuration mode

Usage Guidelines

The no form of the command removes the configured overload state.

Examples

The following example sets the overload bit to on with immediate effect.

device# configure terminal
device(config)# router isis
device(config-isis-router)# set-overload-bit

The following example configures the device to set the overload bit on in all its IS-IS LSPs sent to other ISs during the first five seconds following a successful software reload. After the five seconds expire, the device resets the overload bit to off in all its IS-IS LSPs.

device# configure terminal
device(config)# router isis
device(config-isis-router)# set-overload-bit on-startup 60

The following example specifies that the overload bit is set upon system startup and remains set until BGP has converged and specifies that the device that 86400 seconds is the maximum time that IS-IS will wait for BGP convergence to complete.

device# configure terminal
device(config)# router isis
device(config-isis-router)# set-overload-bit on-startup wait-for-bgp 86400