Configuring an IS-IS Process to Advertise IPv4 Packet Loss Rates

Configuring an IS-IS process to advertise IPv4 packet loss rates helps ensure that service traffic is transmitted along the path with the lowest packet loss rate.

Prerequisites

Before configuring an IS-IS process to advertise packet loss rates, complete the following tasks:

Run the cost-style command to set the IS-IS cost style to wide, wide-compatible, or compatible.
Run the traffic-eng command to enable IS-IS TE.

Context

Traditional path computation algorithms compute the optimal path to a destination address based on costs. However, this path may not be the one with the lowest packet loss rate. For services that have stringent requirements on the packet loss rate, path computation can be performed based on packet loss rates instead of costs to ensure that service traffic is transmitted along the path with the lowest packet loss rate. Specifically, configure an IS-IS process to advertise IPv4 packet loss rates. After this function is configured, IS-IS collects and floods information about intra-area IPv4 packet loss rates, and BGP-LS reports the information to the controller. The controller then computes the optimal path on the P2P network based on the packet loss rates.

Procedure

Run system-view
The system view is displayed.
Run isis [ process-id ]
An IS-IS process is created, and its view is displayed.
Run cost-style { wide | wide-compatible | compatible }
An IS-IS cost style is set.
Run traffic-eng [ level-1 | level-2 | level-1-2 ]
IPv4 TE is enabled for a specified level of the IS-IS process.
Run metric-link-loss advertisement enable [ level-1 | level-2 | level-1-2 ]
The function of advertising IPv4 packet loss rates is configured.
(Optional) Run metric-link-loss suppress timer timer-value percent-threshold percent-value absolute-threshold absolute-value
Suppression parameters are configured for packet loss rate advertisement.

The advertised packet loss rates may be dynamic ones measured using TWAMP Light or static ones manually configured.

The valid dynamic packet loss rates measured using TWAMP Light are advertised only to the IS-IS interface bound to the TWAMP Light test session.

After receiving packet loss rate information, IS-IS advertises and floods the information.
Run commit
The configuration is committed.

Verifying the Configuration

After configuring the function, verify the configuration.

Run the display isis interface verbose traffic-eng command to check information about IS-IS-enabled interfaces.
Run the display isis traffic-eng advertisements command to check the TE information advertised by IS-IS.