Traffic Engineering

TE is a set of techniques for steering traffic along paths different from the shortest path computed by the IGP.

To enforce these paths, TE typically uses a form of source routing, such as MPLS labels or SRv6 extension headers, combined with path constraints, such as administrative groups or bandwidth requirements, and a method to map traffic to TE paths.

Use the commands below to configure link-level TE attributes (administrative groups and bandwidth) and enable TE in the IGP (specifically, IS-IS) so this information is distributed across the network.

Common link parameters

The following commands define link-level TE attributes that can be advertised by both IS-IS and OSPF (not supported yet).

set protocols traffic-engineering admin-group <admin-group-name> bit-position <0-31>

Configure an administrative group and associate it with a bit position.

These groups can then be referenced by the per-interface commands below.

Note

Two administrative groups cannot share the same bit-position value.

Example:

set protocols traffic-engineering admin-group primary bit-position 0
set protocols traffic-engineering admin-group backup bit-position 1

set protocols traffic-engineering interface <ifname> admin-group <admin-group-name>

Configure an administrative group on the specified interface.

You can configure multiple administrative groups on the same interface.

Example:

set protocols traffic-engineering interface eth0 admin-group primary

set protocols traffic-engineering interface <ifname> metric <1-4294967295>

Configure the TE metric for the specified interface (distinct from the OSPF/ISIS metric).

Example:

set protocols traffic-engineering interface eth0 metric 100

set protocols traffic-engineering interface <ifname> max-bandwidth <1-4294967295>

Configure the maximum bandwidth, in Mbps, for the specified interface.

Example:

set protocols traffic-engineering interface eth0 max-bandwidth 1000

set protocols traffic-engineering interface <ifname> max-reservable-bandwidth <1-4294967295>

Configure the maximum reservable bandwidth, in Mbps, for the specified interface.

Example:

set protocols traffic-engineering interface eth0 max-reservable-bandwidth 800

IS-IS TE configuration

The following commands enable TE for IS-IS.

set protocols isis traffic-engineering enable

Enable Traffic Engineering for IS-IS.

Example:

set protocols isis traffic-engineering enable

set protocols isis traffic-engineering export

Export the local TED to other FRR daemons.

Example:

set protocols isis traffic-engineering export

set protocols isis traffic-engineering address <ipv4-address>

Configure the IPv4 address used as the TE Router ID for MPLS-TE.

Example:

set protocols isis traffic-engineering address 198.51.100.1