bier enable

Usage Scenario

In the scenario where a BIER tunnel is set up to carry multicast traffic, run the bier enable command in the IS-IS view to enable BIER. BIER can be enabled only if wide, compatible, or wide-compatible is configured in the cost-style command. After the command is run, it controls the local device to learn and advertise BIER topology information. With the configuration, local BIER sub-TLVs are advertised through corresponding routes, the BIER sub-TLVs in the routes learned from other devices can be learned, and the BIER sub-TLVs are retained during route leaking. The configuration does not affect flooding of BIER sub-TLVs through routes among the devices with the same IS-IS level.

Precautions

This command can be used to enable both BIER and BIERv6. However, the configuration of enabling BIERv6 takes effect only if the specified IPv6 topology is set to the ipv6 mode.

In earlier versions, BIERv6 is not supported, and BIER sub-TLVs cannot be retained during IPv6 route leaking even after the command is run.

BIER does not support route leaking. If this command is run, BIER sub-TLVs cannot be retained during IPv4 route leaking, and Level-1-2 devices generate only Level-2 BIER topology information and flood the BIER topology information to Level-2 neighbors.