OSPF BIER support

SR OS supports the BIER TLV for OSPF. Each node uses the TLVs described in RFC 8444 to propagate the BIER information to the entire network. The peer nodes use this information to build their BIER Index forwarding table (BIFT).

OSPF does not support MT. Single BIER sub-domain per area is supported. Inside an area, BIER and virtual links are mutually exclusive.

Note: Although OSPF does not support MT, the user can create in the conf>router>bier context a BIER template with an SD using ipv4-multicast MT. However, the node does not use this SD and does not generate any OSPF TLV for this <SD, MT>. If the same BIER template contains an SD with ipv4-unicast MT, then that SD is used in OSPF.

Both IPv4-unicast and IPv4-multicast mt are supported for IS-IS (see IS-IS multi-topologies).

BIER is configured under OSPF using the template command from the config>router>ospf>area>bier context. For command details, see the 7450 ESS, 7750 SR, 7950 XRS, and VSR Classic CLI Command Reference Guide.