Introduction to NG MVPN over BIER

In the NG MVPN over BIER scenario, BIER is used to encapsulate multicast VPN traffic and send the traffic to nodes in the BIER domain.

The differences between the NG MVPN over BIER scenario and the traditional NG MVPN scenario lie in the public network tunnels that carry MVPN traffic. Table 1 shows the differences between NG MVPN over BIER and NG MVPN over mLDP P2MP/RSVP-TE P2MP in carrying MVPN traffic.

**Table 1** Comparison between NG MVPN over BIER and NG MVPN over mLDP P2MP/RSVP-TE P2MP
Implementation	NG MVPN over BIER and NG MVPN over mLDP P2MP/RSVP-TE P2MP
NG MVPN control messages	The difference lies in the tunnel information carried in MVPN A-D routes. For details, see the following sections.
NG MVPN routing	There are no differences.
MVPN membership autodiscovery	There are no differences.
I-PMSI tunnel establishment	The tunnel attributes carried in routes during I-PMSI tunnel establishment are different.
S-PMSI tunnel establishment	The tunnel attributes carried in routes during S-PMSI tunnel establishment are different.
NG MVPN in transmitting multicast traffic	The packet encapsulation formats are different.
Typical NG MVPN deployment scenarios on the public network	NG MVPN over BIER supports only intra-AS intra-area scenarios. NG MVPN over mLDP supports four scenarios: intra-AS intra-area, intra-AS inter-area nonsegmented, intra-AS segmented, and inter-AS nonsegmented scenarios. NG MVPN over RSVP-TE P2MP supports intra-AS intra-area and intra-AS segmented scenarios.