EVPN Type 6 (Selective Multicast Ethernet Tag Route) Explained

EVPN Type 6 Route is defined in IGMP and MLD Proxy for EVPN IETF draft. The purpose of this route is to distribute Host’s or VM’s intent to receive Multicast traffic for a certain Multicast Group (*,G) or Source-Group combination (S,G).

The format of Type 6 Route is shown below:

While most of the fields are self-explanatory, a couple require some special attention.

Ethernet Tag ID field must be set to the following values

• Zero if EVI is VLAN-Based or VLAN Bundle service
• Customer VID for the [EVI, BD ] if EVI is VLAN-Aware Bundle service without translation
• Normalized Ethernet Tag ID for the [EVI, BD] if EVI is VLAN-Aware Bundle service with translation

The Flag field is issued to communicate IGMP version information and is defined as follows:

Bit 4 (IE) is Include Group type (bit value 0) or an Exclude Group type (bit value 1) and is ignored if bit 5 (IGMPv3) is not set.