The node generates this route type for advertising MAC addresses (and IP addresses if proxy-ARP/proxy-ND is enabled). The router generates MAC advertisement routes for the following entities:
learned MACs on SAPs, if the mac-advertisement command is enabled
conditional static MACs, if the mac-advertisement command is enabled
learned MACs on spoke-SDPs, if the mac-advertisement command is enabled
The unknown-mac-route command is not supported for EVPN-MPLS services.
The route type 2 generated by a router uses the following fields and values:
Route Distinguisher (RD)
This is taken from the RD of the VPLS service within the BGP context. The RD can be configured or derived from the bgp-evpn evi value.
Ethernet Segment Identifier (ESI)
This is zero (0) for MACs learned from single-homed CEs and different from zero for MACs learned from multi-homed CEs.
Ethernet tag ID
This is zero (0).
MAC address length
This is always 48.
MAC address
This is learned or statically configured.
IP address and IP address length
This is the IP address associated with the MAC being advertised with a length of 32 (or 128 for IPv6).
In general, any MAC route without IP has IPL (IP length) = 0 and the IP is omitted.
When received, any IPL value not equal to zero, 32, or 128 discards the route.
MPLS Label 1
This carries the MPLS label allocated by the system to the VPLS service. The label value is encoded in the high-order 20 bits of the field and is the same label used in type 3 routes for the same service, unless bgp-evpn mpls ingress-replication-bum-label is configured in the service.
MPLS Label 2
This is 0.
MAC mobility extended community
This is used for signaling the sequence number in case of mac moves and the ‟sticky” bit in case of advertising conditional static MACs. If a MAC route is received with a MAC mobility of ext-community, the sequence number and the ‟sticky” bit are considered for the route selection.