EVPN route type 2 — MAC/IP advertisement route

The 7210 SAS router 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 route type 2 generated by a router uses the following fields and values:

• Route Distinguisher

  This is taken from the route distinguisher (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.