Cisco ACI GOLF
The Cisco ACI GOLF feature (also known as Layer 3 EVPN Services for Fabric WAN) enables much more efficient and scalable ACI fabric WAN connectivity. It uses the BGP EVPN protocol over OSPF for WAN routers that are connected to spine switches.
All tenant WAN connections use a single session on the spine switches where the WAN routers are connected. This aggregation of tenant BGP sessions towards the Data Center Interconnect Gateway (DCIG) improves control plane scale by reducing the number of tenant BGP sessions and the amount of configuration required for all of them. The network is extended out using Layer 3 subinterfaces configured on spine fabric ports. Transit routing with shared services using GOLF is not supported.
A Layer 3 external outside network (L3extOut
) for GOLF physical connectivity for a spine switch is specified under the infra
tenant, and includes the following:
-
LNodeP
(l3extInstP
is not required within the L3Out in the infra tenant. ) -
A provider label for the
L3extOut
for GOLF in the infra tenant. -
OSPF protocol policies
-
BGP protocol policies
All regular tenants use the above-defined physical connectivity. The L3extOut
defined in regular tenants requires the following:
-
An
l3extInstP
(EPG) with subnets and contracts. The scope of the subnet is used to control import/export route control and security policies. The bridge domain subnet must be set to advertise externally and it must be in the same VRF as the application EPG and the GOLF L3Out EPG. -
Communication between the application EPG and the GOLF L3Out EPG is governed by explicit contracts (not Contract Preferred Groups).
-
An
l3extConsLbl
consumer label that must be matched with the same provider label of anL3Out
for GOLF in theinfra
tenant. Label matching enables application EPGs in other tenants to consume theLNodeP
externalL3Out
EPG. -
The BGP EVPN session in the matching provider
L3extOut
in theinfra
tenant advertises the tenant routes defined in thisL3Out
.