This information explains the types of uplinks that you can create in a fabric.
L2 uplinks
You can configure L2 uplinks only on the leaf switches in a fabric. L2 uplinks are a set of user-selected ports that belong to same VLT leaf switches in which the L2 network is applied. The L2 uplink from the leaf switches is either an LACP or a static port channel. SFS creates a VLT port channel for connected ports. If the ports are from a single device, the VLT port channel is a single armed VLT port channel. In case these ports exist on multiple switches, a VLT or port channel is formed across these ports. This port channel can be made as an access point for a VXLAN L2 network.
To avoid loops, SFS does not allow you to configure the same network on multiple uplinks.
L3 uplinks
You can configure L3 uplinks on a leaf or spine switch. SFS supports L3 routed or L3 VLAN uplinks.
With L3 routed uplinks, point-to-point links are required between the switches with L3 uplinks and the external switches. With L3 VLAN, all uplinks are in a port channel, and an IP address is assigned to the VLAN containing the port channel. Point-to-point IP networks and addresses must be planned for each physical link in the L3 uplink. Each leaf switch in the fabric needs an IP address on the external Management VLAN, and an anycast gateway address on the same VLAN. The virtual router or anycast gateway address is shared by all leaf switches in the fabric.
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