SFS uplink options to external network switches include:
The decision to use L2 versus L3 uplinks should be made based on the L3 termination of networks. When L2 uplinks are used, all routing functionality needs to happen in the external router. This means that when new networks are automatically provisioned in the fabric, the external routers must be updated with the new networks and gateway configuration for that network.
If L2 uplinks are used, determine the VLAN ID to use for external management, and whether it will be tagged or untagged. Typically, this is the same VLAN used for DNS and NTP services on the existing network, as shown in the example in this guide. Optionally, traffic may be routed from the external switch to the DNS/NTP servers.
The L2 uplink may be an LACP or static LAG. If L2 uplinks connect to a pair of Dell EMC PowerSwitch systems, Dell EMC recommends using LACP with VLT per the example in this guide.
L2 uplink configuration is covered in detail in Configure L2 uplinks to the external network.
SFS supports using L3 routed or L3 VLAN uplinks.
With L3 routed uplinks, each physical link is a point-to-point IP network. With L3 VLAN, all uplinks are in a LAG, and an IP address is assigned to the VLAN containing the LAG. This guide provides examples using L3 VLAN uplinks. L3-routed examples are beyond the scope of this guide.
Each leaf switch in the SmartFabric needs an IP address on the External Management VLAN. An anycast gateway address on the same VLAN is also specified. This is the virtual router/anycast gateway address that is shared by all leafs in the SmartFabric.
SmartFabric supports routing using eBGP or static routes. The static routing example is provided in this guide.