Determining the Number and Types of Leaf Switches Required in the IP Fabric
Leaf Switch
Cisco Nexus 92160YC-X
switch
For example:
• For 90 10-Gbps endpoints, you need three Cisco Nexus 92160YC-X leaf switches because each
• For 30 40-Gbps endpoints, you need two Cisco Nexus 9236C leaf switches because each switch can
4 Make sure that the uplink bandwidth (toward the spine switch) and the downstream bandwidth (toward
the endpoints) are equal.
a Use this equation to determine the uplink bandwidth:
Uplink Capacity per Leaf Switch x Number of Leaf Switches = Uplink Bandwidth
For example:
400 Gbps (uplink capacity for each Cisco Nexus 92160YC-X switch) x 3 Cisco Nexus 92160YC-X
leaf switches = 1200-Gbps uplink bandwidth
1000 Gbps (uplink capacity for each Cisco Nexus 9236C switch) x 2 Cisco Nexus 9236C leaf switches
= 2000-Gbps uplink bandwidth
1200-Gbps uplink bandwidth (for 3 Cisco Nexus 92160YC-X leaf switches) + 1200-Gbps uplink
bandwidth (for 2 Cisco Nexus 9236C leaf switches) = 2400-Gbps total uplink bandwidth
b Use this equation to determine the downstream bandwidth:
Endpoint Capacity per Leaf Switch x Number of Leaf Switches = Downstream Bandwidth
For example:
40 x 10-Gbps (400-Gbps endpoint capacity) for each Cisco Nexus 92160YC-X leaf switch x 3 leaf
switches = 1200-Gbps downstream bandwidth
25 x 40-Gbps (1000-Gbps endpoint capacity) for each Cisco Nexus 9236C leaf switch x 2 leaf switches
= 2000-Gbps downstream bandwidth
1200-Gbps downstream bandwidth (for 3 Cisco Nexus 92160YC-X leaf switches) + 1200-Gbps
downstream bandwidth (for 2 Cisco Nexus 9236C leaf switches) = 2400-Gbps total downstream
bandwidth
5 If the total uplink bandwidth and downstream bandwidth are equal, your topology is valid. You can now
determine the number of achievable flows. If the uplink bandwidth and downstream bandwidth are not
equal, you must rework your topology until it is valid.
Using the examples provided in this section, the topology would look like this:
Cisco Nexus 9000 Series NX-OS IP Fabric for Media Solution Guide, Release 7.0(3)I4(2)
8
Endpoint Capacity
40 x 10-Gbps endpoints
switch can support up to 40 10-Gbps endpoints.
support up to 25 40-Gbps endpoints or one Cisco Nexus 9272Q leaf switch because each switch can
support up to 36 40-Gbps endpoints.
Setting Up the IP Fabric for Media
Uplink Capacity
4 x 100-Gbps (400-Gbps) uplinks
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