CHAPTER 22

Configuring Upstream Disjoint Layer-2 Networks
Thischapter includes the followingsections:
•UpstreamDisjoint Layer-2 Networks, page 321
•Guidelinesfor Configuring UpstreamDisjoint L2 Networks, page 322
•PinningConsiderations for UpstreamDisjoint L2 Networks, page 323
•ConfiguringCisco UCS for Upstream Disjoint L2 Networks, page 324
•Creatinga VLAN for an Upstream Disjoint L2 Network, page 325
•AssigningPorts andPort Channelsto VLANs, page 327
•RemovingPorts and Port Channels from VLANs, page 328
•ViewingPorts and Port Channels Assigned to VLANs, page 329

Upstream Disjoint Layer-2 Networks

Upstreamdisjoint layer-2 networks (disjoint L2 networks) are required if you have two or more Ethernet
“clouds”that never connect, but must be accessed by servers or virtual machines located in the same Cisco
UCSdomain. For example, you could configure disjoint L2 networks if you require one of the following:
• Servers or virtual machines to access a public network and a backup network
• In a multi-tenant system, servers or virtual machines for more than one customer are located in the same
CiscoUCS domain and need to access the L2 networks for both customers.
Bydefault, data traffic in Cisco UCS works on a principle of mutual inclusion. All traffic for all VLANs
andupstream networks travels along all uplink ports and port channels. If you have upgraded from a
releasethat does notsupport upstreamdisjoint layer-2 networks,you mustassign theappropriate uplink
interfacesto your VLANs, or traffic for those VLANs continues to flow along all uplink ports and port
channels.
Note
Theconfiguration for disjoint L2 networks works on a principle of selective exclusion. Traffic for a VLAN
thatis designated as part of a disjoint network can only travel along an uplink Ethernet port or port channel
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