Cisco Cisco UCS B200 M2 Blade Server Libro blanco

Unique VSANs

UCS VSANs can be used to assign individual service profile vHBAs to specific FC uplinks, providing the ability to specify
which FC uplinks a service profile’s Fibre Channel traffic will traverse (Figure 6). VSANs are unique to Cisco devices and
therefore apply only to the uplink engineering component of Cisco to Brocade connectivity. The VSAN tag is recognized
internally within Cisco UCS and can be assigned to vHBAs and FC uplinks; however this tag will be ignored by the
Brocade devices.

Figure 6. Using Unique VSANs to Assign Service Profile vHBAs to Specific FC Uplinks

The following example illustrates how VSANs can be used for FC uplink traffic engineering:

1. VSAN 2 is created on UCS Fabric A, and VSAN 3 is created on UCS Fabric B.
2. Service profile Brocade_1 vHBA fc0 is assigned to VSAN 2 on Fabric A, and service profile Brocade_1 vHBA fc1 is

assigned to VSAN 3 on Fabric B.

3. Cisco Fabric Interconnect A FC uplink port x/x is assigned to VSAN 2 on Fabric A and is connected to Brocade Device

A/Fabric A, and Cisco Fabric Interconnect B FC uplink port x/x is assigned to VSAN 3 on Fabric B and is connected to
Brocade Device B/Fabric B.

4. Traffic originating from service profile Brocade_1 vHBA fc0 assigned to VSAN 2 in Fabric A will traverse FC uplink port

x/x assigned to VSAN 2 in Fabric A. Traffic originating from service profile Brocade_1 vHBA fc1 assigned to VSAN 3 in
Fabric B will traverse FC uplink port x/x assigned to VSAN 3 in Fabric B.

5. Other service profile vHBAs assigned to VSANs will traverse FC uplinks with matching VSAN assignments.