HP 1606 Brocade Fabric OS Administrator's Guide v6.3.0 (53-1001336-01, July 20 - Page 541
Backbone-to-edge routing with Virtual Fabrics, Upgrade and downgrade considerations for FC-FC routing
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Upgrade and downgrade considerations for FC-FC routing 21 Backbone-to-edge routing with Virtual Fabrics Since the base switch does not allow F_Ports, you cannot have devices connected to the base switch. Even though F_Ports are not allowed in the base switch, they are allowed in an FC router in legacy mode (Fabric OS v6.1.x or earlier, or Fabric OS v6.2.0 or later with Virtual Fabrics disabled). If you connect an FC router in legacy mode to the base switch, backbone-to-edge routing is supported on that FC router. In Figure 78, no devices can be connected to the backbone fabric (Fabric 8) because base switches cannot have F_Ports. Figure 80 shows an FC router in legacy mode connected to a base switch. This FC router can have devices connected to it, and so you can have backbone-to-edge routing through this FC router. In this figure, Host A in the backbone fabric can communicate with device B in the edge fabric with FID 20; Host A cannot communicate with device C, however, because the base switches do not support backbone-to-edge routing. Physical chassis 1 Physical chassis 2 IFL E Logical switch 1 E ISL E Logical switch 5 F B (Default logical switch) (Default logical switch) Fabric ID 128 Fabric ID 128 Logical switch 2 Fabric ID 1 Logical switch 6 Fabric ID 1 Edge fabric FID 20 Allows XISL use Allows XISL use C F Logical switch 3 E ISL E Logical switch 7 E Fabric ID 15 E Fabric ID 15 IFL IFL EX Logical switch 4 EX Logical switch 8 EX A (Base switch) Fabric ID 8 E XISL (Base switch) E Fabric ID 8 E E ISL FC router Fabric ID 4 FIGURE 80 Backbone-to-edge routing across base switch using FC router in legacy mode Upgrade and downgrade considerations for FC-FC routing When you upgrade to Fabric OS v6.3.0 or later, EX_Ports remain functional and you can continue to perform all FC router operations on the switch. Brocade recommends that you save your FC-FC routing configuration (using the configUpload command) before performing any downgrades. For further instructions on downgrading, refer to Chapter 9, "Installing and Maintaining Firmware". Fabric OS Administrator's Guide 499 53-1001336-01
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