Base Switches Connected By An Xisl; Logical Isls Connecting Logical Switches - HP A7533A - Brocade 4Gb SAN Switch Base Administrator's Manual

Physical chassis 1
Logical switch 1 P1
(Default logical switch)
Fabric ID 128
P2
Logical switch 2
Fabric ID 1
Logical switch 3
Fabric ID 15
P5
P6
Base switch
Fabric ID 8
Figure 16

Base switches connected by an XISL

Traffic between the Logical Switches can now flow across this XISL. The traffic can flow only between
Logical Switches with the same fabric ID. For example, traffic can flow between logical switch 2 in chassis
1 and logical switch 6 in chassis 2, because they both have fabric ID 1. Traffic cannot flow between logical
switch 2 and logical switch 7, because they have different fabric IDs (and are thus in different fabrics).
Think of the Logical Switches as being connected with logical ISLs, as shown in
the logical ISLs are not connected to ports because they are not physical cables. They are just a logical
representation of the switch connections that are allowed by the XISL.
Physical chassis 1
Logical switch 1 P1
(Default logical switch)
Fabric ID 128
P2
Logical switch 2
Fabric ID 1
Logical switch 3
Fabric ID 15
P5
P6
Base switch
Fabric ID 8
Figure 17

Logical ISLs connecting Logical Switches

To be able to use the XISL, the Logical Switches must be configured to allow XISL use. By default, they are
configured to do so; you can change this setting, however, using the procedure described in
a Logical Switch for XISL use" on page 187.
NOTE: The default Logical Switch in the HP StorageWorks DC SAN Backbone Director or HP
StorageWorks DC04 SAN Director cannot use XISLs.
You can also connect Logical Switches using a combination of ISLs and XISLs, as shown in
diagram, traffic between the Logical Switches in fabric 1 can travel over either the ISL or the XISL. Traffic
between the other Logical Switches travels only over the XISL.
Physical chassis 2
P1
(Default logical switch)
P2
Logical switch 6
Logical switch 7
P6
XISL
P8
Physical chassis 2
P1
Logical switch 5
Logical ISL (Default logical switch)
P2
Logical switch 6
Logical ISL
Logical ISL
Logical switch 7
P6
XISL
P8
Logical switch 5
Fabric ID 128
Fabric ID 1
P4
P7
Fabric ID 15
P9
Base switch
Fabric ID 8
Figure
Fabric ID 128
Fabric ID 1
P4
P7
Fabric ID 15
P9
Base switch
Fabric ID 8
Fabric OS 6.2 administrator guide 179
17. In this diagram,
"Configuring
Figure 18. In this