5.6.x HP X9000 Series Network Storage System Installation Guide (TA768-96056, December 2011)

The following example shows an X9720 cabled to a redundant switch pair.
Each Virtual Connect bay connects to a separate switch to provide for VC and external switch
redundancy.
Following are examples of redundant switch configurations for the X9720:
• Two independent switches
• Two physical switches that are part of a clustered pair
• Two blades within a redundant switch chassis
Cabling examples including LACP link aggregation
The X9720 supports LACP/802.3ad link aggregation to external switches through the Virtual
Connect bays. However, LACP link aggregation groups (LAGs) cannot be formed spanning across
VC bays. In addition, LACP links cannot be formed across independent switches. This leads to the
default configuration of connecting each VC to a specific switch and not cross-wiring between VCs
and external switches.
Redundant switch pairs
The cabling in the following diagram includes LACP link aggregation and uses independent
switches.
76 Network best practices for X9720 systems