When configuring horizontal or primary slice stacking, observe the following:

•A brief network outage occurs when you change the domain stacking mode.

•The following connections must reside within their configured logical interconnect for proper functionality. These connections must not span outside of their logical interconnect:

o Network uplink ports ("Define Ethernet Network screen" on page 120) o Shared uplink sets ("Define Shared Uplink Set screen" on page 134)

o Monitored ports ("Ethernet Settings (Port Monitoring) screen" on page 93) o sFlow ports ("sFlow Settings (General) screen" on page 111)

When configuring networks, uplink ports are filtered to ensure that all ports belong to the same logical interconnect.

•If there are connections not configured as stacking links between modules, the ports are linked and function as normal uplink ports.

•Server to server communications between logical interconnects requires a connection between the logical interconnects.

•Multiple enclosure configurations are supported and requires the primary slices of the enclosures be connected with stacking cables.

•Profile migrations are not supported in multi-enclosure domains.

•Double-dense mode is not supported.

•HP BladeSystem c3000 Enclosures are not supported.

•HP recommends enabling Smart Link (on page 87).

Observe the following information when Ethernet modules are horizontally-adjacent:

•HP VC Flex-10 Enet modules

Uplink ports X7 and X8 form internal stacking links between the modules when left unpopulated.

•HP VC FlexFabric 10Gb/24-Port modules

Uplink ports X7 and X8 form internal stacking links between the modules when left unpopulated.

•HP VC Flex-10/10D Modules

Ports X11, X12, X13, and X14 are dedicated internal stacking links.

•HP VC FlexFabric-20/40 F8 Modules

Ports X9 and X10 are dedicated internal stacking links.

Determine the status of the stacking link:

•Connection Status indicates whether all of the VC-Enet modules within the domain are interconnected with stacking links and accessible. Lack of connection status to all VC-Enet modules results in a critical alert.

o OK indicates that all modules are connected.

o Failed indicates that one or more modules are not connected properly. Check the cable connections.

•Redundancy Status indicates whether all VC-Enet modules would remain fully interconnected if a module or external cable was removed or had failed. Horizontally-adjacent modules are considered to have OK redundancy status because of the reliability of their internal link.

o OK indicates that redundant/reliable connections exist.

Virtual Connect modules 232