Brocade Network OS Administrator’s Guide v4.1.1 - Manual (Page 60)

ISSUs are supported in both fabric cluster mode and logical chassis cluster mode for the following
downgrade path: 4.1.0 to 4.0.1
High Availability behavior during ISSUs is the same as that of warm recovery described in HA failover
on page 59. For more information, refer to Upgrading firmware on a modular chassis on page 112.
Switch fabric modules
The switch fabric modules play a dual role in the fabric connectivity between line cards, providing both
the data-plane connectivity and the control-plane connectivity needed for end-to-end credit
management in each of the line cards.
In each chassis model, two slots are designated for supporting the control-plane connectivity. In the
Brocade VDX 8770-4, the slots S1 and S2 are the designated control-plane slots. In the Brocade VDX
8770-8, the slots S3 and S4 are the designated control-plane slots. At least one of the control-plane
slots must be populated to maintain operation. If you remove the switch fabric modules from both the
control-plane slots, all line cards will be faulted and the chassis is no longer operational.
Line cards
The following line cards provide I/O ports for network Ethernet protocols:
• LC48x1G - forty eight 1-GbE/10-GbE SFP+ front ports.
• LC48x10G - forty eight 1-GbE/10-GbE SFP+ front ports.
• LC12x40G - twelve 40-GbE QSFP front ports.
• LC48x10G-T - forty eight 10 Gbps Base-T front ports.
• LC27x40G - twenty seven 40-GbE QSFP front ports.
• LC6x100G - six 100-GbE front ports.
Line card interface ports are named as follows:
• The 10-GbE interfaces are named "TenGigabitEthernet" or "TE".
• The 1-GbE interfaces are named "GigabitEthernet" or "GE".
• The 40-GbE QSFP interfaces are named "FortyGigabitEthernet" or "FO".
Supported interface modes
All interfaces in the Brocade VDX 8770 chassis come online as Fabric Inter-Switch Links ("Fabric
ISLs") by default and will attempt to form a Brocade VCS fabric. If the ISL formation fails, the
interfaces come up as "Edge ports".
NOTE
The Brocade VDX 8770 chassis always comes up in VCS mode. Standalone mode is not supported
on the Brocade VDX 8770 platform.
Switch fabric modules
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