Summit X460 series stacking modules allow you to add two high-performance SummitStack ports to slot B on the rear panel of a Summit X460 series switch.

Caution
Stacking modules are not hot swappable. You must power down the switch before installing any stacking modules.These ports allow you to combine multiple units into a single SummitStack management entity, using stacking cables that are available from Extreme Networks.
Two stacking modules are available for the Summit X460 series switches:
| SummitStack stacking module | Provides two integrated 20-Gbps bidirectional stacking ports for stacking connections using Extreme Networks SummitStack cables. |
| SummitStack-V80 stacking module | Provides two unpopulated cages for QSFP+ optical modules or QSFP+ compatible active or passive cables. These ports support 20-Gbps bidirectional stacking connections. See Summit X460 Series Stacking Modules. |
