Stacking Capabilities - Avaya 3500 Series Installation Instructions Manual

Installing the Avaya Ethernet Routing Switch 3500 Series
In the ERS 3500 Series, the stack ports can be used in one of two different modes and are not
reserved as stacking ports. The two modes are Standalone Mode and Stacking Mode.
Note:
Before adding switches to a stack, ensure that all switches for the stack have the same software
image installed, or that the Agent Auto Unit Replacement (AAUR) functionality is enabled on all
switches participating in a stack. AAUR automatically installs the stack software image to any
unit that has a dissimilar image. AAUR is enabled by default on a switch.
For more information about AAUR, see Quick Start Configuration for Avaya Ethernet Routing
Switch 3500 Series, NN47203-301

Stacking capabilities

Other than ERS3510GT, the Avaya Ethernet Routing Switch 3500 Series supports stacking
capability. The two rear ports on these models can be used in either standalone mode (default) or
stacking mode.
• Standalone Mode — In this mode, the switch rear ports function as follows:
- Provides two additional uplinks or connections to servers or power users and supports
regular port configuration parameters such as Spanning Tree, EAP, VLAN Tagging, MLT/
DMLT/VLACP, and port enable/disable
- Provides fixed port speed at 1000 Mbps Full Duplex operation with the insertion of a
supported SFP in the rear ports. Link and traffic indications are provided on the front left of
each switch where the LEDs for the rear ports illustrate "Down / 27" and "Up / 28" for the
ERS 3526T models, "Down / 25" and "Up / 26" on the ERS 3524GT models, "Down / 50" and
"Up / 51" on the ERS 3549GTS models, and "Down / 51" and "Up / 52" on the ERS 3550T
models as shown in the figures that follow.
• Stacking Mode — In this mode, the switch rear ports function as follows:
- Provides resilient stacking of up to eight stackable units when the two rear SFP ports are
configured for "stacking mode" operation.
- LEDs on the front panel of the switches indicate "Base Unit" selection and rear stack port
Up/Down connection status.
- Rear ports operate at 2.5 Gbps bandwidth (bi-directional) for an aggregate of up to 80 Gbps
for a stack of eight units.
September 2016 Installing Avaya Ethernet Routing Switch 3500 Series
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