Network Redundancy; Modular Network Design For Redundant Networks - Avaya 8800 Planning And Engineering

Redundant network design
Multihomed hosts can be connected to port-based, policy-based, and IP subnet-based VLANs.
The IP addresses that you associate with a single MAC address on a host must be located in
the same IP subnet. The Ethernet Routing Switch 8800/8600 supports multihomed hosts with
up to 16 IP addresses per MAC address.
For more information about multihoming, see Avaya Ethernet Routing Switch 8800/8600
Configuration — VLANs and Spanning Tree, NN46205-517.

Network redundancy

Provide network redundancy so that a faulty switch does not interrupt service. You can
configure mechanisms that direct traffic around a malfunctioning switch. The sections that
follow describe designs you can follow to achieve network redundancy.
Network redundancy navigation
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Modular network design for redundant networks

• Network edge redundancy
• Split Multi-Link Trunking
• Routed SMLT
• Switch clustering topologies and interoperability with other products
Modular network design for redundant networks
Network designs normally depend on the physical layout and the fiber and copper cable layout
of the area. When designing networks, Avaya recommends that you use a modular approach.
Break the design into different sections, which can then be replicated as needed using a
recursive model. You must consider several functional layers or tiers. To define the functional
tiers, consider campus architectures separately from data center architectures.
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November 2010