Link Redundancy; Multilink Trunking - Avaya 8800 Planning And Engineering, Network Design

HA mode and short timers
Prior to Release 5.0, protocols that used short timers could bounce (restart) during HA failover.
These protocols include VLACP, LACP, VRRP, OSPF, and STP. Release 5.0 introduces
enhancements that support fast failover for configurations that use short timers. In Release 7.0 and
later:
• All HA configurations support protocols with short timers and fast failover.

Link redundancy

Provide link layer redundancy to ensure that a faulty link does not cause a service interruption. The
sections that follow explain design options that you can use to achieve link redundancy. These
mechanisms provide alternate data paths in case of a link failure.
Link redundancy navigation
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MultiLink Trunking

• 802.3ad-based link aggregation
• Bidirectional Forwarding Detection
• Multihoming on page 72
MultiLink Trunking
MultiLink trunking is used to provide link layer redundancy. You can use MultiLink Trunking (MLT) to
provide alternate paths around failed links. When you configure MLT links, consider the following
information:
• Software Release 7.0 supports 128 MLT aggregation groups with up to 8 ports.
• Up to eight same-type ports can belong to a single MLT group. The same port type means that
the ports operate on the same physical media, at the same speed, and in the same duplex
mode.
• For Release 7.0, MLT ports can run between an 8648GTR and other module types. MLT ports
must run at the same speed with the same interface type, even if using different I/O module
types.
MLT navigation
• MLT/LACP groups and port speed
• Switch-to-switch MLT link recommendations
• Brouter ports and MLT
• MLT and spanning tree protocols
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Planning and Engineering — Network Design
Comments on this document? infodev@avaya.com
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Link redundancy
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