Smlt Design - Avaya 8800 Planning And Engineering, Network Design

MPLS IP VPN and IP VPN Lite

SMLT design

To meet the design requirements, an Avaya Ethernet Routing Switch 8800/8600 is deployed at each
site. As shown in the following figure, the five Ethernet Routing Switch 8800/8600s are
interconnected using 10 gigabit Ethernet links in an SMLT cluster configuration. The Ethernet
Routing Switch 8800/8600s in the two main sites, which provide Internet connectivity to the network,
are the SMLT cluster nodes (which logically act as one switch) and are interconnected by a DMLT
IST connection. The remaining sites are connected as SMLT edge devices using an SMLT triangle
topology. VLACP is enabled on all links using long timers on IST links and short timers on SMLT
links. The maximum number of hops for traffic to reach a remote site is at most 2 hops and in some
cases 1 hop only.
Figure 123: SMLT design
With Avaya's advanced packet processor architecture, the Avaya Ethernet Routing Switch
8800/8600 always hardware switches all traffic flows including IP VPN traffic used in this design.
This means that if a nonblocking 10 gigabit hardware configuration is used (for example, using
8683XLR or 8683XZR 3-port 10GBASE-X LAN/WAN XFP modules), then full 10 gigabit bandwidth
and extremely low latency is available from site to site.
Furthermore, if 10 gigabit later becomes insufficient between any sites, you can increase the
bandwidth in this design by adding additional 10 gigabit links to the existing MLTs.
June 2016 Planning and Engineering — Network Design
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