A vital component of Avaya Aura® is Communication Manager (AACM), an industry best-in-class redundant server solution that takes into consideration the available uptime today’s businesses demand. This is accomplished by utilizing the high availability standard of nines percentage approach, for AACM the availability is “Greater than 5 Nines” or 99.999%+.
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Avaya Aura® Communication Manager Greater than 5 Nines Availability
1. avaya.com | 1
Avaya Aura® Communication Manager
Greater than 5 Nines Availability
Table of Contents
Executive Summary....................1
Linux Based Software….............1
Survivable Core………..................2
Survivable Remote Branch......3
SIP and TDM Availability…...…4
High Availability WAN/LAN…....4
Conclusion………………………………5
Executive Summary
A vital component of Avaya Aura® is Communication Manager
(AACM), an industry best-in-class redundant server solution that
takes into consideration the available uptime today’s businesses
demand. This is accomplished by utilizing the high availability
standard of nines percentage approach, for AACM the availability
is “Greater than 5 Nines” or 99.999%+. The uptime percentage of
99.999%+ equates into a downtime calculation of only 5.26
minutes or less per year. To achieve this level of availability
performance AACM’s has been developed with key differentiators
over the competition. Differentiators include best-in-class secure
Linux software,
duplicated mirrored
core servers, fully-
replicated remote
core server/servers,
and fully-replicated
remote branch
failover servers.
Avaya’s high
availability performance is the same for both Communication
Manager Non-Virtualized and Virtualized Environments.
Linux Based Software
Avaya Labs is continuously improving Avaya’s Linux based
operating-system software, known throughout the industry for
customized capabilities which monitor themselves, delivering built-
in intelligence including self-healing abilities at all levels. Because
Avaya software is Linux secured, there are fewer vulnerabilities
than competitive software operating systems, adding to the
99.999%+ availability equation. Avaya Linux based software is the
foundation of the ultra-reliable Avaya Aura Core including Session
Manager. AACM duplicated server pairs support memory
2. avaya.com | 2
shadowing. This allows full call preservation during server
interchange (no interruption in service). This is a unique advantage
over Avaya’s main competitor because capabilities during an
established call like Transfer, Hold and Conference can still take
place during CM-to-CM switching. Software upgrades and patches
can be performed while staying in operation and more importantly
additions, moves, changes can be performed on either server pair
and replicated back without service interruption, another advantage
over our main competition and another element of high availability.
Survivable Core
Well-planned, high availability solutions include geographically-
redundant Data Centers with a backup survivable core. Main Data
Centers can experience service outages due to natural disasters,
hardware failure, software failure, sabotage or through other
means. With AACM and Avaya Aura Session Manager (AASM) in
the diagram below, the survivable core includes a single server
solution. Utilizing the Avaya Aura Virtualized Environment, only
(3) servers are necessary to provide full featured stateful failover
capabilities with automatic failback.
Unique to Avaya administration can be applied at Data Center 2
during failover mode. Another advantage is AACM and AASM
survivable cores can be supported anywhere on the globe with
1,000 millisecond delay. Our main competitor is limited to 80
millisecond delay or only 1,900 miles. That’s a problem with 2,475
air miles coast to coast in the continental US. In the case of
another competitor, when software is upgraded to new releases,
the data center cores must be taken offline to install their new
core. This causes a complete out-of-service interruption limiting
them to no better than 99.9% availability across typical lifecycle.
Avaya Aura platform
includes Mission
Critical Linux software
for a “Greater than 5
Nines” solution
providing businesses
the benefits to
optimize their next
generation
collaboration solutions
Unique to Avaya
additions, moves and
changes can be made
when the Survivable
Core is active, a benefit
Avaya’s main
competitor cannot
provide
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Survivable Remote Branch
Avaya’s Survivable Remote Branch is a green-friendly S8300
Server media module blade that fits into either the G430 or
G450 Gateway. S8300 is green-friendly for two reasons: 1)
Smaller footprint because the S8300 blade is contained inside a
G4xx Gateway; and 2) The S8300 media module consumes only
30W compared to normal server averages of 150W. With a
complete loss of the WAN or Data Centers 1 & 2, the
Survivable Remote Branch takes over, functioning like a
standalone system with SIP and/or TDM Trunking capabilities.
Other business benefits include the following:
Full feature capabilities including Contact Center, vectors,
and announcements;
Programming complexity is eliminated with survivable
remote. Businesses benefits with lower TCO because you only
need single touch administration at the main location;
Upgrades and patches are pushed out from main location to
survivable remotes another savings that reduces multiple onsite
touches;
Survivable Remote Branch contains full backup translations
of the AACM Main Server pairs;
Connection preserving failover/fall back, calls between two
or more parties are not dropped with SIP sessions and/or local
TDM Trunking.
What do we experience in Survivable Remote Branch?
Downtime per year 2-3 WAN/LAN outages x 3 minutes x 5%
=18 to 27 seconds
Average downtime experienced per end user as the result of WAN
failure events (1- (27 seconds)/ (seconds in a year)) =99.99991%
Include server/survivable remote and power/environment
availability
Branch Availability over redundant WAN link:
99.9998% x 99.99955% x 99.99991% = 99.9993%
Note in Avaya labs testing the detection and failover completed on
average in less than 2 minutes.
Competitive
Advantage: AACM and
AASM survivable cores
can be supported
anywhere on the globe
with 1,000 millisecond
delay.
Avaya Aura products
are designed to
continue service in the
face of many failure
events. Stable calls
stay up in the event of
loss of connectivity to
the primary server. IP-
phones and gateways
do not lose registration
in the event of short
network outages. Such
resiliency is captured
in the mathematical
model in assessing
total system
availability.
4. avaya.com | 4
SIP and TDM Availability
Avaya Aura® Session Manager employs Internet Engineering Task
Force (IETF) standard RFC 5626 to deliver multiple, simultaneous
registrations to SIP endpoints. Avaya and RFC 5626-compliant SIP
endpoints can register with multiple core Session Managers and with
Survivable Remote Branch for simultaneous registrations. Combined
with Avaya’s unique application of the SIP Timer “B” and
OPTIONs messaging, calls can be placed during network outages
without dropping, and with a delay of only two seconds or less.
Session Manager also supports Network Interface Card (NIC)
bonding and up to 10 geo-redundant Session Manager instances. SIP
and TDM Trunking complement each other in case one or the other
services are lost from the PSTN. TDM Trunking is distributed
across G4xx Gateways for another layer of high availability. High
availability cannot be accomplished without the PSTN and the ratio
between SIP and TDM trunks should be engineered and balanced
according to business requirements.
High Availability LAN/WAN
For the purpose of meeting high availability, the recommended
network topology should consist of a redundant LAN/WAN with
building blocks of layered routers and switches. Multiple paths or
link redundancy minimize disruption of service due to LAN/WAN
failure events, link congestions, denial of service attacks, etc. When a
failure in one link is detected, traffic will switch over to the healthy
link. Link redundancy also accommodates the move of an endpoint
or gateway from one switch to another.
*According to the methodology recommended by Telcordia GR-2813-CORE, Software Reliability Prediction
Avaya Aura Session
Manager supports Call
Preservation in the
event of a network or
Session Manager
failure in the core.
This capability allows
calls in queue in a
Contact Center to be
processed in the
normal way without
any interruption or
loss in service.
Software quality check
and assessment of
software reliability:
Avaya carefully
examines every step of
software development
by measuring faults
during coding phase
the data used in
assessing software
reliability prediction*
analysis involves
measuring software
field performance data
of over 12,000 systems
in the field.