Design for High Availability
Issue 3.4.1 June 2005
265
A similar approach assesses the availability in Cleveland, and is shown in
Table 58: Weighted
System Availability in Cleveland
.
As reflected in
Table 58: Weighted System Availability in Cleveland
, the main availability
bottleneck in this configuration is the single WAN link supporting the call control signaling
between the headquarters and either of the branch offices. Case Study II demonstrates the
effect of a LSP on improving the local availability for the branch offices.
Case Study II (99.6% Availability)
In this configuration, the call processing signaling traffic has higher availability value in the
Cleveland office. In addition, Atlanta IP traffic is enhanced by implementation of N+1 IP
resources.
●
The LSP in Cleveland is the alternate gatekeeper and call controller for the IP phones and
the G700 Media Gateways located in the Cleveland site.
●
N+1 IPSI, C-LAN and Media Processor circuit packs in Atlanta. This is done by distributing
the call control link to the port networks (the G650 media gateways) over two IP links,
supported by two IPSI circuit packs, and increasing the number of C-LAN circuit packs by
one. Such distribution of resources allows for IP phone service availability in the event of a
link or device failure.
Table 58: Weighted System Availability in Cleveland
Full Solution Availability Projected
Weighted Downtime minutes.
% of traffic generated in Atlanta
×
Annual
downtime minutes in Atlanta
(43.3% + 14.2%)
×
263 = 151
% of traffic generated in Boston
×
Annual
downtime minutes in Boston
(16% + 2%)
×
5260 = 947
% of traffic between Atlanta and Boston
×
Annual downtime minutes due to failure in
Atlanta, WAN, and in Boston
(5.2% + 5.2%)
×
5260 = 547
% of traffic generated in Cleveland
×
Annual downtime minutes in Cleveland
(7% + 0.4%)
×
5260 = 390
% of traffic between Atlanta and Cleveland
×
Annual downtime minutes due to failure
in Atlanta, WAN, and in Cleveland
(2.7% + 2.2%)
×
5260 = 258
% of traffic between Boston and Cleveland
×
Annual downtime minutes due to failure
in Boston, WAN, and in Cleveland
(0.9% + 0.9%)
×
5260 = 95
Aggregated Downtime
2388 minutes
(151 + 947 + 547 + 390 + 258 + 95)
System Availability = 99.5%
Summary of Contents for Application Solutions
Page 1: ...Avaya Application Solutions IP Telephony Deployment Guide 555 245 600 Issue 3 4 1 June 2005 ...
Page 20: ...About This Book 20 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 21: ...Issue 3 4 1 June 2005 21 Section 1 Avaya Application Solutions product guide ...
Page 22: ...22 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 106: ...Call processing 106 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 124: ...Avaya LAN switching products 124 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 139: ...Issue 3 4 1 June 2005 139 Section 2 Deploying IP Telephony ...
Page 140: ...140 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 186: ...Traffic engineering 186 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 204: ...Security 204 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 228: ...Avaya Integrated Management 228 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 274: ...Reliability and Recovery 274 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 275: ...Issue 3 4 1 June 2005 275 Section 3 Getting the IP network ready for telephony ...
Page 276: ...276 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 356: ...Network recovery 356 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 366: ...Network assessment offer 366 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 367: ...Issue 3 4 1 June 2005 367 Appendixes ...
Page 368: ...Appendixes 368 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 394: ...Access list 394 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 414: ...DHCP TFTP 414 Avaya Application Solutions IP Telephony Deployment Guide ...