Design for High Availability
Issue 3.4.1 June 2005
263
Figure 75: Case Study I: Configuration of the Three Sites
The single WAN link is the weakest link in this configuration. Because WAN facilities are usually
leased, because they are not under an enterprise’s direct control, and because of the expense
involved in procuring WAN circuits, WAN availability has historically been in the range of 99% to
99.5%, although some service providers do offer SLAs guaranteeing 99.9% availability per
WAN circuit. Call control signaling traffic traverses the WAN link to give service to the phones in
Boston and Cleveland. As a result the availability of these two sites is no greater than the WAN
link.
Boston
Site 2: Branch Office
End Users: 648
IPSIs: 1
MedPros: 2
C-LANs: 2
Site 1: Headquarters
End Users: 1,755
IPSIs: 1
MedPros: 3
C-LANs: 5
PSTN
Atlanta
S8700
G650
G650
Cleveland
Site 3: Branch Office
End Users: 270
2 G700 Media Gateways
WAN
G650
cydfcas1.pdf KLC 121103
PSTN
PSTN
WAN Edge
Routers
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 ...