Transcript Clearing the Way for VoIP in the Branch Office

Liad Ofek
Vice President, Technical Services
Expand Networks
Clearing the Way for VoIP in the Branch




What’s the Hidden Cost?
The promise and the reality of VoIP
VoIP challenges in the Branch Office
The Expand Compass Solution for VoIP
deployments
Conflicting Commercial & User Requirements
80%
87% of
Users are
Remote!





Corporate HQ
Remote User


HQ
Cost-reduction
Simplicity
Consolidation
Business Continuity
Regulatory Compliance
REMOTE
Globalization
Productivity
Remote User


San Francisco Remote
User annoyed
Poor response time
Remote User


London Remote
User frustrated
High support
costs

Tokyo Remote
User
gives up

Lack of
productivity
The Promise of Voice/Video and Data
Convergence







Reduces cost
Simplifies management
Provides enhanced features
Delivers greater mobility for the distributed business
Provides same quality as PSTN calls
Converged Voice, Data, Video – unified infrastructure for featurerich applications
Convergence made easy and even more cost-effective with MPLS
(Multi-protocol packet switching)
Voice/Video Over IP are here to stay…BUT...
The Reality
 The WAN limits the success of Convergence


Low speed links for remote sites – 128kbps, 512kbps, T1’s/E1’s
Low visibility for existing application bandwidth consumption
 Performance challenges



Unacceptable voice quality
Greedy and bursty competing applications
MPLS access points are still congested…QoS is not enough
 More data is thrown over the WAN



Server consolidation
Web services
Disaster recovery
 Voice is not the only business critical application

Other data applications can’t be degraded to improve voice quality
More Applications Deployed To The
Branch
______
1011
______
0100
 87% of employees work from
the branch (Nemertes, 2004)
 New applications



Email
Internet / Intranet
VoIP
 Same WAN




Frame Relay
Leased lines
IP VPN
MPLS
1010
______
______
0101
______
1001
______
0101
WAN
Remote Branch Challenges
Insufficient Capacity
and Burst
Remote Branch Challenges
Insufficient Capacity
and Burst
Latency and Chatty
Applications
Remote Branch Challenges
Insufficient Capacity
and Burst
Latency and Chatty
Applications
Intermittent Connectivity
and Packet Loss
Remote Branch Challenges
Insufficient Capacity
and Burst
Latency and Chatty
Applications
Intermittent Connectivity
and Packet Loss
Congestion and Greedy
Applications
The Complete Technology
Solution for VoIP
WAN Optimization
Compression - reduce
data over the WAN:
free up the WAN
capacity for Voice


WAN Compression
Gigabyte Caching
Best-of-breed WAN Compression
 Patented algorithms
 Byte-level caching
 Packet header
reduction
 Adaptive packet
compression
 Fully transparent
WAN
Next-Generation WAN Compression
 When data
repeats, content is
delivered from the
edge
 The “bandwidth
effect”
WAN
WAN Throughput Improvements
 Increase WAN capacity



Benefits all applications
Transparent to WAN, applications,
servers and users
Alternative to WAN upgrades
with a 3 – 9 month ROI
0%
200%
400%
We have literally been able to trick our
56Kbps lines into behaving like T1s
– Julie Williams, VP & Compliance Officer
First National Bank Iowa
600%
800%
1000%
1200%
Microsoft Exchange
Typical
Lotus Notes
Improvements
SAP
NetBIOS
Peak
Intranet
Improvements
Web
XML
Disaster Recovery
Citrix
0%
2X
4X
6X
8X
Additional WAN capacity
10X
12X
WAN Optimization
QoS - Guarantee voice
quality





Shaping
Traffic priority
MPLS tagging
Policy scheduling
Bandwidth limitation
QoS - Gain Application Control
 Prioritize and control apps



Guaranteed, min/max bandwidth for key
applications
Control/block rogue applications
Seamless integration with other
optimization services
We were able to configure VoIP
QoS with a simple configuration at
30% less than the Telco cost
–Jacob Nielsen, Network Administrator
Brenntag Nordic
Acceleration
Optimize all applications to improve
application response time
Application Acceleration






Voice Optimization
(Fragmentation)
HTTP Acceleration
FTP Acceleration
DNS Acceleration
HTTPS Acceleration
Citrix Acceleration
Protocol Acceleration


TCP Acceleration
SCPS Reliability
How Does Voice Optimization Work ?
H
H
H
H
H
H
H
H
H
H
 If applications sharing a low bandwidth link include FTP and
VoIP, small VoIP packets may be delayed
 Fragmentation will sub-divide the large packets and insert the
small
 Reassembly performed at remote Accelerator
 Applied only to QoS default and low priority queues
Visibility & Management
Visibility for VoIP performance
ExpandView




Central Management
Inventory & License Management
Global Visibility
Ease of Deployment
Application & Network Visibility



Automatic Application Discovery
NetFlow
SLA Management
Visibility Into Application Performance
 Visibility for World-class NOCs



Network, application & performance
statistics
Application performance and alerting
Network trending and analysis
…more impressive were the
monitoring capabilities that offered indepth visibility & enabled us to tune
the performance of Microsoft Office
–Ovvyng Harewood, IT Director for the Ministry of
Finance, Gov of Barbados
Security
Encryption


IP Sec Tunneling
3 DES
AAA





Authentication
Authorization
Accounting
RADIUS
TACACS+
WAFS (Wide Area File Services)
Will VoIP be affected by server
consolidation ?
 Terminate CIFS protocol locally
(proxy) to eliminate “chattiness”
over the WAN
 Cache the objects to provide
LAN-like performance
 Consolidate other RBO services
to provide LAN performance
(print, DNS, DHCP, Etc.)
How Does WAFS Work?
Summary
 Merging voice and data networks can cause
significant problems which can offset the financial
benefits of VoIP if not addressed properly
 Technologies like compression, QoS, protocol and
application acceleration, and monitoring are
essential to establishing VoIP as an integral
application for the branch