Transcript Slide 1

Chicago PaDIRT Session 08/14/2007
Sprint/Nextel
Curtis Owings
Telecom Design Engineer
Roaming, MVNO, Pre-Paid Design
Sprint Proprietary - Internal Use Only
Slide 1
High-Level Sprint Network Design
1
6
Sprint Core
Reston
1
6
Sprint Core
Lenexa
2
5
2
5
3
3
4
Sprint Proprietary - Internal Use Only
4
Slide 2
Sprint Core functionality important to Data Roaming
Sprint Core
Lenexa
IOTA
Data
Link
WDR
AAA
Report
FW
BGP
 Delivery of services is minimized at the
Core as much as possible
 Redundancy between Cores and Distros
is maintained via OSPF and iBGP
 IP Over The Air: Sprint’s data provisioning
system delivered by IP
 Data Link: Private Corporate connectivity
product
 WDR AAA: Data Roaming AAA Proxies
 Report: The bulk reporting server
 FW: Firewalls
 BGP: Border Gateway routers connecting
Sprint to it’s partners worldwide via IP
Sprint Proprietary - Internal Use Only
Slide 3
Sprint Distribution Site functionality important to Data Roaming
 ALL 3G Data services are delivered
from a Distro Site
 Installed in redundant pairs where all the
services of one can be replicated in the
second
 All accounting starts here
 All subscribers are authenticated here
 All content is delivered here
 All Public IP’s in 68.28.0.0 /16
Sprint Sprint
Distribution
Distribution
Site
Site
PDSN
HA
AAA
DNS
Billing
Vision
WAP
Internet
EVDO
AN-AAA
LDAP
FW
Sprint Proprietary - Internal Use Only
Slide 4
Distribution Sites connection to the Internet
6
Sprint Core
Reston
6
Internet
(via Sprint Link)
Sprint Core
Lenexa
5
5
Sprint Proprietary - Internal Use Only
Slide 5
Data Roaming with the CRX
6
Roaming
Partner
Core/Network
Sprint Core
Reston
6
Internet
(via Sprint Link)
CRX
Network
Sprint Core
Lenexa
5
5
Sprint Proprietary - Internal Use Only
Slide 6
Data Roaming without the CRX
6
Sprint Core
Reston
Roaming
Partner
Core/Network
6
CRX
Network
Sprint Core
Lenexa
5
Internet
(via Sprint Link)
5
Sprint Proprietary - Internal Use Only
Slide 7
Really Big Bubbles
 Path from RP 2 to Sprint
Roaming
Partner
2
Roaming
Partner
3
− 2, 9000, 10507 (Shortest, Best)
− 2, 9000, 8000, 10507 (Valid, but longer)
 Path from RP 4 to Sprint
− 4, 47, 10507 (Shortest, Best) Cool!
 Path from RP 1 to Sprint
ISP
9000
Roaming
Partner
1
Roaming
Partner
4
ISP
8000
− 1, 47, 10507 (Shortest, Best)
− 1, 9000, 10507 (Oopsie! Same distance)
 For CRX partners NO OPTION is
acceptable other than the CRX
CRX
47
Sprint
10507
Roaming
Partner
5
− The path from RP 1 to ISP 9000 to Sprint is
never acceptable. No routing information for
AS 10507 should be listened to from ISP
9000.
− Filtering is the only way to guarantee route
integrity.
Sprint Proprietary - Internal Use Only
Slide 8
Sprint w/ Syniverse today
 Two AAA sites
 Two Bearer sites
 Two Syniverse owned routers in
each Sprint Core location
 Syniverse owned circuits
 Challenges
Sprint
Core
Reston
AA
AAA
Sprint
Dist
A
Syn
Seattle
Syn
Philly
MIP
SIP
A
SIP
MIP
AA
Syn
Atlanta
MIP
SIP
SIP
MIP
− Capacity Management: Who is
doing it?
− Line Management: Errors, stats,
metrics
− Packet Analysis
− Ticket Reporting
Sprint
Core
Lenexa
Syn
Tampa
AA
A
RP/SRA,
MVNO
Sprint Proprietary - Internal Use Only
Slide 9
Simple IP Support Issues and Other Issues
 Simple IP RADIUS Attributes
− Framed-IP-ADDR
− IP-Technology
− LNS-Pref
DNS
 NAI conventions
PDSN
− Common NAI
− Invalid realm names
AAA
 GMT Offset
− BSID attribute
 Testing challenges
LNS
RP
AAA
Billing
− Sprint has no SIP facilities
− Roaming partners reluctant to build labs
Cust
WAP
Internet
Sprint Proprietary - Internal Use Only
Slide 10
Other Projects
Roaming Partner re-designs
Enhanced Reporting
Enhanced Monitoring
Platform Upgrades
DNS Re-direction
New Services (WiMAX, LBS and QChat)
Sprint Proprietary - Internal Use Only
Slide 11