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Status Report of TWIX
(TaiWan Internet eXchange)
Data Communication Business Group
Chunghwa Telecom
Speaker: Eugene L. Chang
September, 2002
Agenda
 A Quick View of IX’s in Taiwan
 TaiWan Internet eXchange (TWIX)
OAM (Operation and Maintenance) of TWIX
 TWIX Network Architecture

TWIX Public Peering
 TWIX Private Peering
 TWIX Components
 TWIX Services (Provisions, Facilities, Maintenance)
 General Requirements for Participants
 Installation Procedures and access stats
 TWIX Members
 TWIX Traffics

 Current IX Issues in Taiwan
 TWIX Futures
A Quick View of IX’s in Taiwan
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3 Major IX centers in Taiwan:
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Number of IX members:
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TWIX (TaiWan Internet eXchange)
TPIX (TaiPei Internet eXchange)
TWNAP (TaiWan Network Access Point)
TWIX :38
TPIX : 13
TWNAP : 16
Aggregated Traffics:
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TWIX : max/avg = 1400/1100 Mbps
TPIX : max/avg = 90/ 60 Mbps
TWNAP : (unknown)
OAM of TWIX
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Enabling ISPs in Taiwan to exchange traffics in a
secure and reliable way through the deployment
of the scalable interconnection system.
Service provided since November 21, 1997.
Provides Multi-Lateral Peering (MLP) and BiLateral Peering (BLP)
Members exchange route updates and extended
attributes conforming to BGP4 (RFC-1771).
OAM of TWIX (cont’d)


Each route updates are reflected to 2 route
servers (route reflectors).
Every member who joined MLP agrees to the
interconnect/provisioning policies enlisted by
TWIX.
TWIX Architecture
TWIX
Route Reflector
Router (Primary)
TWIX
Route Reflector
Router (Secondary)
Ethernet
Switch
Ethernet
Switch
FE,1/3GE,or GE
ISP
Colocated
Router
ISP
FE,1/3GE,or GE
ISP
Colocated
Router
Cross
Connect
FE,1/3GE,or GE
ISP
Colocated
Router
CSU/DSU
CSU/DSU
CSU/DSU
DS1,DS3,or
STM-1
DS1,DS3,or
STM-1
DS1,DS3,or
STM-1
CSU/DSU
CSU/DSU
CSU/DSU
ISP
ISP
TWIX Public Peering
Route Reflector
Router (Primary)
Route Reflector
Router (Secondary)
Ethernet
Switch
Ethernet
Switch
Link for
Public Peering
ISP 1
Colocated
Border Router
ISP 2
Colocated
Border Router
ISP N
Colocated
Border Router
HiNet
TWIX Private Peering
Public Peering
HiNet
ISP 1 Colocated
Border Router
Private Peering
Between
HiNet and ISP 1
(A layer-1/2
Cross-connect)
TWIX Components
(1) Ethernet Switch (E/S)
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Catalyst 6500’s
Provides 10/100/1000 Mbps access.
Peering members are asked to colocate members’ own border
routers in TWIX.
(2) Routing Reflector (RR)
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Cisco 3640’s (Primary + Secondary)
Supports:
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RFC 1966: BGP Route Reflection: An Alternative to Full-Mesh IBGP
RFC 1997: BGP Communities Attribute
Public peering members can only send/receive updates/
advertisements via RRs.
Route dampening.
(3) Network Management System (NMS) :
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Real-time management of the facilities.
Logging of inactive/flapped neighbors.
Abnormal behaviors detection (e.g. excessive prefixes)
TWIX Components (cont’d)
(4) Web server :
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Used as troubleshooting interface for all TWIX members.
System maintenance and/or other important messages are
posted.
Periodic traffic-monitoring for each IX port from the
members.
TWIX members can check traffic utilization through secure
logon.
Looking-glass webpage helps to isolate/workout the troubles.
TWIX Services
I. Provisioning
1. Dedicated account manager and implement
engineer are assigned in charge of consulting and
interconnection issues before the installation to
shorten the provision lead-time.
2. After TWIX members colocate their equipments
(i.e. border routers) in TWIX, the TWIX staff will
complete the necessary configuration and cabling
tasks regarding to the peering (either public peering
or cross-connect) in less than two working days.
TWIX Services
II. Facility
1. Electricity and Air Condition
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Equipped with AC UPS power supply.
Diesel-powered generators are used for backup.
Monitoring of temperature/humidity in TWIX.
2. Security on the room access
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TWIX is in 24-hour security surveillance and monitoring.
Two-level of entrance controls.
Other necessary measures from disastrous accidents. (e.g.
fire)
3. Networking Hardware

Central equipments are all designed and implemented with
redundancy.
TWIX Services
III. Maintenance
1. Call for Troubleshooting
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Provides 7x24 troubleshooting and help-desk.
Helps to identify and coordinate the personnel needed to workout
the outages.
2. Technical Consulting
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Features with qualified technical staff to co-work with the members.
Consulting services are provided in pre-/post-installation phases.
3. Information

The TWIX website (www.twix.net.tw) provides the traffic statistics,
member list, contact personnel, system announcements, etc.
TWIX Services
III. Maintenance (continued)
4. Useful Tools

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TWIX provides looking-glass path verification mechanism to ease
the tasks of troubles isolation.
Functions include:
(a) show ip bgp
(b) show ip bgp summary
(c) show ip bgp dampened-paths
(d) show ip bgp flap-statistics
(e) ping
(f) trace
General Requirements for Participants
The following requirements apply to candidate who apply for
joining TWIX as a member to peering with other members :
1a. The candidate must have the type-II license, granted by
Directorate General of Telecommunications (DGT) of the Ministry of
Transportation and Communications (MOTC).
1b. For the non-profit/experimental candidate, the special-permission
paper, issued by MOTC, is required.
2.
Candidate must have legal AS number and IP prefixes assigned
directly from the NIC.
3.
When TWIX has scaled to multiple locations, candidate apply for
multi-homed interconnection to TWIX should never detour the intraAS traffics via TWIX.
Installation Procedures
After candidate’s request is admitted, the following technical
requirements must be met to fulfill the installation procedures:
1.
Peering members can apply for DS1, DS3, STM-1 or STM-4 leased
line connecting to members’ border router in TWIX.
2.
TWIX provides the access port on Ethernet Switch, from which
connecting to members’ border routers.
3.
The access speed can be 10 Mbps, 100 Mbps, 1/3 Gigabit-ethernet
(333 Mbps) or full GE speed.
4.
The routing protocol must comply to BGP version-4 (RFC-1771), in
together with the basic functions/features.
TWIX Access Stats
Most Participants apply DS3 circuits (or above) to
TWIX, up to 88%.
The Number of Circuits Terminated: 66
•
STM-4 : 1
•
STM-1 : 20
•
DS3 : 37
•
DS1 : 8
T1
12%
T3
56%
STM-4
2%
STM-1
30%
TWIX Members
38 participants till Aug, 2002
HiNet(3462)
TWNAP(7655)
GCNet(4662)
PCSNet(17422)
Gamania(7532)
AsiaInfra(17502)
TTN(7541)
TFN(9924)
ERANet(9310)
ETWEBS(9415)
SYSNet(4783)
SeederNet(7538)
GigaMedia(9416)
Dwins(17416)
EPOWER(18109)
SeedNet(4780)
TradeVAN(9671)
PAGICNet(4781)
ISLNet(7649)
InfoServe(9739)
FETnet(9674)
APOL(7482)
TISNet(7535)
AGC(3549)
Unigate(9831)
CNLINK(7540)
AT&T(2687)
Symphox(9216)
KGEx(9918)
NCIC(9919)
TATNET(17418)
AboveNet(10133)
GSN(4782)
TANet(1659)
Intergrand(9917)
DYXNet(9244)
SINGTEL(4845)
KBT (18042)
TWIX Traffics
• Before 26 August, 2002
• Max/Avg Volumn : 1.4/1.1 Gbps
• This stats account for the aggregated inbound and outbound traffic volumns.
Current IX Issues
The maintenance of colocated border router when
external leased circuits failed.
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The incongruent requirements/policies regarding to
extended BGP attributes among members.
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The coordination of bandwidth increasing demands
from members to members.
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The policies of flapped routes.
TWIX Futures
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Provides 10 Gbit access for future growth.
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Scaled to multiple IX locations.
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Provides out-of-band management facilities.
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Promoting the regional IXP (IX Provider)
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IPv6 IX trial and commercial services.
The re-examine of IX members’ qualification to
explore more aggressive business models.
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