Transcript Re-planned PEWs

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BT Wholesale Planned Engineering Works (PEW) 90 day overview
– June to August 2011.
The information contained in this presentation is confidential information as per your terms
and conditions with BT. Please do not forward, republish or permit unauthorised access.
The content is accurate at the time of writing and is subject to change.
customer relationship managemen
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BTW 2011 Network Changes – 3 month rolling plan
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Whilst BTW has continually worked to enhance its network, we are currently
undergoing an exceptional level of change driven by four main drivers:–
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Stability – to improve the reliability of the network, BTW is targeting certain network elements with
hardware and software improvements.
Capacity – the need for additional capacity is driven by an increase in the number of broadband users on
the 21C network (through migration from 20C and growth) and also by the ever-increasing bandwidth
demands of those users.
Resilience –to improve the resilience of the network , BTW is actively removing single points of failure from
the network
New Functionality – to meet the needs of the market BTW needs to enhance its network to deliver the
services its customers require. There is a current focus on efficient content delivery that will be offered
through the Wholesale Content Connect product.
This presentation outlines the key upgrade programmes, their drivers, customer impact
and the number of upgrades per programme per week.
BTW is keen to deliver all the required improvements as quickly as possible whilst
actively managing the risk to customers. For this reason a range of run-rates against
each programme has been outlined. The actual run-rates achieved will be determined
by this ongoing live analysis of risk.
Customer outage times for the PEWs start between 00:01 and 02:00 with the aim of
completing customer impacting work by 04:00. This allows 2 hours for roll-back should
the PEW be unsuccessful.
Business as usual capacity upgrades and upgrades to resilient structures have not been
listed here. All the activities outlined on slides 2, 3 and 4 involve an end user outage.
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Stability
0/117
20C BRAS
14 Code
Upgrade
Av. End
user
outage
(Mins)
Upgrades
per week
Av 10500
Min 3000
Max 18000
1-3
IPSC
120
18– 48
Av 11000
Min 3000
Max 18000
1-8
IPSC
45
2-5
Progress
Aug 11
Pt1 - 194/194
Pt2 - 194/194
Affected
Products
May 11
Functionality
/ Stability
Upgrad
es per
PEW
Planned End
20C BRAS
Code &
Card
EUs per
upgrade
August
Upgrades
Complete /
Total
July
Key Drivers
June
1
Upgrade
May
Prog No:
20C Upgrades
Key:Outage is defined as full loss of service
Planned month for upgrades
Contingency month for upgrades – 20% likelihood
Contingency month for upgrades – 50% likelihood
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See diagram on slides 8&9 for network location
High Impact Programme
Programme Complete
3
20C
upg
Jun
wh
(co
cod
doe
issu
new
cur
to i
- CO
20C
intr
imp
BRA
21C Upgrades
Capacity
8
7750 Code
Upgrade
[EES, EEA
& IEA ]
15 / 15
Av 20000
1
WBMC (host
link)
180
0-1
1100 / 1100
BAU Ongoing*
Av 800
Min 0
Max 1000
1–5
WBC
35
24-48
Av 50000
Min 1000 Max
132000
1
WBMC
(host link)
60
1-2
BB EU’s
Av 20000
Max 120000
Ethernet:
Av 60 Ccts
Max 990 Ccts
1
10 / 14
1230/1231
(99%)
WBC
MEAS
ETHERNET
24-48
5
21C B
upgra
capac
functi
and st
Provid
these
capac
Share
SVLA
offlo
Broa
to an
allev
(com
FER
sepa
impr
WBM
60 - 100
June 11
Resilience,
Capacity
100
Aug 11
7
FER
MCLAG &
Virtual
Switch
1
Ongoing
Capacity,
Stability
Av 17000
Min 0
Max 32000
Progress
June 11
SVLAN
moves
WBC
Av. End Upgrades
user
per week
outage
(Mins)
August
6
Capacity
Provider
Edge switch
Separation
Upgrades Affected
per PEW Products
July
5
Stability, Capacity, 127/151
21C BRAS
code & card Functionality
upgrade
EUs per
upgrade
June
3
Upgrades
Complete /
Total
May
Prog No:
Key Drivers
Planned End
Upgrade
4
7750
serv
diffe
This
the c
(allo
used
Conn
21C Upgrades
Copper
MSAN
Stability
20/78
Code Update
Progr No:
10
1
WBC
Av 600
Min 0
Max 1000
1
WBC
3
7-44
Part 1
12/27 (No
Customer
impact)
Part 2
2/81
Av 20000
Min 0
Max 100000
1
WBMC
180
(240 Max)
1-4
717/ 730
Ethernet
Av 7 Ccts
Max 60 Ccts
0/476
1
ETHERNET
(Copper
Access
Only)
15
(30 max)
None
0
4 - 12
80-100
Copp
upda
MPL
requ
soon
EFM
upgr
serv
15-80
Sept 11
NonCustomer
Impacting
1
1
Acce
poin
(mos
aggr
and
over
Jun 11
Stability
Av 2500
Min 0
Max 8000
Progress
Mar 12
7750 Minor
Code
13 Upgrade
Upgrades
per week
Jun 11
219/ 580
Av. End
user
outage
(Mins)
Dec 11
Resilience
Functionality
Affected
Products
Planned End
Access
MCLAG
EFM Code
12 Upgrade
Upgrade
s per
PEW
August
9
MPLS Core
Router
11 Upgrades
BB EUs
and/or
Ethernet
Circuits per
upgrade
July
Upgrades
Complete
/ Total
June
Key Drivers
May
Upgrade
5
7750
Requ
stab
Re-planned PEWs
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The level of network change that BTW is driving through inevitably leads to a need
to re-plan a number of PEWs.
The reasons for these re-plans include:- unforeseen technical issues specific to (or
indirectly impacting) that programme, re-prioritisation of work, insufficient time to
complete all work on the night and operational decisions.
BTW have made some improvements to the management of re-planned PEWs and
where possible will seek to avoid using Emergency PEWs for this re-planned work.
In some cases re-planned work will need to be carried out with less notice.
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Re-planned PEWs
Specific Programmes with high proportion of replans:Programme
Reasons
20C BRAS Code & Card
upgrades
1.
2.
Unforeseen technical issue impacting operational mgmt of some BRAS
Delayed fix meant re-planned PEWs had to be moved again
FER MCLAG upgrades
1.
Prioritisation (before Xmas) decision to re-allocate resource to BRAS
MCLAG programme
Process issues have led to abort decisions on the night before service
impacted. This is under review & some shorter-notice PEWs (~ 1week)
may be required to avoid capacity issues
2.
7750 Code upgrades
1.
2.
Productivity issues (now resolved) meant high proportion not upgraded
on the night
Additional checks were requested from the vendor to provide better
control on the night for the most heavily loaded 7750s. This meant that
some of the PEWs were replanned. These are now being carried out.
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Broadband Services on 21CN
2
1
11
9
10
8
13
8
3 4
8 13
6
8 13
5
11
7
8
Ethernet Service on 21CN
8 13
EEA/EES
EEA/EES
F
8 13
12
EFM
21CN Core
EEA/EES
F
Key
ETHC Ethernet Circuit
ETHA Ethernet Access
(Fibre/Copper)
EEA/EES
EFM
7750 Edge Router
EFM Router
Customer / CP Site
8 13
EEA/EES
8 13
Descriptions
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Colossus refers to BT's 20C UK core Internet backbone network mesh
which runs on IP technology
DSLAM - A Digital Subscriber Line Access Multiplexer (DSLAM, often
pronounced dee-slam) allows telephone lines to make faster
connections to the Internet. It is a network device, located in the
telephony exchanges of the service providers, that connects multiple
customer Digital Subscriber Lines (DSLs) to a high-speed Internet
backbone line using multiplexing techniques.
BRAS - A broadband remote access server (BRAS or BBRAS) routes
traffic to and from the digital subscriber line access multiplexers
(DSLAM) on an internet service provider's (ISP) network. The BRAS
manages the logical path from the consumers modem through to the
IP core network.
Fibre MSAN – Fibre MSAN provides both direct access for Fibre fed
customer services and aggregation/resilience protection to the
Network. MSAN is essential a next generation DSLAM. This is
essentially the edge of 21C transmission backhaul.
Copper MSAN -Copper Multi Service Access Node equipment provides
all Access for Copper/Metallic fed services, PSTN Voice DSL,
Broadband, Slow Speed Ethernet and converts the end user service to
IP.
EEA – Ethernet Edge Aggregator (a 7750)
EFM – Ethernet in the First Mile. Ethernet over copper access
IEA – Internet Edge Aggregator (a 7750)
EES – Ethernet Edge Switch (a 7750)
MSIL - Multi-service Interface Link is the Ethernet pipe connectivity
between BT’s and CPs’ 21CN networks. MSIL provides for the needs of
WBC, WBC (Converged) and NGN Call Conveyance.
BEA - Broadband Edge Aggregator.
FER – Front End Router
MSPE – Multi-service Provider Edge Takes 20C BRAS capability closer
to the end user. Less latency.
MCLAG – Multi-chassis Link Aggregation Group –
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NGA – Next generation architecture. Fibre based internet access such
as FTTC/FTTP (Fibre to the cabinet/premises)
GEA – Generic Ethernet access, allows local loop equipment (e.g.
Openreach) to be connected to fibre.
EU – End User. The consumer or business that uses the WBC
connection
Access Node – A local exchange containing one or more MSANs
Metro Node – The backhaul network from the Access Nodes
terminates on the metro nodes.
Core Node – One of 20 sites where WBC traffic is aggregated and
handed over to CPs
LPA - Logical PoP Aggregator (a router that aggregates the traffic from
BRASs at a 20C broadband point of presence)
MPLS Core- Multi-Protocol Label Switching Core network. A high speed
IP network, where packets are given a predefined route and pass
straight through, Unlike a normal IP network where each packet is
inspected and routed by each node in the network.
AP - Aggregation Point. This is where multiple end users are
aggregated into a single path for connection to the CP. Allow CPs
access to broadband end users
EP - Extension Path. This is the connection from the AP at the WBC
Interconnect Node to the CP.
Multiplexing – Many of these network elements perform the same
functions of multiplexing many transmission pathways onto a single
pathway, such that a point is reached where a single physical
connection can route connections into an ISPs network.
Alcatel 7750 Infrastructure Ethernet Aggregation Switch (IP
Multiplexor)
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Management of risk
• In addition to the standard risk mitigation that would be in place for any
network upgrade project, BT is applying additional rigour as outlined
below:– Co-ordination of PEW activities to avoid co-incident clashes with other
network and systems changes.
– Geographical rollout to focus Field Engineering resource and spares for 72
hour post-PEW support following higher-risk PEWs
– Daily calls to sanction all PEW activity for following night based on latest
available information
– Separate Go / No go calls for all key upgrades
– On-the-night efficiencies to reduce risk of failures and overruns.
– Combinations of co-incident BRAS upgrades scheduled to minimise impact on
RADIUS servers
– Additional resource being mentored to widen the skill sets and spread
available hands
– Review of previous night’s PEWs with full root-cause analysis of issues and
over-runs and mitigations put in place to minimise re-occurrences
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