Vodafone Egypt 2G Cutover_2

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Vodafone Egypt 2G Cutover

BEP1.0

Top right corner for field-mark, customer or partner logotypes. See Best practice for example.

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Text 24 pt

Bullets level 2-520 pt

Ericsson Internal Vodafone Egypt 2G Cutover 2009-10-192

2G Cutover Scenario

Aims– Transport 2G traffic over 8600’s (El Haram - 3rd District) – Protect the traffic going over the redundant links

Agenda– Issues affecting the cutover– Proposed Solutions– Conclusion (Agree a new cutover date and ways forward)


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2G Cutover Scenario

LSP 1+1 over two hops

Elharam1201

3rd District8102

3rd District8101

STM-1 over microwave #1


GE Link (ELP - worker)

GE Link (ELP - protection)

Working Tunnel over two hops strict hopSTM1#1 and GE

Protection Tunnel over two hops strict hopSTM1#2 and GE

8/0/0

7/0/0

13/0/0

2/0/0

8/1/1

7/1/1

8/1/1

7/1/1

BTS BSC


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Cutover Issues

Deviation from HLD/LLD/Pilot Test Cases/Workorder– New Requirement for long term troubleshooting– Differences in Connectivity/Topology– Differences in Protection Scheme

Slow DCN to El Haram– Third party recommendations for the Management System

Flapping Third Party Microwave


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Possible Solutions #1

LSP 1+1 over two hops without ELP

Elharam1201

3rd District8102

3rd District8101



GE Link #1

GE Link #2

Working Tunnel over two hops strict hopSTM1#1 and GE Link #1

Protection Tunnel over two hops strict hopSTM1#2 and GE Link #2

8/0/0

7/0/0

13/0/0

2/0/0

8/1/1

7/1/1

8/1/1

7/1/1

BTS BSC


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2 Hop Tunnel without ELP– Explanation

2 Tunnels configured as LSP 1+1 over the two hops with working tunnel going over Microwave link #1 and GE link #1 and protection tunnel going over Microwave link #2 and GE link #2

– Advantages Can check which tunnel the PWE is taking in the

‘check operation status’ option in VPN provisioning Faster switching times

– Disadvantages ELP not configured on the GE links


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Possible Solution #2

Elharam1201

3rd District8102

3rd District8101



GE (ELP – Worker0

GE (ELP – Protection)

Tunnel over two hops Primary path – STM-1 #1 and GE link - Worker

Secondary path - STM-1 #2 and GE link - Worker

8/0/0

7/0/0

13/0/0

2/0/0

8/1/1

7/1/1

8/1/1

7/1/1

BTS BSC

RSVP1:1 over two hops with ELP


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RSVP 1:1 with ELP– Explanation

Tunnel configured over the two hops with primary path as the working path (i.e. Microwave link #1 and worker - GE link) and secondary path as the protection path (i.e. Microwave link #2 and worker GE link)

– Advantages ELP configuration on the GE link between 8101 and

8102 remains– Disadvantages

RSVP switching times slow compared to LSP1+1


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Conclusion

Decide on the best possible solution for the cutover. Extensively test and verify the solution on site, using

Analyser/Test BTS (24hrs Stability Test) Execute the cutover Update the Design document with all the information

retrieved from the pilot testing and the first cutover. 3G Traffic scenario will be influenced by the proposed

solutions. Design will need to be updated and verified in pilot test.


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Vodafone Egypt 2G Cutover_2

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