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117386-A Rev. A 2-1
Chapter 2
Implementation Notes
This chapter describes special issues that you may encounter in configuring and
running encryption.
Requirements for Enabling Encryption
To configure encryption, you must configure WEP parameters and either Frame
Relay or PPP encryption parameters. You must enable encryption for both the line
and circuit WEP parameters, and for either Frame Relay or PPP.
If you enable encryption for the line and circuit, but not for a protocol, data does
not travel over the network.
If you enable encryption for the line, circuit, and protocol, and some other
attribute for encryption is misconfigured, WEP drops data rather than sending it
unencrypted.
Selecting Encryption Strength
Both sides of a link must use the same encryption strength. Note that you can
select both encryption strengths, enabling a router that has 56-bit encryption
strength to use 40-bit encryption with a router that has only 40-bit encryption.
- Configuring Data 1
- Encryption Services 1
- Contents 5
- About This Guide 11
- Conventions 12
- Acronyms 13
- How to Get Help 14
- Chapter 1 17
- Data Encryption Overview 17
- 117386-A Rev. A 18
- Security and Data Encryption 19
- Encryption Keys 20
- Node Protection Key (NPK) 22
- Master Encryption Key (MEK) 24
- Traffic Encryption Key (TEK) 24
- Chapter 2 25
- Implementation Notes 25
- Synchronizing Router Clocks 26
- Encryption and Performance 26
- Using an NPK 27
- Chapter 3 29
- Enabling Encryption 29
- Starting Encryption 30
- Creating Seeds 30
- Creating Seeds on a PC 31
- 117386-A Rev. A 3-5 33
- Creating NPKs and LTSSs 35
- Creating LTSSs 36
- Entering an NPK on a Router 37
- Changing NPKs 38
- Monitoring NPKs 38
- Changing LTSSs 39
- Creating TEKs 39
- Starting Encryption for PPP 41
- 3-14 117386-A Rev. A 42
- 3. Enter the NPK 42
- 117386-A Rev. A 3-15 43
- 3-16 117386-A Rev. A 44
- 2. Select the WEP protocol 44
- Configuring WEP Parameters 46
- Disabling Encryption 47
- 3-20 117386-A Rev. A 48
- 2. Click on OK 48
- Appendix A 49
- Encryption Parameters 49
- 50
- WEP Line Parameters 52
- A-6 117386-A Rev. A 54
- Appendix B 57
- Definitions of k Commands 57
- 117386-A Rev. A Index-1 59
- 117386-A Rev. A Index-3 61
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