Avaya Configuring Data Encryption Services User Manual download pdf (Page 27)

Implementation Notes

117386-A Rev. A 2-3

Using Data Compression with Encryption

You can conﬁgure both hardware- and software-based data compression over

Frame Relay and PPP networks running encryption.

Enabling compression improves bandwidth efﬁciency by eliminating redundant

strings in data streams. This, in turn, improves network response times and

reduces line costs. Hardware compression is particularly effective in improving a

router’s throughput when you use encryption.

When you use encryption with compression, the software compresses the data

before it encrypts it.

To use data compression, refer to Conﬁguring Data Compression Services.

Using an NPK

Your conﬁguration ﬁle includes a ﬁngerprint of the NPK. The NPK in the MIB

must match the NPK in the router’s nonvolatile memory, or encryption cannot

occur. This means that if you want to change anything in your encryption

conﬁguration after you have exited from the original conﬁguration session, you

must reenter the NPK exactly as you entered it initially.

If you install a new CPU board on a router, or swap boards between routers, you

must reenter the NPK on the affected routers.

The NPK remains on a board that you remove from a router using data encryption.

For security reasons, you need to plan ahead to make sure that an NPK you are

using resides only on a router that carries encrypted trafﬁc.

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Avaya Configuring Data Encryption Services User Manual Page 27