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100

101

Configuring IP Routers and Interfaces

2-25

BFE devices receive authorization and address translation services from an

Access Control Center residing on the Black network. The ACC makes access

control decisions that determine which hosts are allowed to communicate with

each other. A Key Distribution Center (KDC) residing on the Black network

provides encryption keys and key management services. A BFE device uses these

encryption keys for encrypting trafﬁc between itself and other BFE devices.

The router-to-BFE interface is a modiﬁed version of the interface presented in the

1983 DDN X.25 Host Interface Speciﬁcation. It supports data rates between 1200

b/s and 64 KB/s. In order to support BFE services, the interface must be

conﬁgured to support IP with the Revised IP Security Option (RIPSO) enabled.

All IP datagrams transmitted on the interface must contain a RIPSO security label.

The ﬁrst option in each IP datagram header must be the Basic Security option.

BFE Addressing

You can enable BFE support on individual IP interfaces. When you enable BFE

support, the router uses the BFE address-resolution algorithm to map IP addresses

to their corresponding X.121 addresses.

BFE IP-to-X.121 address translation differs from standard DDN address

translation. Each physical router-to-BFE connection is identiﬁed by a BFE X.121

network address and a BFE IP address. The format of a BFE X.121 address is

zzzzzpdddbbb

where:

For instructions on using Site Manager to conﬁgure support for a BFE encryption device,

see “Conﬁguring Blacker Front End Support” on page 2-89.

zzzzz

is zero

is the BCD encoding of the port ID

ddd

is the BCD encoding of the domain ID

bbb

is the BCD encoding of the BFE ID

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 465 466

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