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JUNOS 10.1 Network Interfaces Configuration Guide
Configuring Frame Relay Interface Encapsulation
Point-to-Point Protocol (PPP) encapsulation is the default encapsulation type for
physical interfaces. You need not configure encapsulation for any physical interfaces
that support PPP encapsulation. If you do not configure encapsulation, PPP is used
by default. For physical interfaces that do not support PPP encapsulation, you must
configure an encapsulation to use for packets transmitted on the interface. You can
optionally configure an encapsulation on a logical interface, which is the encapsulation
used within certain packet types.
For more information, see the following sections:
Configuring the Frame Relay Encapsulation on a Physical Interface
For Frame Relay interfaces, configure Frame Relay encapsulation on the physical
interface. This encapsulation is defined in RFC 1490, Multiprotocol Interconnect over
Frame Relay. SONET/SDH and T3 interfaces can use Frame Relay encapsulation.
To configure Frame Relay encapsulation on a physical interface, include the
encapsulation
When you configure a multipoint encapsulation (such as Frame Relay), the physical
interface can have multiple logical units, and the units can be either point-to-point
or multipoint.
The encapsulation type can be one of the following:
380
Configuring Frame Relay Interface Encapsulation
Configuring the Frame Relay Encapsulation on a Physical Interface on page 380
Configuring the Frame Relay Encapsulation on a Logical Interface on page 383
statement at the
[edit interfaces interface-name]
encapsulation type;
Flexible Frame Relay (
flexible-frame-relay
Relay encapsulation. You use flexible Frame Relay encapsulation when you want
to configure multiple per-unit Frame Relay encapsulations. This encapsulation
type allows you to configure any combination of TCC, CCC, and standard Frame
Relay encapsulations on a single physical port. Also, each logical interface can
have any DLCI value from 1 through 1022.
Frame Relay (
frame-relay
SONET/SDH, T1, T3, and voice services interfaces can use Frame Relay
encapsulation. Five related versions are supported:
Circuit cross-connect (CCC) version (
Frame Relay for DLCIs 0 through 511. DLCIs 512 through 1022 are dedicated
to CCC. The logical interface must also have
When you use this encapsulation type, you can configure the
Translational cross-connect (TCC) version (
Relay CCC and has the same configuration restrictions, but used for circuits
with different media on either side of the connection.
[edit interfaces interface-name]
)—IQ interfaces can use flexible Frame
)—Defined in RFC 1490. E1, E3, link services,
frame-relay-ccc
frame-relay-ccc
frame-relay-tcc
hierarchy level:
)—The same as standard
encapsulation.
family only.
ccc
)—Similar to Frame
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