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JUNOS 10.1 Network Interfaces Configuration Guide
NOTE: When the encapsulation type is set to Cisco-compatible Frame Relay
encapsulation, ensure that the LMI type is set to ANSI or Q933-A.
Encapsulation Capabilities
When you configure a point-to-point encapsulation (such as PPP or Cisco HDLC) on
a physical interface, the physical interface can have only one logical interface (that
is, only one
encapsulation (such as Frame Relay), the physical interface can have multiple logical
units, and the units can be either point-to-point or multipoint.
Ethernet CCC encapsulation for Ethernet interfaces with standard TPID tagging
requires that the physical interface have only a single logical interface. Ethernet
interfaces in VLAN mode can have multiple logical interfaces.
For Ethernet interfaces in VLAN mode, VLAN IDs are applicable as follows:
122
Configuring Interface Encapsulation on Physical Interfaces
Extended TCC version (
allows you to dedicate Cisco-compatible Frame Relay TCC for DLCIs 1 through
1022. This encapsulation is used for circuits with different media on either
side of the connection.
Multilink Frame Relay (MLFR) UNI and NNI (
services and voice services interfaces functioning as FRF.16 bundles can use
multilink Frame Relay UNI NNI encapsulation. This encapsulation is also used
on link services and voice services interfaces constituent T1, E1, or NxDS0
interfaces.
PPP—Defined in RFC 1661, The Point-to-Point Protocol (PPP) for the Transmission
of Multiprotocol Datagrams over Point-to-Point Links. PPP is the default
encapsulation type for physical interfaces. E1, E3, SONET/SDH, T1, and T3
interfaces can use PPP encapsulation. Two related versions are supported:
Circuit cross-connect (CCC) version (
require an encapsulation statement. When you use this encapsulation type,
you can configure the
Translational cross-connect (TCC) version (
the same configuration restrictions, but used for circuits with different media
on either side of the connection.
statement) associated with it. When you configure a multipoint
unit
VLAN ID 0 is reserved for tagging the priority of frames.
For encapsulation type
vlan-ccc
VLANs. VLAN IDs 512 and above are reserved for VLAN CCCs.
For encapsulation type
vlan-vpls
VLANs, and VLAN IDs 512 through 4094 are reserved for VPLS VLANs. For 4-port
Fast Ethernet interfaces, you can use VLAN IDs 512 through 1024 for VPLS
VLANs.
For Gigabit Ethernet interfaces and Gigabit Ethernet IQ and IQE PICs with SFPs
(except the 10-port Gigabit Ethernet PIC and the built-in Gigabit Ethernet port
on the M7i router), you can configure flexible Ethernet services encapsulation
extended-frame-relay-ether-type-tcc
multilink-frame-relay-uni-nni
ppp-ccc
)—The logical interface does not
family only.
ccc
ppp-tcc
, VLAN IDs 1 through 511 are reserved for normal
, VLAN IDs 1 through 511 are reserved for normal
)—This encapsulation
)—Link
)—Similar to CCC and has
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