the physical interface, VLAN IDs from 1 through 511 are no longer reserved for normal
VLANs.
•
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.
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.
In ACX Series routers, VPLS is supported only on ACX5048 and ACX5096
routers.
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 unit statement) associated with it. 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.
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:
•
VLAN ID 0 is reserved for tagging the priority of frames.
•
For encapsulation type vlan-ccc, VLAN IDs 1 through 511 are reserved for normal VLANs.
VLAN IDs 512 and above are reserved for VLAN CCCs.
When you configure Ethernet virtual LAN (VLAN) encapsulation on CCC circuits (by
using the encapsulation vlan-ccc statement at the [edit interfaces interface-name]
hierarchy level), you can bind a list of VLAN IDs to the interface by using the vlan-id-list
[ vlan-id-numbers ] statement to configure a CCC for multiple VLANs. Configuring this
statement creates a CCC for:
•
Each VLAN listed—for example, vlan-id-list [ 100 200 300 ]
•
Each VLAN in a range—for example, vlan-id-list [ 100-200 ]
•
Each VLAN in a list and range combination—for example, vlan-id-list [ 50, 100-200,
300 ]
•
For encapsulation type vlan-vpls, VLAN IDs 1 through 511 are reserved for normal 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),
Copyright © 2017, Juniper Networks, Inc.504
ACX Series Universal Access Router Configuration Guide
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