Juniper JUNOS 10.1 - CONFIGURATION GUIDE 1-2010 Configuration Manual page 189

encapsulation (atm-ccc-cell-relay | atm-pvc | cisco-hdlc | cisco-hdlc-ccc | cisco-hdlc-tcc
| ethernet-ccc | ethernet-over-atm | ethernet-tcc | ethernet-vpls |
extended-frame-relay-ccc | extended-frame-relay-ether-type-tcc |
extended-frame-relay-tcc | extended-vlan-ccc | extended-vlan-tcc | extended-vlan-vpls
| flexible-ethernet-services | flexible-frame-relay | frame-relay | frame-relay-ccc |
frame-relay-ether-type | frame-relay-ether-type-tcc | frame-relay-port-ccc | frame-relay-tcc
| multilink-frame-relay-uni-nni | ppp | ppp-ccc | ppp-tcc | vlan-ccc | vlan-vpls);
The physical interface encapsulation can be one of the following:
ATM CCC cell relay—Connects two remote virtual circuits or ATM physical
interfaces with a label-switched path (LSP). Traffic on the circuit is ATM cells.
You can configure an ATM1 Physical Interface Card (PIC) to use cell-relay
accumulation mode (CAM). In this mode, the incoming cells (1 to 8 cells) are
packaged into a single packet and forwarded to the LSP. Cell-relay accumulation
mode is not supported on ATM2 PICs. You configure CAM as shown in the
following example:
[edit chassis]
fpc 1 {
pic 0 {
atm-cell-relay-accumulation;
}
}
For more information, see the JUNOS System Basics Configuration Guide.
ATM PVC—Defined in RFC 2684, Multiprotocol Encapsulation over ATM Adaptation
Layer 5. When you configure physical ATM interfaces with ATM PVC
encapsulation, an RFC 2684-compliant ATM Adaptation Layer 5 (AAL5) tunnel
is set up to route the ATM cells over a Multiprotocol Label Switching (MPLS) path
that is typically established between two MPLS-capable routers using the Label
Distribution Protocol (LDP).
Cisco HDLC—E1, E3, SONET/SDH, T1, and T3 interfaces can use Cisco HDLC
encapsulation. Two related versions are supported:
CCC version (
cisco-hdlc-ccc
encapsulation statement. When you use this encapsulation type, you can
configure the ccc
TCC version (
cisco-hdlc-tcc
restrictions, but used for circuits with different media on either side of the
connection.
Ethernet over ATM—As defined in RFC 1483, Multiprotocol Encapsulation over
ATM Adaptation Layer 5, this encapsulation type allows ATM interfaces to connect
to devices that support only bridged-mode protocol data units (BPDUs). The
JUNOS Software does not completely support bridging, but accepts BPDU packets
as a default gateway. If you use the router as an edge device, then the router
acts as a default gateway. It accepts Ethernet logical link control (LLC)/SNAP
frames with IP or Address Resolution Protocol (ARP) in the payload, and drops
the rest. For packets destined to the Ethernet local area network (LAN), a route
lookup is done using the destination IP address. If the route lookup yields a full
Chapter 3: Configuring Physical Interface Properties
)—The logical interface does not require an
family only.
)—Similar to CCC and has the same configuration
Configuring Interface Encapsulation on Physical Interfaces
119