Juniper JUNOS 10.1 - CONFIGURATION GUIDE 1-2010 Configuration Manual page 381

Configuring Layer 2
Circuit Cell-Relay
Transport Mode
In Figure 19 on page 312, Router A is a local PE router. Router B is a remote PE router.
Configuring Layer 2
Both Juniper Networks routers have Layer 2 circuit cell-relay capability. You configure
Circuit Trunk Transport
an ATM physical interface on Router A in Layer 2 circuit trunk mode and specify
Mode
trunks that are allowed to send traffic over the LSP. As a cell is received on this
interface, it is classified using the CoS bits in the cell header, and encapsulated as a
labeled packet. It is then queued on one of the outgoing queues according to its
classification and sent over the LSP to Router B. At Router B, the packet label is
removed and the raw cell is put on one of the queues of the ATM interface and
forwarded to the second ATM switch. To carry the CoS information and CLP of the
cell over the network, the CoS and CLP bits are copied into the EXP bits of the MPLS
label. This CoS information is used to select the output queues. Using EPD profiles,
the CLP is used to determine whether the cell should be dropped.
For more information about ATM CoS capability, see "Configuring ATM2 IQ VC Tunnel
CoS Components" on page 347.
}
[edit interfaces]
at-0/1/0 {
atm-options {
pic-type atm2;
vpi 0;
}
unit 0 {
encapsulation atm-ccc-vc-mux;
point-to-point;
vci 0.32;
}
}
[edit chassis]
fpc 0 {
pic 1 {
atm-l2circuit-mode cell;
}
}
[edit interfaces]
at-0/1/0 {
encapsulation atm-ccc-cell-relay;
atm-options {
pic-type atm2;
vpi 0;
}
unit 0 {
encapsulation atm-ccc-cell-relay;
point-to-point;
vci 0.32;
}
}
Chapter 13: Configuring ATM Interfaces
Configuring Layer 2 Circuit Transport Mode
311