Juniper JUNOS 10.1 - CONFIGURATION GUIDE 1-2010 Configuration Manual page 366

JUNOS 10.1 Network Interfaces Configuration Guide
Table 25: ATM1 and ATM2 IQ Supported Features (continued)
Item
Layer 2 circuit cell-relay, Layer 2
circuit AAL5, and Layer 2 circuit
trunk transport modes: Allow you to
send ATM cells or AAL5 PDUs
between ATM2 IQ interfaces across
a Layer 2 circuit-enabled network.
Layer 2 circuits are designed to
transport Layer 2 frames between
provider edge (PE) routers across a
Label Distribution Protocol
(LDP)-signaled Multiprotocol Label
Switching (MPLS) backbone.
Layer 2 VPN cell relay and Layer 2
VPN AAL5: Allow you to carry ATM
cells or AAL5 PDUs over an MPLS
backbone.
Point-to-Point Protocol (PPP) over
ATM encapsulation: Associates a PPP
link with an ATM AAL5 PVC.
Other ATM Attributes
EPD (early packet discard) threshold:
Limits the queue size in ATM cells of
a particular VC or forwarding class
configured over a VC when using VC
tunnel class of service (CoS). When
the first ATM cell of a new packet is
received, the VC s queue depth is
checked against the EPD threshold.
If the VC s queue depth exceeds the
EPD threshold, the first and all
subsequent ATM cells in the packet
are discarded.
OAM F4 cell flows: Identify and
report virtual path connection (VPC)
defects and failures.
296
Supported Features on ATM1 and ATM2 IQ Interfaces
ATM1 ATM2 IQ Comments
Not Supported Transport mode is per PIC, not per port. If you configure
supported Layer 2 circuit cell-relay, Layer 2 circuit AAL5, or Layer 2
circuit trunk transport mode, the entire ATM2 IQ PIC uses
the configured transport mode.
Layer 2 circuit cell-relay mode supports both VP- and
port-promiscuous modes.
See "Configuring Layer 2 Circuit Transport Mode" on page 308.
Supported Supported See the JUNOS VPNs Configuration Guide.
Not Supported For ATM2 IQ interfaces, the JUNOS Software supports three
supported PPP over ATM encapsulation types:
Not Supported If you are using VC tunnel CoS, the EPD threshold configured
supported at the logical unit level has no effect. You should configure
each forwarding class for congestion management using
either an individual EPD threshold (in other words, tail drop)
or weighted random early detection (WRED) profile.
See "Configuring the ATM2 IQ EPD Threshold" on page 334
and "Configuring ATM2 IQ VC Tunnel CoS Components" on
page 347.
Not Supported See "Configuring the OAM F4 Cell Flows" on page 322.
supported
atm-ppp-llc —PPP over AAL5 logical link control (LLC).
atm-ppp-vc-mux —PPP over AAL5 multiplex.
atm-mlppp-llc —Multilink PPP over AAL5 LLC. Requires a
Link Services or Voice Services PIC.
See "Configuring PPP over ATM2 Encapsulation" on
page 342.