ATM Support on Circuit Emulation PICs Overview
The following components support ATM over MPLS (RFC 4717) and packet encapsulations (RFC 2684):
4-port COC3/CSTM1 Circuit Emulation PIC on M7i and M10i routers.
12-port T1/E1 Circuit Emulation PIC on M7i and M10i routers.
Channelized OC3/STM1 (Multi-Rate) Circuit Emulation MIC with SFP (MIC-3D-4COC3-1COC12-CE) on MX Series routers.
16-Port Channelized E1/T1 Circuit Emulation MIC (MIC-3D-16CHE1-T1-CE) on MX Series routers.
Circuit Emulation PIC ATM configuration and behavior is consistent with existing ATM2 PICs.
Circuit Emulation PICs require firmware version rom-ce-9.3.pbin or rom-ce-10.0.pbin for ATM IMA functionality on M7i, M10i, M40e, M120, and M320 routers running JUNOS OS Release 10.0R1 or later.
ATM OAM Support
ATM OAM supports:
Generation and monitoring of F4 and F5 OAM cells types:
F4 AIS (end-to-end)
F4 RDI (end-to-end)
F4 loopback (end-to-end)
Generation and monitoring of end-to-end cells of type AIS and RDI
Monitor and terminate loopback cells
OAM on each VP and VC simultaneously
VP Pseudowires (CCC Encapsulation)—In the case of ATM virtual path (VP) pseudowires—all virtual circuits (VCs) in a VP are transported over a single N-to-one mode pseudowire—all F4 and F5 OAM cells are forwarded through the pseudowire.
Port Pseudowires (CCC Encapsulation)—Like VP pseudowires, with port pseudowires, all F4 and F5 OAM cells are forwarded through the pseudowire.
VC Pseudowires (CCC Encapsulation)—In the case of VC pseudowires, F5 OAM cells are forwarded through the pseudowire, while F4 OAM cells are terminated at the Routing Engine.
Protocol and Encapsulation Support
The following protocols are supported:
QoS or CoS queues. All virtual circuit (VCs) are unspecified bit rate (UBR).
This protocol is not supported on M7i and M10i routers.
ATM over MPLS (RFC 4717)
ATM via dynamic labels (LDP, RSVP-TE)
NxDS0 grooming is not supported
The following ATM2 encapsulations are not supported:
atm-cisco-nlpid—Cisco-compatible ATM NLPID encapsulation
atm-mlppp-llc—ATM MLPPP over AAL5/LLC
atm-nlpid—ATM NLPID encapsulation
atm-ppp-llc—ATM PPP over AAL5/LLC
atm-ppp-vc-mux—ATM PPP over raw AAL5
atm-snap—ATM LLC/SNAP encapsulation
atm-tcc-snap—ATM LLC/SNAP for translational cross-connect
atm-tcc-vc-mux—ATM VC for translational cross-connect
vlan-vci-ccc—CCC for VLAN Q-in-Q and ATM VPI/VCI interworking
atm-vc-mux—ATM VC multiplexing
ether-over-atm-llc—Ethernet over ATM (LLC/SNAP) encapsulation
ether-vpls-over-atm-llc—Ethernet VPLS over ATM (bridging) encapsulation
Table 1 lists the maximum number of virtual circuits (VCs) that are supported on various components on the M10i router, on the M7i router, and on MX Series routers.
Table 1: Maximum Number of VCs
Maximum Number of VCs
12-port Channelized T1/E1 Circuit Emulation PIC
4-port Channelized COC3/STM1 Circuit Emulation PIC
Channelized OC3/STM1 (Multi-Rate) Circuit Emulation MIC with SFP
16-Port Channelized E1/T1 Circuit Emulation MIC
Limitations to ATM Support on Circuit Emulation PICs
The following limitations apply to ATM support on Circuit Emulation PICs:
Packet MTU—Packet MTU is limited to 2048 bytes.
Trunk mode ATM pseudowires—Circuit Emulation PICs do not support trunk mode ATM pseudowires.
OAM-FM segment—Segment F4 flows are not supported. Only end-to-end F4 flows are supported.
IP and Ethernet encapsulations—IP and Ethernet encapsulations are not supported.
F5 OAM—OAM termination is not supported.