Increased per-VC bandwidth speed

You can configure constant bit rate (CBR) bandwith speeds up to 622 Mbps (OC12) per virtual circuit (VC) on an MX Series router with an ATM MIC with SFP (model number MIC-3D-8OC3-2OC12-ATM) and a supported MPC installed. In earlier Junos OS releases, you could configure per-VC CBR bandwidth speeds only up to 155 Mbps (OC3) on an ATM MIC with SFP.

With the increased per-VC CBR bandwidth speed, each VC can support up to line rate traffic in OC12 mode, subject to the following restrictions:

• You must configure the CBR service category when you define the ATM traffic shaping and scheduling profile.

For other ATM service categories including variable bit rate nonreal time (VBR-NRT), variable bit rate real time (VBR-RT), and unspecified bit rate (UBR), the per-VC bandwidth speed for an ATM MIC with SFP remains a maximum of 155 Mbps.

• The actual Layer 3 payload throughput you obtain depends on the ATM encapsulation type and IP packet size you use.