Information About AAL5 L3 Termination
When ATM feature is enabled, IMs can be deployed for ATM service that delivers high-performance interconnectivity, metro, and intra-point of presence (POP) applications between service POPs for IP/Multiprotocol Label Switching (IP/MPLS) transport (Figure 1).
AAL5 L3 termination can also be deployed at customer premises equipment (CPE) to provide the data component for the service provider networks. The ATM service allows service providers to effectively manage the bandwidth at the edges of the network while implementing value-added Layer 3 service.
Restrictions for AAL5 L3 Termination
- Main interface cannot be configured as layer 3 Asynchronous Transfer Mode (ATM) interface. Therefore you cannot create layer 3 Permanent Virtual Circuits (PVC) under main interface.
- Point-to-multipoint sub-interface is not supported.
- Quadrature Amplitude Modulation (QAM) is not supported on ATM L3 Interface.
- Operations, administration, and maintenance (OAM) is not supported on ATM L3 interface.
- You cannot swap from layer 2 transport ATM to layer 3 ATM interface without deleting ATM sub-interface.
- ATM layer 3 Permanent Virtual Path (PVP) is not supported.
- Inverse Multiplexing for ATM is not supported.
- ATM adaptation layer 5 Subnetwork Access Protocol SNAP (AAL5SNAP) protocol is supported. AAL0 is not supported.
- ATM L3 QoS is not supported.
- One port of an interface
module (IM) supports only one interface configuration. For example, one OC-3
port can support one of the following configurations and not a combination of
configurations:
- CEM (CESoP or SAToP)
- ATM
- IMA
- DS3
-
Half-duplex VRF is not supported on this router.
Scale Supported for AAL5 L3 Termination
- IMs:
- A900-IMA16D: The 16 port T1/E1 card supports a maximum of 350 virtual circuits (VCs per port and on the T1/E1).
- A900-IMA40S: Only 900 VCs can be configured per OC3 IM. 500 VCs are supported in per port on the OC-3 IM.
- Up to 4000 layer 3 interfaces, including Serial interfaces, can be configured.