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ATM Adaptation Layer

The ATM Adaptation Layer (AAL) defines the conversion of user information into cells by segmenting upper-layer information into cells at the transmitter and reassembling them at the receiver. AAL1 and AAL2 handle intermittent traffic, such as voice and video, and are not relevant to the router. AAL3/4 and AAL5 support data communications by segmenting and reassembling packets.

E-series routers support the following AAL5 encapsulation types as specified in RFC 2684—Multiprotocol Encapsulation over ATM Adaptation Layer 5 (September 1999), which replaces RFC 1483:

aal5snap—LLC/SNAP
aal5mux ip—VC-based multiplexing
aal5autoconfig—LLC/SNAP or VC-based multiplexing. (See Configuring Dynamic Interfaces.)
aal5all—Martini encapsulation

Note: The E120 router and the E320 router do not support Martini encapsulation (aal5all) in the current release.

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