Cisco ASR 1000

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Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide
OL-14127-08
Chapter 6 Overview of the ATM SPAs
Supported Features
– Error counts for B3
– Threshold crossing alarms for B3 (B3-TCA)
– Loss of pointer (PLOP)
– New pointer events (NEWPTR)
– Positive stuffing event (PSE)
– Negative stuffing event (NSE)
• The following loopback tests are supported:
– Network (line) loopback
– Internal (diagnostic) loopback
• Supported SONET/SDH synchronization:
– Local (internal) timing (for inter-router connections over dark fiber or wavelength division
multiplexing [WDM] equipment)
– Loop (line) timing (for connecting to SONET/SDH equipment)
– +/– 4.6 ppm clock accuracy over full operating temperature
Layer 2 Features
• Supports the following encapsulation types:
– AAL5SNAP (LLC/SNAP)
– AAL5MUX (VC multiplexing)
– AAL5NLPID
• Supports the following ATM traffic classes and per-VC traffic shaping modes:
– Constant bit rate (CBR) with peak rate
– Unspecified bit rate (UBR) with peak cell rate (PCR)
– Non-real-time variable bit rate (VBR-nrt)
– Variable bit rate real-time (VBR-rt)
Note ATM shaping is supported, but class queue-based shaping is not.
• ATM multipoint connections (beginning in Cisco IOS XE Release 2.5)
• ATM point-to-point connections
• Explicit Forward Congestion Indication (EFCI) bit in the ATM cell header
• AToM VP and VC Mode Cell Relay support
• RFC 2225, Classical IP and ARP over ATM (obsoletes RFC 1577)
Layer 3 Features
• ATM over MPLS (AToM) in AAL0 VC and VP mode