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Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
Chapter
OL-23826-03 May 2012 • Structure-Agnostic TDM over Packet (SAToP) is a
structure-agnostic protocol for transporting TDM using
pseudowires (PW). PW connections using SAToP are
supported.
• SAToP pseudowire with UDP encapsulation is supported.
• CESoPSN pseudowire with UDP encapsulation is supported.
• QoS for CESoPSN over UDP and SAToP over UDP—IP
DSCP and IP Precedence via service-policy, and Type of
Service (ToS) settings are supported in pseudowire class.
• L2VPN Pseudowire Redundancy feature:
–
provides backup service for circuit emulation (CEM)
pseudowires.
–
enables the network to detect failure, and reroute the
Layer 2 (L2) service to another endpoint that can
continue to provide the service.
–
provides the ability to recover from a failure: either the
failure of the remote PE router, or of the link between
the PE and the CE routers.
• T1 Local Switching—This feature allows switching of Layer
2 data between two CEM interfaces on the same router.
• IEEE 1588-2008 (PTPv2) Ordinary Clock (OC) Master
Clock mode is supported.
• G.781 QL-enabled mode is supported for synchronization
clock selection to avoid timing loops in the network.
• ESMC—This feature dynamically distributes clock-quality
across synchronous ethernet links and enables selection of
the best clock in the network.
• Onboard Failure Logging (OBFL)—OBFL provides a
mechanism to store hardware, software, and environment
related critical data in a non-volatile memory, such as flash
EPROM or EEPROM on routers. Stored OBFL data can be
retrieved in the event of a crash or failure.
• MAC Flap control—A MAC flap occurs when a switch
receives packets from two different interfaces, with the same
source MAC address. When a MAC flap occurs, Cisco ASR
901 does Err-Disabling in one of the ports that has flapping.
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