Cisco Systems A9014CFD manual Xxxviii

Chapter

Document
Number	Date	Change Summary
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.

	Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
-xxxviii	OL-23826-09