Cisco Asr 1000 Series Aggregation Services Routers Sip And Spa Software Configuration Guide, Cisco Ios - Cisco ASR 1000 Series Software Configuration Manual

Overview of the Ethernet SPAs
• Full-duplex operation
• 802.1Q VLAN termination
• Jumbo frames support (9216 bytes)
• Support for command-line interface (CLI)-controlled OIR
• 802.3x flow control
• The following maximum number of VLANs per SPA:
• Up to 5000 MAC Accounting Entries per SPA (Source MAC Accounting on the ingress and Destination
MAC Accounting on the egress)
• Per-port byte and packet counters for policy drops, oversubscription drops, CRC error drops, packet
sizes, unicast, multicast, and broadcast packets
• Per-VLAN byte and packet counters for policy drops, oversubscription drops, unicast, multicast, and
broadcast packets
• Per-port byte counters for good bytes and dropped bytes
• Multiprotocol Label Switching (MPLS)
• Quality of Service (QoS)
• Hot Standby Router Protocol (HSRP)
Following are the additional features supported by the 2-Port Gigabit Synchronous Ethernet SPA on the Cisco
ASR 1000 Series Routers:
• L1 clock frequency distribution—In this mode, the 2-Port Gigabit Synchronous Ethernet SPA recovers
the received clock, synchronizes it to a traceable source, and uses it to transmit data to the next node.
• A Building Integrated Time Source (BITS) interface for an external Synchronization Supply Unit (SSU)
or a BITS device can be used as a clock source, or to clean up the accumulated wander on either a system
or a recovered clock.
• The GPS timing interface is used for external GPS devices, and can be selected as either an input or an
output reference. The GPS timing interface supports connectivity to the GPS clock.
• In order to maintain a communication channel in synchronous network connections, Ethernet relies on
a channel called Ethernet Synchronization Messaging Channel (ESMC) based on the IEEE 802.3
Organization-Specific Slow Protocol. ESMC relays the SSM code that represents the quality level of
the Ethernet Equipment Clock (EEC) in a physical layer.
•
OL-14127-17
◦Up to 8100 VLANs per SPA—For all Ethernet SPAs supported on the Cisco ASR 1000 Series
Aggregation Services Routers in software releases prior to Cisco IOS XE Release 2.5.
◦Up to 4094 VLANs per port per SPA—For all Ethernet SPAs supported on the Cisco ASR 1000
Series Aggregation Services Routers beginning in Cisco IOS XE Release 2.5 using the hw-module
subslot ethernet vlan unlimited command.
Cisco ASR 1000 Series Aggregation Services Routers SIP and SPA Software Configuration Guide, Cisco IOS XE
Supported Features
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