Data Sheet
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802.1ag CFM:
Uses domains to contain OAM flows and bound OAM responsibilities
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802.3ah: Ethernet in the First Mile (EFM)
Three types of packets: Continuity Check, Layer 2 Ping, and Layer 2 Traceroute
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IP SLA for Ethernet
Figure 4 shows a typical small branch-office Metro Ethernet deployment.
Figure 4. Typical Metro Ethernet Deployment
High Availability
Cisco 890 Series Routers enable customers to deliver high-performance, high-availability, mission-critical business
applications (Figure 5). The Cisco IOS Software universal image with Advanced IP Services feature license (default)
offers basic and advanced routing capabilities to deliver failover protection and load balancing. These capabilities
include Virtual Router Redundancy Protocol (VRRP) (RFC 2338), Hot Standby Router Protocol (HSRP), Multigroup
HSRP (MHSRP), and dial backup with external modem through a virtual auxiliary port. Cisco 890 Series Routers are
integrated with ISDN BRI (892 model) or a V.92 analog modem (891 model) for a secondary WAN backup
connection. If the primary Ethernet-access WAN is disconnected, the router detects this failure and fails over to the
secondary backup WAN.
