IP Router Configuration
7705 SAR OS Router Configuration Guide 25
Facility MEPs are created in the same way as service MEPs, by configuring the ETH-CFM
domain and association. However, the association used to build the facility MEP does not
include a bridge identifier, as the facility MEP is not bound to a service. The CLI ensures that
a bridge identifier is not configured when the association is applied to a facility MEP.
The following applies to facility MEPs on network interfaces:
• the MEP must be a Down MEP
• the port must be in network mode
• the port must be configured for null or dot1q encapsulation
• the MEP supports all fault management functionality, with the exception of alarm
indication signaling (AIS)
• the MEP supports all performance monitoring functionality including synthetic loss
measurement (SLM)
• the MEP supports throughput measurement via loopback messaging at wire speed
• received CFM messages are processed only when the VLAN ID, the MAC
destination address, and the MEP level matches those of the MEP
Network interface facility MEPs are supported on all network Ethernet ports on the
7705 SAR adapter cards and chassis.
For detailed information on ETH-CFM entities and on ETH-CFM support for services, refer
to the 7705 SAR OS Services Guide, “ETH-CFM (802.1ag and Y.1731)”. For information on
running Ethernet OAM tests, refer to the 7705 SAR OS OAM and Diagnostics Guide, “ETH-
CFM (802.1ag and Y.1731)”.
System Interface
The system interface is associated with the node, not a specific interface. It is used during the
configuration of the following entities:
• LSP creation (next hop) — when configuring MPLS paths and LSPs
• the addresses on a target router — to set up an LDP, OSPF, or BGP session between
neighbors and to configure SDPs (the system interface is the service tunnel endpoint)
The system interface is also referred to as the loopback interface. It is used as the router
identifier if a router ID has not been explicitly configured. Additional loopback interfaces can
be configured; however, the system interface is a special loopback interface.
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