OAM Overview
Page 1370 7750 SR OS Services Guide
Service Diagnostics
Alcatel-Lucent’s Service ping feature provides end-to-end connectivity testing for an individual
service. Service ping operates at a higher level than the SDP diagnostics in that it verifies an
individual service and not the collection of services carried within an SDP.
Service ping is initiated from a 7750 SR router to verify round-trip connectivity and delay to the
far-end of the service. Alcatel-Lucent’s implementation functions for both GRE and MPLS tunnels
and tests the following from edge-to-edge:
• Tunnel connectivity
• VC label mapping verification
• Service existence
• Service provisioned parameter verification
• Round trip path verification
• Service dynamic configuration verification
VPLS MAC Diagnostics
While the LSP ping, SDP ping and Service ping tools enable transport tunnel testing and verify
whether the correct transport tunnel is used, they do not provide the means to test the learning and
forwarding functions on a per-VPLS-service basis.
It is conceivable, that while tunnels are operational and correctly bound to a service, an incorrect
Forwarding Information Base (FIB) table for a service could cause connectivity issues in the
service and not be detected by the ping tools. Alcatel-Lucent has developed VPLS OAM
functionality to specifically test all the critical functions on a per-service basis. These tools are
based primarily on the IETF document draft-stokes-vkompella-ppvpn-hvpls-oam-xx.txt, Testing
Hierarchical Virtual Private LAN Services.
The VPLS OAM tools are:
• MAC Ping — Provides the ability to trace end-to-end switching of specified MAC
addresses. MAC ping provides an end-to-end test to identify the egress customer-facing
port where a customer MAC was learned. MAC ping can also be used with a broadcast
MAC address to identify all egress points of a service for the specified broadcast MAC.
• MAC Trace — Provides the ability to trace a specified MAC address hop-by-hop until the
last node in the service domain.
• CPE Ping — Provides the ability to check network connectivity to the specified client
device within the VPLS. CPE ping will return the MAC address of the client, as well as
the SAP and PE at which it was learned.
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