CANOGA PERKINS 9145EMP NID Software Version 4.0 - Manual (Page 146)

Service OAM 9145EMP NID Software User’s Manual
Service OAM
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• Linktrace Protocol: The linktrace message (LTM) traces the path from a source MEP to
a destination MP in the same MA or MEG. All intermediate MIPs respond with a linktrace
reply (LTR) to the source MEP. Only the MIPs in the path between the source and desti-
nation will respond. LTM procedures are executed on demand and are initiated by admin-
istrators.
• Alarm Indication Signal (AIS): AIS is a fault isolation method, applicable only to Y.1731
procedures. Using AIS messages, a lower level domain notifies a higher level domain of
connectivity errors detected at that particular lower level. Upon detecting an AIS mes-
sage, a higher level MEP will suppress all other defects detected at its level; the AIS indi-
cates that there is a defect at an underlaying level, hence that defect has to be solved
first.
• Remote Defect Indication (RDI): A MEP can indicate to its peers, through an RDI flag,
that it has encountered a defect, either local or remote. This information is advertised via
CCM messages to all MEPs in the MA/MEG. The RDI flag is set for as long as the error
condition is active.
The differences between 802.1ag and Y.1731 SOAM protocol support are shown in Table 11-1.
Table 11-1. SOAM protocol support for 802.1ag and Y.1731
11.1.4 Optional SOAM Configuration
SOAM can be configured to send additional informations about the 9145EMP NID, using Sender
ID TLVs and/or Port ID TLVs.
Sender ID TLVs are optional extensions to SOAM packets, used to carry identification
information about the system that originates a particular packet. The system may be identified
using a textual string or a MAC or IP address associated with the NID. Details about Sender ID
TLV configuration are described in section 11.2
Sender ID TLVs may be included, based on configuration, in CCM, LBM, and LTM packets. The
far end system, upon receiving a packet containing a Sender ID TLV, parses and displays this
information, which better identifies a particular node. The 9145EMP NID displays the content of
the Sender ID TLVs received from far end system in the Connectivity Check Database (see
section 11.6.5).
Feature
802.1ag Y.1731
Continuity check Yes Yes
Connectivity Fault Management
Loopback
Unicast
Multicast
Sweep
Yes
N/A
Yes Yes
Yes
Yes
Linktrace Yes Yes
AIS N/A Yes
RDI Yes Yes