CANOGA PERKINS 9145EMP NID Software Version 3.1 - Manual (Page 139)

Service OAM 9145EMP NID Software User’s Manual
Service OAM
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length-value (TLV) component). The network will drop frames above a certain
unsupported MTU, hence the originating MEP will not receive the expected responses.
• 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 informa-
tion 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 con-
figuration are described in section 11.2
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