Installation and User Manual
EtherHaul
1200™
EH-INST-02, Issue 4.0
Page 93
7.2.7
Working with CCM Messages
An MEP can periodically transmit a multicast Connectivity Check Message (CCM)
announcing the identity of the MEP and its MA. The MEP also tracks CCMs received
from the other MEPs.
The following information is displayed per CCM message stored:
Eth Source Address
VLAN Priority (PCP)
Drop Eligibility
VLAN ID
MD Level
Version
RDI
CCM Interval
Sequence Number
Counters: TxFCf, RxFCb, TxFCb
If present:
Sender Chassis Subtype and ID
Management Address Domain
Management Address
Port Status -- {blocked | up} (according to IEEE 802.1ag Table 21-10
Interface Status -- {up | down | testing | unknown | dormant | not-present
| lower-layer-down} according to IEEE 802.1ag Table 21-1
Other TLVs: Type, Data as hexadecimal string
To display this information, use the following commands:
show cfm-ccm [{<md-idx-list> | all} [{<ma-idx-list> | all}
[{<mepid-list> | all}]]] last-error-ccm
and
show cfm-ccm [{<md-idx-list> | all} [{<ma-idx-list> | all}
[{<mepid-list> | all}]]] last-xcon-ccm
Table
11-14
on page 204 lists and describes the CCM message attributes.
Refer to
Figure 7-13 CFM Peer MEP Setup
for CCM status monitoring.
