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Example: IEEE 802.1ag OAM Connectivity Fault Management

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Article ID: KB28755 KB Last Updated: 25 Feb 2014Version: 1.0
Summary:

This article describes Operations, Administration and Maintenance (OAM) Connectivity Fault Management (CFM). It includes an example configuration.

For more information, see Related Links (below).

Cause:

Solution:

OAM protocols and mechanisms help the operator achieve fault management for a service provider.

  • fault indication
  • performance monitoring
  • security management
  • diagnostic functions
  • configuration & service provisioning

The IEEE 802.1ag: Connectivity Fault Management (CFM) family of protocols provides capabilities to detect, verify, isolate, and report end-to-end ethernet connectivity faults.

CFM frames are distinguishable by Ether-Type (0x8902) and dMAC address (for multicast messages).

An example OAM CFM is below.

Topology

Cheese -------------- Transmission Device ---------------- Hamburgerkid

- interval: Interval between continuity-check messages
- loss-threshold: Number of continuity-check messages lost before marking endpoint as down

lab@tendonman-re0# set protocols oam ethernet connectivity-fault-management maintenance-domain 1 maintenance-association 1 mep 1 lowest-priority-defect ?
Possible completions:
all-defects Allows all defects
err-xcon Allows only erroneous CCM and cross connect CCM defects
mac-rem-err-xcon Allows only MAC, not receiving CCM, erroneous CCM and cross connect defects
no-defect Allows no defect
rem-err-xcon Allows only not receiving CCM, erroneous CCM and cross connect CCM defects
xcon Allows only cross connect CCM defect
[edit]
lab@tendonman-re0# set protocols oam ethernet connectivity-fault-management maintenance-domain 1 maintenance-association 1 mep 1 lowest-priority-defect err-xcon ?
Possible completions:
<[Enter]> Execute this command
+ apply-groups Groups from which to inherit configuration data
+ apply-groups-except Don't inherit configuration data from these groups
auto-discovery Accept continuity-check messages from all remote MEPs
direction Direction of maintenance endpoint
> interface Name of interface
priority 802.1p priority of continuity-check and link-trace packet (0..7)
> remote-mep Remote maintenance association endpoint configuration
| Pipe through a command
[edit]
lab@tendonman-re0# set protocols oam ethernet connectivity-fault-management maintenance-domain 1 maintenance-association 1 mep 1 lowest-priority-defect err-xcon


maintenance-domain APACI {
level 5;
maintenance-association E104582270 {
continuity-check {
interval 10s;
loss-threshold 3;
}
mep 1 {
interface ae1.2020;
direction down;
remote-mep 2 {
action-profile IFD;
}
lowest-priority-defect rem-err-xcon;
}
}


Jun 28 21:01:54 HamburgerKid mgd[1352]: UI_CMDLINE_READ_LINE: User 'lab', command 'rename protocols oam ethernet connectivity-fault-management maintenance-domain jsnoh to maintenance-domain Incorrect-MAID '
Jun 28 21:01:54 HamburgerKid mgd[1352]: UI_CFG_AUDIT_NEW: User 'lab' rename: [protocols oam ethernet conne`ctivity-fault-management maintenance-domain jsnoh] to "Incorrect-MAID"
Jun 28 21:01:57 HamburgerKid mgd[1352]: UI_COMMIT_PROGRESS: Commit operation in progress: signaling 'Alarm control process', pid 1208, signal 30, status 0 with notification errors enabled

Jun 28 21:05:06 cheese cfmd[1365]: CFMD_CCM_DEFECT_RMEP: CFM defect: Remote CCM timeout detected by MEP on Level: 0 MD: jsnoh MA: jsnoh-1 Interface: xe-0/0/0.0
Jun 28 21:05:06 cheese rpd[1353]: EVENT <UpDown> xe-0/0/0.0 index 2684275512 <Broadcast Multicast> address #0 80.71.1f.c2.66.0
Jun 28 21:05:06 cheese /kernel: cheese cfmd[1365]: CFMD_CCM_DEFECT_RMEP: CFM defect: Remote CCM timeout detected by MEP on Level: 0 MD: jsnoh MA: jsnoh-1 Interface: xe-0/0/0.0
Jun 28 21:05:06 cheese rpd[1353]: EVENT <UpDown> index 156 <Broadcast Multicast> address #0 80.71.1f.c2.66.0
Jun 28 21:05:06 cheese mib2d[1378]: SNMP_TRAP_LINK_DOWN: ifIndex 512, ifAdminStatus up(1), ifOperStatus down(2), ifName xe-0/0/0
Jun 28 21:05:06 cheese /kernel: cheese mib2d[1378]: SNMP_TRAP_LINK_DOWN: ifIndex 512, ifAdminStatus up(1), ifOperStatus down(2), ifName xe-0/0/0

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