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Ethernet CFM on Physical Interfaces

CFM can be used to monitor the physical link between two routers. This functionality is similar to that supported by theIEEE 802.3ah LFM protocol. In the following examples, two routers (Router 1 and Router 2) are connected by a point-to-point Gigabit Ethernet link. The link between these two routers is monitored using CFM. This is shown in Figure 12. The single boundary is a “down mep” in CFM terminology.

Figure 12: Ethernet CFM on Physical Interfaces

Image g016837.gif

Router 1

Configure the interface and CFM:



[edit]
interfaces ge-1/0/1 {


unit 0 {
family inet;
}


}

protocols {


oam {


ethernet {


connectivity-fault-management {


maintenance-domain private {
level 0;


maintenance-association private-ma {


continuity-check {
interval 1s;
}




mep 100 {
interface ge-1/0/1;
direction down;
auto-discovery;
}


}


}


}


}


}


}

The configuration on Router 2 mirrors that on Router 1.

Router 2

Configure the interface and CFM:



[edit]
interfaces ge-0/2/5 {


unit 0 {
family inet;
}


}

protocols {


oam {


ethernet {


connectivity-fault-management {


maintenance-domain private {
level 0;


maintenance-association private-ma {


continuity-check {
interval 1s;
}




mep 100 {
interface ge-0/2/5;
direction down;
auto-discovery;
}


}


}


}


}


}


}

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