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NE40E-M2 V800R010C10SPC500 Feature Description - LAN Access and MAN Access 01

This is NE40E-M2 V800R010C10SPC500 Feature Description - LAN Access and MAN Access
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Association Between ERPS and Ethernet CFM

Association Between ERPS and Ethernet CFM

When a transmission device is connected to an Ethernet Ring Protection Switching (ERPS) ring and fails, ERPS, in absence of an automatic link detection mechanism, cannot quickly detect the device failure. This issue will make convergence slow or even cause service interruption in worse cases. To resolve this problem, ERPS can be associated with Ethernet connectivity fault management (CFM).

After Ethernet CFM is deployed on ERPS nodes connecting to transmission devices and detects a transmission link failure, Ethernet CFM informs the ERPS ring of the failure so that ERPS can perform fast protection switching.

NOTE:

Currently, ERPS can be associated only with outward MEPs.

On the network shown in Figure 12-14, Device A, Device B, and Device C form an ERPS ring. Three relay nodes exist between Device A and Device C. Ethernet CFM is configured on Device A and Device C. Interface 1 on Device A is associated with Interface 1 on Relay 1, and Interface 1 on Device C is associated with Interface 1 on Relay 3.

In normal situations, the RPL owner port sends R-APS (NR) messages to all other nodes on the ring at an interval of 5s, indicating that ERPS links are normal.

Figure 12-14 ERPS ring over transmission links (links are normal)

If Relay 2 fails, Device A and Device C detect the Ethernet CFM failure, block their Interface 1, send R-APS (SF) messages through their respective interfaces connected to Device B, and then perform a Filtering Database (FDB) flush.

After receiving an R-APS (SF) message, Device B unblocks the RPL owner port and performs an FDB flush. Figure 12-15 shows the networking after Relay 2 fails.

Figure 12-15 ERPS ring over transmission links (Relay 2 fails)

After Relay 2 recovers, Relay2 in revertive switching mode re-blocks the RPL owner port and sends R-APS (NR, RB) messages.

After Device A and Device C receive an R-APS (NR, RB) message, Device A and Device C unblock their blocked Interface 1 and perform an FDB flush so that traffic changes to the normal state, as shown in Figure 12-14.

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Updated: 2019-01-02

Document ID: EDOC1100058405

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