ERPS protocol packets
ERPS protocol packets are Ring Automatic Protection Switching (R-APS) packets. You can configure the R-APS packet level. A node does not process R-APS packets whose levels are greater than the level of the packets sent by the node. On a ring, the levels of R-APS packets must be the same for all nodes in an ERPS instance.
Table 14: R-APS packet types and functions
Packet type | Function |
|---|---|
No request, RPL block (NR-RB) | When the link is stable, an owner node in idle state periodically sends NR-RB packets to inform other nodes that the RPL ports are blocked. The nodes that receive the NR-RB packets unblock available ports and update MAC address entries. |
No request (NR) | After the link fault is cleared, the node that detects the recovery periodically sends NR packets. When the owner node receives the NR packets, it starts the WTR timer. The node stops sending NR packets after receiving NR-RB packets from the owner node. |
Signal fail (SF) | When a link fails to send or receive signals, the node that detects the fault periodically sends SF packets. When the owner node and neighbor node receive the FS packets, they unblock the RPL ports. The node stops sending SF packets after the fault is cleared. |
Manual switch (MS) | A port configured with the MS mode is blocked and periodically sends MS packets. When other nodes receive the MS packets, they unblock available ports and update MAC address entries. |
Forced switch (FS) | A port configured with the FS mode is blocked and periodically sends FS packets. When other nodes receive the FS packets, they unblock all ports and update MAC address entries. |
Flush | If the topology of a subring changes, the interconnection ports on the subring broadcasts flush packets. All nodes that receive the flush packets update MAC address entries. |
![[NOTE: ]](images/note.png) | NOTE:
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