Erps Operation Mechanism - HPE FlexNetwork 5130 HI SERIES Configuration Manual

ERPS operation mechanism

ERPS uses the detection mechanism defined in ITU-T G.8032/Y.1344 to locate the point of failure
and identify unidirectional or bidirectional faults.
ERPS uses the SF packets to report signal failures on a link and the NR packets to report link
recovery. When a node detects a link status change, the node sends three packets first and then
sends subsequent packets every five seconds.
Link-down report mechanism
Figure 24 Link-down report mechanism
As shown in
1. Device C and Device D detect the link failure and perform the following operations:
a. Block the ports on both side of the faulty link.
b. Periodically send SF packets to other nodes.
2. Device A and Device B receive the SF packets and perform the following operations:
a. Unblock RPL ports.
b. Update the MAC address entries.
Service packets are switched to the RPL link.
Link recovery mechanism
Figure 25 Link recovery mechanism
As shown in
1. Device C and Device D detect the link recovery and perform the following operations:
a. Block the recovered ports.
b. Start the guard timer.
c. Send NR packets.
2. When Device A (owner node) receives the NR packets, it does not perform any operations if it is
in non-revertive mode. If Device A is in revertive mode, it performs the following operations:
Figure 24, the link-down report mechanism uses the following process:
Figure 25, the link recovery mechanism uses the following process:
83