A10E/A28E/A28F Configuration Guide
MST ID: 4
-----------------------------------------------------------
BridgeId: Mac 0000.0000.0003 Priority 32768
RegionalRoot: Mac 0000.0000.0001 Priority 32768 InternalRootCost
200000
PortId PortState PortRole PathCost PortPriority LinkType TrunkPort
-------------------------------------------------------------------------
2 forwarding root 200000 128 point-to-point no
3 discarding alternate 200000 128 point-to-point no
…
7.6 ERPS
7.6.1 Introduction
Ethernet Ring Protection Switching (ERPS) is an APS protocol over ITU-T G.8032
recommendation. It is specially used in Ethernet ring link protocol. Generally, ERPS can
avoid broadcast storm caused by data loopback. When Ethernet has loop or device
malfunction, ERPS can switch the link to backup link and ensure service restore quickly.
ERPS takes the control VLAN in ring network to transmit ring network control information
and meanwhile, combining with the topology feature of ring network to discover network
fault quickly and enable backup link to restore service fast.
7.6.2 Preparing for configurations
Scenario
With the development of Ethernet to telecom level network, voice and video multicast
services bring forth higher requirements on Ethernet redundant protection and fault-restore
time. The fault-restore convergent time of current STP system is in second level that is far
away to meet requirement. ERPS can blocks a loop to avoid broadcast storm by defining
different roles in the ring under normal situations. ERPS can switch the service link to backup
link if the ring link or node faults and remove loop, perform fault protection switch and
automatic fault restore, what's more, the protection switching time is lower than 50ms. It
supports single ring, crossed rings and tangent rings networking modes.
ERPS supports fault detection in two modes:
Fault detection based on physical interface status: to get link fault and switching quickly,
available to neighbor devices
Fault detection based on CFM: used in unidirectional fault detection or on multiple
devices
Prerequisite
Connect interface and configure physical parameters for it, the interface is Up at physical
layer.
Create VLAN, and add interfaces to the VLAN.
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