Erps Protocol - ZyXEL Communications MGS3750-28F User Manual

Table 15 Multiple Spanning Tree Protocol Screen
LABEL
Priority
Path Cost

6.4 ERPS Protocol

ITU-T G.8032 Ethernet Ring Protection Switching (ERPS) provides protection and prevents loops for
Ethernet traffic in a ring topology.
Figure 23 ERPS Screen
The following table describes the fields in this screen.
Table 16 ERPS Screen
LABEL
Global ERPS Status
Instance
Search
Meg Level
Ring ID
Ring Level
Control VLAN
Protected-instance
List
Chapter 6 Advanced Application Configurations
DESCRIPTION
Configure the priority for each port here.
Priority decides which port should be disabled when more than one port forms a loop
in a switch. Ports with a higher priority numeric value are disabled first. The allowed
range is between 0 and 255 and the default value is 128.
Path cost is the cost of transmitting a frame on to a LAN through that port. It is
recommended to assign this value according to the speed of the bridge. The slower
the media, the higher the cost.
DESCRIPTION
Enable/disable ERPS function for the entire zone.
Instance range is from 0-15; it works in a way similar to domains in ERRP.
Click Search to find instances.
Used with CFM and is consistent with CFM level. CFM is mainly used for faults other
than linkdown such as one-way connections; ERPS will work normally if CFM is
disabled, but will not be able to detect one-way connection faults.
Ring ID range is 1-239. Ring IDs can be duplicated, but the Control VLAN must be
different, and vice versa.
In an ERPS network, there must be at least one major ring, but there can be multiple
sub-rings. ERPS protocol packets for sub-rings will be passed to the major ring, but
not between major rings.
The Control VLAN range is from 2-4094. The destination VLAN in the ERPS protocol
packet must be a VLAN that does not exist on the system.
Enter the protection instance information in this field. The same port can not be
configured with the same protection instance in different ERPS.
MGS3750-28F User's Guide
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