Atop Technology SE5416A User manual - Manual (Page 30)

Atop Industrial Serial Device Server
SE5408A/SE5416A Series
User Manual V 1.0
30
 SNMP Settings, The SNMP function is disabled by default. To enable this function check
on “Enable SNMP” option. Basic SNMP configurations such as Read/Write Community,
SysName (System Name), SysLocation (System Location), and SysContact (System
Contact) are supported. In addition, you can send SNMP Trap events to a SNMP Trap
server by entering its IP address. The changes will become effective immediately after a
successful save.
Figure 5.10
 ERPS Settings, A typical ring topology provides multipoint connectivity economically, but
the network traffic will loop inside the ring without a proper protection mechanism.
Ethernet Ring Protection Switching (ERPS) is a protocol for Ethernet layer ring networks.
ERPS provides highly reliable and stable protection in the ring topology while not forming
network loops that could potentially affect the network operation. In a the Ring topology,
each Ring Node is connected to an adjacent Ring Node participating in the same Ring
using two independent links (i.e. two ways). Loops can be avoided by guaranteeing that
traffic may flow on all but one of the ring links at any given time. This particular link is
called Ring Protection Link (RPL). A control message called R-APS coordinates the
activities of switching on/off the RPL. Under normal conditions, this link is blocked by the
Owner Node, which is referred as the blocking state. In case of a network failure, the RPL
Owner node will be responsible to unblock the RPL to allow it to be used for forwarding,
hence called the protection state. Therefore, the RPL becomes the backup link when a
link failure occurs. The following table describes the functions of different ERPS settings.