Siemens S223 - Manual (Page 267)

User Manual UMN:CLI
SURPASS hiD 6615 S223/S323 R1.5
A50010-Y3-C150-2-7619 267
3. Unblock the
port recovered
from Link Failure
2. Send RM Link Up message
Normal Node Normal Node
Normal Node RM Node
P
S
2. Send RM Link
Up message
1. Block RM Node of
secondary port
Fig. 8.38 Ring Recovery
8.9.2 Loss of Test Packet (LOTP)
ERP recognizes the Link Failure using Loss of Test Packet (LOTP). RM Node regularly
sends RM Test Packet message. If the message is not retransmitted to RM Node through
Ethernet Ring, it means that Loop doesn’t occur. Therefore, RM Node unblocks Secon-
dary port. The condition that RM Test Packet from RM Node doesn’t return is LOTP state.
On the other hand, if RM Test Packet is retransmitted to RM Note through Ethernet Ring,
Loop may occur. In this condition, RM Node blocks Secondary port.
8.9.3 Configuring ERP
8.9.3.1 ERP Domain
To realize ERP, you should fist configure domain for ERP. To configure the domain, use
the following command.
Command Mode Description
erp domain DOMAIN-ID
Creates ERP domain.
DOMAIN-ID: control VLAN ID of domain <1-4094>
no erp domain {all | DOMAIN-ID}
Bridge
Deletes ERP domain.
To specify a description for configured domain, use the following command.
Command Mode Description
erp description DOMAIN-ID
DESCRIPTION
Bridge Specifies a description of domain.