Siemens S223, S323 user manual Loss of Test Packet Lotp, Configuring ERP, ERP Domain

User Manual		UMN:CLI
SURPASS hiD 6615 S223/S323 R1.5
Normal Node		Normal Node
3. Unblock the
port recovered
from Link Failure		2. Send RM Link Up message
		S
		1. Block RM Node of
		secondary port
		P
Normal Node	2. Send RM Link	RM Node
	Up message
Fig. 8.38 Ring Recovery

8.9.2Loss 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.

8.9.3Configuring ERP

8.9.3.1ERP 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.
	Bridge	DOMAIN-ID: control VLAN ID of domain <1-4094>
no erp domain {all DOMAIN-ID}		Deletes ERP domain.

To specify a description for configured domain, use the following command.

Command	Mode	Description
erp description DOMAIN-ID	Bridge	Specifies a description of domain.
DESCRIPTION

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