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Configuration Guide - Ethernet Switching

S7700 and S9700 V200R012C00

This document describes the configuration of Ethernet services, including configuring MAC address table, link aggregation, VLANs, VLAN aggregation, MUX VLAN, VLAN termination, Voice VLAN, VLAN mapping, QinQ, GVRP, VCMP, STP/RSTP/MSTP, VBST, SEP, RRPP, ERPS, LBDT, HVRP, and Layer 2 protocol transparent transmission.
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RAPS PDUs

RAPS PDUs

ERPS protocol packets are called Ring Auto Protection Switching (RAPS) Protocol Data Units (PDUs), which are transmitted in ERPS rings to convey ERPS ring information. Figure 19-5 shows the RAPS PDU format.

Figure 19-5  RAPS PDU format

Table 19-3 describes the fields in an RAPS PDU.

Table 19-3  Fields in an RAPS PDU

Field

Length

Description

MEL

3 bits

Identifies the maintenance entity group (MEG) level of the RAPS PDU.

Version

5 bits

  • 0x00: ERPSv1

  • 0x01: ERPSv2

OpCode

8 bits

Indicates an RAPS PDU. The value of this field is 0x28.

Flags

8 bits

Is ignored upon RAPS PDU receiving. The value of this field is 0x00.

TLV Offset

8 bits

Indicates that the TLV starts after an offset of 32 bytes. The value of this field is 0x20.

R-APS Specific Information

32x8 bits

Is the core field in an RAPS PDU and carries ERPS ring information. There are differences between sub-fields in ERPSv1 and ERPSv2. Figure 19-6 shows the R-APS Specific Information field format in ERPSv1. Figure 19-7 shows the R-APS Specific Information field format in ERPSv2.

TLV

Not limited

Describes information to be loaded. The end TLV value is 0x00.

Figure 19-6  Format of the R-APS Specific Information field in ERPSv1

Figure 19-7  Format of the R-APS Specific Information field in ERPSv2

Table 19-4 describes sub-fields in the R-APS Specific Information field.

Table 19-4  Sub-fields in the R-APS Specific Information field

Sub-Field

Length

Description

Request/State

4 bits

Indicates that this RAPS PDU is a request or state PDU. The value can be:

  • 1101: forced switch (FS)

  • 1110: Event

  • 1011: signal failed (SF)

  • 0111: manual switch (MS)

  • 0000: no request (NR)

  • Others: reserved

Reserved 1

4 bits

Reserved 1 is used in ERPSv1 for message reply or protection identifier.

Sub-code is used in ERPSv2. The value depends on the Request/State field value:
  • If the Request/State field value is 1110, the Sub-code value is 0000, indicating FDB entry update.
  • If the Request/State field value is any other value than 1110, the Sub-code value is 0000 and ignored upon RAPS PDU receiving.

Sub-code

Status

8 bits

Includes the following status information:
  • RPL Blocked (RB) (1 bit): The value 1 indicates that the RPL owner port is blocked; the value 0 indicates that the RPL owner port is unblocked. The nodes where the RPL owner port is not configured set this sub-field to 0 in outgoing RAPS PDUs.

  • Do Not Flush (DNF) (1 bit): The value 1 indicates that FDB entries are not updated when RAPS PDUs are received; the value 0 indicates that FDB entries may be updated when RAPS PDUs are received.

  • Blocked port reference (BPR) (1 bit): The value 0 indicates that ring link 0 is blocked; The value 1 indicates that ring link 1 is blocked.

    BPR is valid only in ERPSv2.

  • Status Reserved: This sub-field is reserved. This sub-field is all 0s during RAPS PDU transmission, and is ignored upon RAPS PDU receiving. In ERPSv1, this sub-field has 6 bits. In ERPSv2, this sub-field has 5 bits.

Node ID

6 x 8 bits

Identifies the MAC address of a node in an ERPS ring. It is informational and does not affect protection switching in the ERPS ring.

Reserved 2

24 x 8 bits

Is reserved and ignored upon RAPS PDU receiving. The value is all 0 during RAPS PDU transmission.

Translation
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Updated: 2019-01-18

Document ID: EDOC1100038843

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