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FAQ- the RPR features in terms of function of the OptiX OSN 1500 V1R2

Publication Date:  2012-08-12 Views:  391 Downloads:  0
Issue Description
the RPR features in terms of function of the OptiX OSN 1500
Alarm Information

None

Handling Process

None

Root Cause

The EMR0 board of the OptiX OSN 1500 supports resilient packet ring (RPR) features defined by IEEE 802.17. RPR employs a dual-ring structure utilizing a pair of unidirectional counter-rotating rings, as shown in Figure 6-9. Both the outer ring and the inner ring bear data packets and control packets, featuring high bandwidth utilization. The control packets on the inner ring carry control information for the data packets on the outer ring, and the control packets on the outer ring carry control information for the data packets on the inner ring. The two rings act as backup and protection for each other.

  

  Figure 1-1 RPR ring

    Table 1-1 lists the basic functions of the EMR0. 

Table 1-1 EMR0 function list 

Function

EMR0

Port number

1 GE+12 FE

Interface type

10/100Base-TX, 100Base-FX, 1000Base-SX/LX/ZX

Service frame format

Ethernet II, IEEE 802.3, IEEE 802.1QTAG

JUMBO frame

Supported, 9600 bytes

Maximum uplink bandwidth

16 VC-4 (2.5 Gbit/s)

Mapping

VC-3, VC-3-2v, VC-4, VC-4-Xv (X≤16)

Ethernet virtual private line (EVPL)

Supported

Ethernet virtual private LAN (EVPLAN)

Supported

MPLS

Support MartiniOE and VMAN

VLAN

IEEE 802.1q/p

Spanning tree

Support STP and RSTP

Multicast (IGMP Snooping)

Supported

RPR protection

Steering, Wrapping, Wrapping + Steering. The switching time is less than 50ms.

Encapsulation

GFP, compliant with ITU-T G.7041.

LAPS, compliant with ITU-T X.86.

LCAS

Supported, compliant with ITU-T 7042.

CAR

Based on port or port + VLAN, with the granularity as 64 kbit/s.

Flow control

Supported, compliant with IEEE802.3X and IEEE802.3Z.

Weighted fairness algorithm

Supported

Topology discovery

Supported

Maximum node number

255

Service class

A0, A1, B_EIR, B_CIR and C

The user service has three classes, A, B and C. Class A falls into A0 and A1. Class B falls into B_CIR (Committed Information Rate) and B_EIR (Excess Information Rate). Table 1-2 gives the difference of these classes.

Table 1-2 RPR service class
  

Class

Sub-class

Bandwidth

Jitter

Fair algorithm

Application

A

A0

Allocated, irreclaimable

Low

Irrelevant

Real time

A1

Allocated, reclaimable

Low

Irrelevant

Real time

B

B_CIR

Allocated, reclaimable

medium

Irrelevant

Near real time

B_EIR

Opportunistic

High

Relevant

Near real time

C

C

Opportunistic

High

Relevant

Best effort

 
Suggestions

None

END