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S12700 V200R012C00 Configuration Guide - Ethernet Switching

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, and Layer 2 protocol transparent transmission.
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Implementation of a Single RRPP Ring (When the Ring is Complete)

Implementation of a Single RRPP Ring (When the Ring is Complete)

Implementation of a Single RRPP Ring

When all the links and nodes on a single ring are Up, the master node is in Complete state.

In Figure 18-6, the master node blocks its secondary interface to prevent broadcast loops caused by data packets. The blocked secondary interface can only receive RRPP packets but cannot forward data packets. Hello packets sent by the master node to monitor the ring status can pass through the secondary interface.

Figure 18-6  Complete RRPP ring

Polling Mechanism

The master node uses a polling mechanism to monitor the ring status and perform operations by sending Hello packets.

Hello timer and Fail timer

The polling mechanism uses the Hello timer and Fail timer.

  • The value of the Hello timer specifies the interval at which the master node sends Hello packets from the primary interface.

  • The value of the Fail timer specifies the maximum delay in which the primary interface sends a Hello packet and the secondary interface receives the Hello packet.

  • The value of the Fail timer must be three times or larger the value of the Hello timer.

The master node determines whether to unblock the secondary interface by sending a Hello packet according to the value of the Hello timer and checking whether the secondary interface receives the Hello packet within the delay specified by the Fail timer.

Process of the polling mechanism

The process of the polling mechanism is as follows:

  1. The master node periodically sends a Hello packet from its primary interface based on the value of the Hello timer.

  2. The Hello packet is transmitted along transit nodes on the ring, as shown in Figure 18-6. The master node typically receives the Hello packet on its secondary interface.

    • If the secondary interface on the master node receives the Hello packet before the Fail timer times out, the master node considers the ring complete.

    • If the secondary interface on the master node does not receive the Hello packet after the Fail timer times out, the master node considers the ring faulty.

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Updated: 2019-01-18

Document ID: EDOC1100038103

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