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S9300 and S9300E Series Switches Product Description

This document describes the positioning, characteristics, architecture, link features, service features, application scenarios, operation and maintenance functions, and technical specifications of the switch.
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RRPP

RRPP

When common Ethernet ring networks are used, RRPP is used instead of MSTP to achieve fast convergence of network topologies.

Generally, metro Ethernet uses two-layer rings:

  • The aggregation layer lies between PE-AGGs, for example, RRPP Domain 1 shown in Figure 3-6.

  • The access layer lies between PE-AGGs and UPEs, for example, RRPP Domain 2 shown in Figure 3-6.

Figure 3-6 Network diagram of RRPP applied to intersecting RRPP rings

As shown in Figure 3-6, Ring 1 belongs to Domain 1; Ring 2 belongs to Domain 2. Ring 1 and Ring 2 are tangent at SwitchC.

  • On Ring 1, SwitchC is the master node; SwitchC, SwitchE, SwitchF, and SwitchG are PE-AGGs.

  • On Ring 2, SwitchC is the master node; SwitchA, SwitchB, and SwitchD are UPEs.

For multiple tangent RRPP rings, a ring failure will not affect other domains. The RRPP ring convergence process in a domain is the same as that of a single ring.

On RRPP rings, Layer 2 and Layer 3 services can be fast switched in the event of link faults.

  • Fast switch of Layer 2 services

    In normal situations, the data flow travels along SwitchA → SwitchB → SwitchC on Ring 2. If the link between SwitchA and SwitchB fails, the data flow switches to another path on the RRPP ring.

    After the link between SwitchA and SwitchB fails, the master node is notified of the link fault and immediately unblocks the secondary port.

    At this time, the network topology changes, the original MAC address tables of the nodes cannot correctly direct Layer 2 forwarding. Layer 2 traffic is interrupted. After unblocking the secondary port, the master node immediately requires other nodes on the ring to re-learn MAC address entries. The Layer 2 traffic on the RRPP ring is then switched to travel along SwitchA → SwitchD → SwitchC.

  • Fast switch of Layer 3 services

    In normal situations, the data flow travels along SwitchC → SwitchE → SwitchF on Ring 1. If the link between SwitchC and SwitchE fails, the data flow switches to another path on the RRPP ring.

    After the link between SwitchC and SwitchE fails, the master node is notified of the link fault and immediately unblocks the secondary port.

    At this time, the network topology changes, so the original ARPs and FIBs of the nodes cannot direct Layer 3 forwarding. After unblocking the secondary port, the master node immediately requires other nodes on the ring to re-learn MAC address entries. The Layer 2 traffic on the RRPP ring is then switched to travel along SwitchC → SwitchG → SwitchF.

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Updated: 2019-08-21

Document ID: EDOC1000027369

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