Rpr Protection Mechanism; A/B/C Services - Zte ZXA10 S300 Technical Manual

ZXA10 S300 (V1.1) Integrated Access Service Dispatching Unit Technical Manual
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RPR Protection Mechanism

RPR has two protection mechanisms:
Steering
The protection mechanism notifies all nodes on the ring of
the failed span. Every node on the ring will adjust their
topology maps to avoid this span.
Wrapping
Nodes neighboring the failed span will direct packets away
from the failure by wrapping traffic around to the other fiber
(ringlet). This mechanism requires that only two nodes
participate in the protection event. Other nodes on the ring
can send traffic as normal.

A/B/C Services

Sources
The priority in the port register table for ring interface or
local port
The mapping table of IEEE802.1p and priority
The priority of this vlan in VLAN table
The priority of CID in CID table
Traffic matching table
Applications
The ZXA10 S300 supports three types of service: Type A,
Type B and Type C.
Type A: Real-time service
Type B: Containing B-CIR and B-EIR
B-CIR: Committed information rate
B-EIR: Exceeding committed information rate
Type C: Managed service
In customer's opinion, the service is classified into the following
types:
1. Service with restricted bandwidth: Type C service. Ports,
vlans and CIDs are configured. The traffic exceeding port
rate is discarded.
2. Common service: Type C service. There is not any restriction.
3. CIR service: Type B service. Ports, vlans and CIDs are
configured.