Prerequisites for G.8032 and CFM Microwave Adaptive
Bandwidth Support
•
The microwave transceiver in the network topology must support adaptive bandwidth modulation, and
the microwave transceiver must support the Ethernet Connectivity Fault Management (CFM) extension
for microwave devices as defined by Cisco.
•
All devices connected directly to the microwave transceiver must support signal degradation (SD)
functions. Devices not connected directly to the microwave transceiver can be standard-compliant nodes
or enhanced SD-capable nodes.
•
In any homogeneous ring topology, all links must be microwave links and all devices must support
microwave SD-based ring protection.
•
A ring topology with multiple microwave links can experience a signal degradation condition on one
or more of the microwave links. Only one signal degradation condition per ring instance is supported.
This support is provided on a first-come, first-serve basis, per ring instance.
About G.8032 and CFM Support for Microwave Adaptive
Bandwidth
Microwave Adaptive Bandwidth Feature Functionality
The G.8032 and CFM Support for Microwave Adaptive Bandwidth feature extends the functionality of the
G.8032 Ethernet Protection Ring (ERP) mechanism and Ethernet Connectivity Fault Management (CFM).
This feature enables the G.8032 ERP mechanism to be used as a trigger in response to bandwidth degradation
occurrences (such as a signal degradation [SD] indicator) on microwave links. Ethernet CFM interacts with
the microwave transceiver to continuously check the quality and the bandwidth of the microwave link. When
microwave link degradation (based on the configured service level agreement [SLA] in use) is detected, CFM
notifies the Embedded Event Manager (EEM), which in turn notifies a mechanism such as, G.8032 ERP.
G.8032 ERP ensures that the degraded microwave link is bypassed and no longer used. Depending upon the
severity of the signal degradation and the configured threshold, G.8032 protection switching occurs on a
per-instance basis.
For more information about Ethernet CFM, see the
“
Configuring IEEE Standard-Compliant Ethernet CFM
in a Service Provider Network
”
module or the
“
Configuring Ethernet Connectivity Fault Management in a
Service Provider Network
”
module.
For more information about G.8032 ERP, see the
“
ITU-T G.8032 Ethernet Ring Protection Switching
”
module.
Fixed Versus Adaptive Bandwidth Modulation and the Microwave Adaptive
Bandwidth Feature
Traditional microwave radios use fixed modulation schemes whereby any degradation in the wave propagation
conditions (for example, due to adverse weather conditions such as heavy fog or rain) led to complete loss of
Carrier Ethernet Configuration Guide (Cisco ASR 920 Series)
234
G.8032 and CFM Support for Microwave Adaptive Bandwidth
Prerequisites for G.8032 and CFM Microwave Adaptive Bandwidth Support
Содержание ASR 920 series
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Страница 273: ...Carrier Ethernet Configuration Guide Cisco ASR 920 Series 255 Configuring Ethernet CFM Designing CFM Domains ...
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