Configuring ITU-T Y.1731 ETH-ED grace period notifications
ETH-ED grace period notification description
ITU-T Y.1731 performance monitoring provides standards-based Ethernet performance monitoring that encompasses the measurement of Ethernet frame delay, frame delay variation, and frame loss and throughput as outlined in the ITU-T Y-1731 specification and interpreted by the Metro Ethernet Forum (MEF).
The ETH-ED (Ethernet Expected Defect) function of the ITU-T Y.1731 standard is used by a MEP to signal to its peer MEPs, the transmission of CCM frames is expected to be interrupted, without any interruption to data frames. The consequent loss of continuity defects at the peer MEPs is also suppressed. Frames with ETH-ED information carry the MEP ID of the MEP and the expected duration of the interruption.
You can enable ETH-ED grace period notification for MEPs using the Grace Period TX Enabled parameter located on the NE Properties form (Globals tab, OAM sub-tab); see To modify NE properties.
When grace period notification is enabled, you can perform specific ITU-T Y.1731 ETH-ED protocol configurations using the following parameters located on the supported object Grace panel: Eth VSM Rx Enable, Eth VSM Tx Enable, Rx Enable, Tx Enable, Max Rx Defect Window, and Priority. See the XML API Reference for information about configurable parameters and their applicability. See Table 91-1, Supported objects and configuration guideline for Grace ETH-ED period notifications for supported object types for grace period notifications and configuration guidelines.
Table 91-1: Supported objects and configuration guideline for Grace ETH-ED period notifications
Supported network object |
Configuration guidelines |
---|---|
Ethernet Tunnel |
See ... To configure an Ethernet tunnel endpoint Navigate to: Service Tunnels→Ethernet Tunnel→Create→Tunnel Properties→Tunnel End points→Ethernet Tunnel Path Endpoint→MEPs→General tab (Grace panel) |
Ethernet Ring Element |
See ... To configure an Ethernet Ring Element Navigate to: Ring Element→MEP tab→Create ETH-CFM Global→MEPs→General tab (Grace panel) |
Routing Instance Interface |
See ... To configure a routing instance or a VRF instance Navigate to: NE Routing Instance→Router Interface Properties→MEPs→General tab (Grace panel) Note -- Ensure the port is associated with the Router Interface |
SAP MEPs associated with EPIPE, IPIPE, VPLS, IES, and VPRN services |
See ... To configure a MEP on a SAP Navigate to: Service type→Sites→L2 (or L3) Access Interface→SAP Properties→OAM tab→ETH-CFM tab→Create MEP→MEPs (Grace panel) |
Subscriber Interface MEPs associated with IES, and VPRN services |
See ... To configure a subscriber interface on an IES or To configure a subscriber interface on a VPRN Navigate to: Service type→Sites→Subscriber Interfaces→Group Interfaces→Service Access Points Properties→OAM tab→ETH-CFM tab→Create MEP→MEPs (Grace panel) |
Spoke SDP Binding or Mesh SDP MEP associated with EPIPE, VPLS, IES, and VPRN services |
See ... To create a MEP on a VPLS SDP binding Navigate to: Service type→Sites→Spoke SDP Bindings Properties→OAM tab→ETH-CFM tab→Create MEP→MEPs (Grace panel) |
LAG MEP |
See ... To create a LAG or To modify a LAG Navigate to: NE→Logical Groups→LAGS→Properties→MEPs→Create MEP→MEPs (Grace panel) |
Port/Facility MEPs |
See ... Facility MEP Navigate to: Port Properties→Ethernet tab→MEPs (Grace panel) |
ETH-ED enforcement rules
The NFM-P applies the following enforcement rules for ETH-ED grace period notifications:
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When a soft-reset occurs on the node, if ETH-ED transmit and receive are both enabled, then Grace ETH-ED takes precedence over Grace ETH-VSM. CCM should be enabled when a soft-reset occurs. Only when is CCM is enabled will the grace protocols be applied.
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Transmitting Grace field will read the protocol ETH-ED for the maximum Rx defect window value.
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Any MEP transmitting the Grace ETH-ED defect protocol must have CCM enabled.
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When a soft-reset occurs, no configurations can be added or changed either on the node or using the NFM-P.
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When a soft-reset occurs on the node, if ETH-VSM transmit and receive are both enabled, then Grace ETH-VSM takes precedence over Grace ETH-ED.