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Requested revision
Standard:IEEE 802.1CBClause:10
Clause title:Frame Replication and Elimination for Reliability
Rationale for revision
Implementations need to expose its scaling/limits, to a network management entity, especially in the context of the centralized configuration approach outlined in IEEE 802.1Qcc.
Proposed text
Add scaling parameters to FRER. Note, that many of the suggested objects are modeled the same ways as the VLAN-related objects maxVlanId, maxSupportedVlans and NumVlans (IEEE 802.1Q-2018, clause 17.2.4, "Ieee8021QbridgeEntry"). Insert the following item in the itemized list in clause 10 after item a) and before item b), renumbering as appropriate: "b) The implementation specific Frame Replication and Elimination for Reliability (FRER) Parameters (9.4) that are exposed for inspection by (and alignment of) network management entities." Insert the following subclauses after clause 10.1 and before clause 10.2, renumbering as appropriate: "10.2 Frame Replication and Elimination for Reliability Parameters The Frame Replication and Elimination for Reliability Parameters summarize a set of management objects that expose the properties of an implementation. NOTE: For the Sequence identification table no dedicated limits are necessary, as the number of entries is determined indirectly by the number of ports and the number of possible directions. It is not possible that different encapsulation types are used on the same port. 10.2.1 frerSeqGenTblLength The supported length of the Sequence generation table. 10.2.2 frerSeqGenTblCount The number of currently configured Seqnece generation entries Seqeuence generation table. 10.2.3 frerSeqRcvyTblLength The supported length of the Sequence recovery table. 10.2.4 frerSeqRcvyTblCount The number of currently configured Seqnece recovery entries Seqeuence recovery table. 10.2.5 frerSeqRcvyAlgorithmsSupported The list of sequence recovery algorithms supported by this device. 10.2.6 frerSeqRcvyVectorHistoryLengthMax The maximum history length for the vector recovery algorithm this device supports. If this device does not support vector recovery (10.2.7), this parameter should be set to 0. 10.2.7 frerSeqRcvyResetTimeoutMax The maximum reset timeout for the sequence recovery function expressed in units of milliseconds supported by this device. 10.2.8 frerSeqEncEncapsTypesSupported The list of sequence encapsulation types supported by this device. 10.2.9 frerAutoconfigurationSupported A boolean value indicating if autoconfiguration is supported by this device. 10.2.10 frerStreamSplitSupported A boolean value indicating if the stream split table (10.6) is supported by this device. 10.2.11 frerLatentErrorDetectionSupported A boolean value indicating if latent error detection is supported by this device. 10.2.12 frerSupportedPorts The list of ports on which FRER is supported, i.e., which can be configured in frerSeqRcvyPortList (10.4.1.2), frerSeqEncPort (10.5.1.2), frerSplitPort (10.6.1.1), frerAutSeqReceivePortList (10.7.1.1.2), frerAutSeqRecoveryPortList (10.7.1.1.5), or frerAutOutPortList (10.7.2.1.1)."
Impact on existing networks
None. Existing networks might or might not be checking those max values anyway. This change just allows applications to see the limitations of the implementation and act accordingly.
Originator
Name:Marina GutierrezEmail:marina.gutierrez@tttech.com<mailto:marina.gutierrez@tttech.com>
Affiliation:TTTech Computertechnik AG
Submitted:2021-04-12