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NVO3 NVA Gap Analysis

NVO3 NVA Gap Analysis. Linda Dunbar Donald Eastlake. TRILL Directory Applicability to NVO3. TRILL: L2 in TRILL NVO3: L2 in IP; L3 in IP Goal : Resolve Egress e dge addresses. Variety of Directories (NVAs). Locations:

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NVO3 NVA Gap Analysis

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  1. NVO3 NVA Gap Analysis Linda Dunbar Donald Eastlake

  2. TRILL Directory Applicability to NVO3 • TRILL: L2 in TRILL • NVO3: L2 in IP; L3 in IP • Goal : Resolve Egress edge addresses

  3. Variety of Directories (NVAs) • Locations: • Embedded in routers/switches in the core, or as standalone servers attached to them. • Embedded in Edges or as Standalone servers connected to Edges via the client side Core DIR • Contents: • Each DIR has mapping for a subset of VNs • multiple DIRs have content for a VN DIR DIR DIR

  4. Push Model in TRILL • Policies: When ingress edge can’t find entries for the incoming data frame: • simply drop the data frame, • flood it to all other edges that are in the same VN, or • start the “pull” process to get information from Pull Directory Server(s) (or NVA) • Requesting Push Service: • Push Directory servers (NVAs) (or the Edge by which they are attached) use VN scoped reliable Link State flooding to announce their availability to push mapping information. • Edge nodes use VN scoped reliable Link State flooding to announce all the Virtual Networks in which they are participating • Push: • Directory servers (NVAs) pushed VN scoped entries to Edges. • Incremental Push Service Update • Achieved by Link State Update to distribute the incremental updates.

  5. Push Model: Multiple Directories • When there are multiple Directories for a given VN, all of them can push, and configured number of them actually do. • An Edge takes the content from the Directory with the highest system ID

  6. Pull Model • Request and Reply use separate control channel (Rbridge Channel syntax ) • Pull Request: • Target address family (IPv4/IPv6, [MAC/VLAN]) • Optional: Source Address family (IPv4/IPv6, MAC, VLAN, Source NVE) • Triggered by: • An edge node (NVE) receives an ingress data frame with a destination whose attached edge (NVE) is unknown, or • The edge node (NVE) receives an ingress ARP/ND request for a target whose link address (MAC) or attached edge (NVE) is unknown.

  7. PULL Response • Address mapping, coupled with the valid cache timer • The target being queried is not available, or • The requestor is administratively prohibited from getting an informative response. • If no response is received within a configurable timeout, the request should be re-transmitted with the same Sequence Number up to a configurable number of times that defaults to three.

  8. Push-Pull Hybrid Model • Push model are used for some VNs, and pull model are used for other VNs. • It can be operator’s decision (i.e. by configuration) on which VNs’ mapping entries are pushed down from directory (e.g. frequently used) and which VNs’ mapping entries are pulled (e.g. rarely used). • Useful for Gateway nodes where great number of VNs are enabled. • Or, a portion of hosts in a VN is pushed, other portion has to be pulled.

  9. Cache Consistency • When data in a Pull Directory changes and there may be unexpired stale information at a querying edge (NVE), the Pull Directory must send an unsolicited message to the edge (NVE) to update the pulled entries. • When data in Push model changes, incremental update is sent to all edges that have pushed entries.

  10. Gap Summary • TRILL’s Push and Pull Policies are applicable to NVO3 • TRILL’s Push/Pull requests/reply mechanism are applicable to NVO3 • NVO3’s NVA will need one additional attribute: VN context (VN ID and/or VN Name).

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