Directory assisted rbridge edge draft dunbar trill directory assisted edge 05 update
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Directory Assisted RBridge Edge draft-dunbar-trill-directory-assisted-edge-05 Update. Linda Dunbar: [email protected] Donald Eastlake:[email protected] Radia Perlmen : [email protected] Igor Gashinsky: [email protected]

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Directory assisted rbridge edge draft dunbar trill directory assisted edge 05 update

Directory Assisted RBridge Edgedraft-dunbar-trill-directory-assisted-edge-05Update

Linda Dunbar: [email protected]

Donald Eastlake:[email protected]

RadiaPerlmen: [email protected]

Igor Gashinsky: [email protected]


Major changes since draft dunbar trill directory assisted edge 04 ietf82
Major changes since draft-dunbar-trill-directory-assisted-edge-04 (IETF82)

  • Addressed comments from mailing list and discussions from 82nd IETF

    • Make the draft focusing on the benefits and generic operation of directory services

      • Minimum attributes in directory servers

      • Pull model

      • Push model

    • Removed technical details like how RBridge intercept ARP/ND requests and forward them to directory servers

      • Push model: Need separate draft(s) on detailed mechanism for directory to push down initial full mapping and subsequent updates

      • Pull model: Need separate draft(s) on detailed messaging exchange between Directory Servers and RBridge.

  • Goal: WG adopt the Directory Assisted TRILL edge concept


Trill in data center
TRILL in Data Center

L3 routed domain

  • Server can be loaded with applications under any subnets

  • Minimal IP re-config needed

TRILL Domain

  • Why different?

  • Rapid work load shifting

    • Reduce or increase the number of racks when demand changes.

    • Allow servers to be re-loaded with different applications under different subnets without any physical moving or IP re-configuration.

  • VMs can be moved to any rack without IP re-configuration on any switches


Benefit of using directory in data center
Benefit of using directory in Data Center

  • Avoid flooding unknown DA across RBridge domain.

  • Avoid designating one port as AF port:

    • directory assisted RBridge edge doesn’t need to flood unknown DA data frames across RBridge domain

  • Reduce flooding decapsulated Ethernet frames with unknown MAC-DA to a bridged LAN connected to RBridge edge ports.

  • Reduce the amount of MAC&VLAN <-> RBridgeEdge mapping maintained by RBridge edge.

    • No need for an RBridge edge to keep the MAC entries for hosts which don’t communicate with hosts attached to the RBridge edge.


Push vs pull models
Push vs. Pull models

  • Push Model

    • Pros: less processing

    • Cons: more entries than they really need

  • Pull Model

    • pulls the MAC&VLAN<->RBridgeEdge mapping entry from the directory server when needed.

    • Pros : smaller set because entries age out after awhile

    • Cons: more processing


Next step
Next Step

  • Move to WG draft


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