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PCP in VDP Reply. Gu Yingjie ( [email protected] ) Bob Sultan ( [email protected] ) Li Yizhou ( [email protected] ) Ben Mack-Crane ( [email protected] ). Review of Physical Machine.

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review of physical machine
Review of Physical Machine
  • End-station could send C-tagged traffic or untagged traffic on port; We assume traffic as untagged;
  • Tagging performed per Port by Bridge
    • Priority value maybe tagged by Bridge

server

Bridge

DA, SA, T/L, Payload

DA, SA, CTAG[PCP=5, CFI=0, VID] T/L, Payload

Server A

Port X

model in evb
Model in EVB

server

bridge

tagging

entity

  • VM is aware of VSI as a port;
    • VMcould send C-tagged traffic on port but we assume traffic is untagged;
  • Tagging performed per VSI by ‘tagging entity’ under control of hypervisor;
    • could be Customer Edge Port of Edge Relay device;
    • PCP may also be tagged in traffic

VM A

VSI x

DA, SA, T/L, Payload

DA, SA, CTAG[PCP=5, VID] T/L, Payload

DA, SA, T/L, Payload

DA, SA, CTAG[PCP=3, VID] T/L, Payload

VM B

VSI y

hypervisor knowledge of pcp
Hypervisor knowledge of PCP

server

bridge

VDP req (VSI x TLV [PCP=null, VID=96])

  • Hypervisor might maintain relationship between each VSI and corresponding value of PCP; or
  • PCP could be supplied by network, based on information in VSI-type;
  • PCP value supplied on VDP rsp;

VDP rsp (VSI x TLV [PCP=5, VID=96])

hypervisor

VDP req (VSI y TLV [PCP=null, VID=114])

VDP rsp (VSI y TLV [PCP=3, VID=114])

VM A

VSI x

DA, SA, T/L, Payload

DA, SA, CTAG[5, 96] T/L, Payload

DA, SA, T/L, Payload

DA, SA, CTAG[3, 114] T/L, Payload

VM B

VSI y

proposal
Proposal
  • VDP reserves 2 octets for VID which occupies only 12bits;
  • PCP proposal requires no additional field, it could be carried in the rest 4bits in VID field;
proposal1
Proposal

P/V

(2 octets)

  • Communicate 3-bit of PCP value on VDP rsp to aid;
    • 1-bit PCP Significant (PS) distinguishes PCP = 0 from PCP not specified;
    • Use high-order bits already reserved in VID field of VDP TLVs;
  • If more than one Filter Info Entry then
    • PCP specified by first (or last) entry with PS = true; or
    • PCP specified distinctly for each VID with PS = true;
      • no preference on this
  • Applicable to all four currently defined VDP TLV formats (only one illustrated above);
  • Current ‘VID’ field of VDP TLV changed to PV (PCP/VID);
    • did not want to choose TCI since the information contained is not identical to TCI.

PS

PCP

VID

1

bit:

0

4

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