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PCP in VDP Reply

PCP in VDP Reply

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PCP in VDP Reply

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  1. PCP in VDP Reply Gu Yingjie (guyingjie@huawei.com) Bob Sultan (bsultan@huawei.com) Li Yizhou (liyizhou@huawei.com) Ben Mack-Crane (tmackcrane@huawei.com)

  2. 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

  3. 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

  4. 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

  5. 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;

  6. 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