PBB QoS

The following QoS processing rules apply for PBB B-VPLS SAPs:

• B-VPLS SAP ingress

  • If dot1p classification is enabled, the BTAG fields will be used by default to evaluate the internal forwarding class (fc) and discard profile if there is a BTAG field.

  • If dot1p classification is not explicitly enabled or the packets are untagged then the default fc and profile is assigned.

• B-VPLS SAP egress

  • If the access port based policy contains FC and profile to dot1p mapping, this entry is used to mark the dot1p bits in the B-TAG of the frame going out of the SAP. The I-Tag of the frame is not modified in any case.

  • If no explicit mapping exists, the related dot1p DE bits are set to zero on both ITAG and BTAG if the frame is originated locally from an I-VPLS. If the frame is transiting the B-VPLS the ITAG stays unchanged, the BTAG is set according to the type of ingress SAP.

    • If the ingress SAP is tagged, the values of the dot1p, DE bits are preserved in the BTAG going out on the egress SAP.

    • If the ingress SAP is untagged, the dot1p, DE bits are set to zero in the BTAG going out on the egress SAP.

• I-SAP Ingress

  • SAP ingress classification using mac-criteria or IP DSCP is supported.

• I-SAP Egress

  • Access port based marking is supported for I-SAPs (dot1q and QinQ SAPs).