PBB Features
Page 450 7210 SAS M Services Guide
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 (for 7210 SAS-M)
• Access port based marking is supported for I-SAPs (dot1q and QinQ SAPs).
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