Virtual Private LAN Services
7210 SAS M Services Guide Page 451
PBB ACL Support
Filter policies are supported for ingress and egress of PBB I-SAP in both PBB epipe and PBB
VPLS service.
Only MAC criteria Filter policies is available for use with PBB B-SAPs on ingress with the
following functionality:
• For PBB B-VPLS B-SAPs, the MAC filter matches the outer MAC header fields (that is,
B-DA, B-SA, B-Tag) for traffic received on a B-SAP and forwarded to another B-SAP in
the system.
• For PBB B-VPLS B-SAPs, the MAC filter matches the inner MAC header fields (that is,
the customer MAC DA, SA and VLAN tags) for traffic received on a B-SAP and
forwarded out of an I-SAP in the system.
Only MAC criteria filter policies is available for use with PBB B-SAPs on egress. This filter
policy only matches the BCB traffic. BEB traffic (that is, PBB originated traffic) cannot be
matched using the egress filter policy attached to PBB B-SAP.
Configuration Guidelines
Listed below are the configuration guidelines for a PBB service:
• PBB services are supported only on 7210 SAS-M devices configured in network mode.
• A PBB service instance (identified by the ISID) cannot be used to encapsulate customer
payloads with additional VLAN tags, if that service instance is being used to transport
frames received on a QinQ access SAP. If a particular service instance is in use by a QinQ
access SAP, then the system drops the packets that are received with additional tags on all
the SAPs (NULL or Dot1q) using the same instance. Packets received with one or more
tags on a NULL SAP, more than one tag on a Dot1q SAP, and more than two tags on a
QinQ SAP are classified as packets with additional VLAN tags.
• Service MTU is not available for use.
• Port-based SHG is available for use with I-VPLS and B-VPLS service. Service based
SHG is not available for use in an I-VPLS and a B-VPLS service.
• The system uses the internal loopback to flood/replicate BUM traffic received on the B-
SAP, to create an additional copy for processing in the I-VPLS context. The system also
uses the internal loopback to for egress port mirroring. The user needs to ensure that
aggregate amount of mirrored traffic in the system and the BUM traffic received on a B-
SAP does not exceed the available internal loopback bandwidth. Ingress meters can be
used to limit the amount of BUM received and processed from a B-SAP and user can limit
the number of ports setup for port egress mirroring to control the maximum amount of
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