Layer 2 Control Processing (L2CP)
Page 86 7210 SAS-X, R6 OS Services Guide
context of the SAP and the service. Else if the received packet is untagged and none of the NULL
or dot1q default or dot1q explicit null or 0.* SAP is configured, it is discarded.
If a 7210 receives a tagged L2CP packet on any SAP (includes NULL, dot1q, dot1q range, QinQ,
QinQ default), it is forwarded transparently in the service similar to normal service traffic (xSTP
processing behavior is different in VPLS service and is listed below).
The xSTP processing behavior in a VPLS service is as follows:
• If xSTP is enabled in the service , and if the tag in the STP BPDU matches the tag of the
configured SAP, the received xSTP BPDU is processed by the local xSTP instance on the
node for that service when xSTP is enabled on the SAP and discarded when xSTP is
disabled on the SAP.
• If the tags do not match, xSTP BPDU packets are transparently forwarded in the service
similar to normal service traffic.
• If xSTP is disabled in the service, STP BPDU packets are transparently forwarded in the
service similar to normal service traffic.
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