Chapter 17 VLAN Stacking (Q-in-Q) Setup
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*PCP: The Priority Code Point (PCP) is a 3-bit length field which is used to convey priority and
drop eligibility parameters.
*DEI: the Drop Eligible Indicator bit.
*S_VID: The S_VLAN Identifier (VID) is a 12-bit length field uniquely identifying the VLAN to
which the frame belongs. Its value can be between 1 and 4,094.
17.3 Definitions
Priority Code Point (PCP) is user configurable and sets the default value of the priority field of a
newly inserted S-TAG.
Drop Eligible Indicator (DEI) is user configurable. The default value is 0.
TPID of S-TAG is user configurable. The default value is 8100.
Per-port Parameter S-VLAN Port Type defines how a port processes an egress packet. Following
table defines actions of all possible egress processes.
Table 17-1 Egress Process
Port Type Action
Provider When the port transmits a packet that has no S-TAG, the IP6610 inserts
an S-TAG with the receive port’s S-PVID. The Tag process enables a
provider network port to insert an outer tag (S-TAG) for user packets.
Customer The port always removes the S-TAG when a packet is
the port. The process enables a customer network port to remove the
outer tag before it forwards a packet to the customer’s network.
Note: Default WANS are provider ports. Provider ports allow only packets with S-Tag to pass
through. Default LANs are customer ports. Customer ports do not allow packets with S-TAG to
pass An SVLAN group can include members of the customer port group only or the provider
port group only. The SVLAN group cannot include members of both port groups. If the
packets from customer to provider ports want to pass through, IP6610 must set up the
customer ports' PVID same as provider ports' SVID.
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