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Dell Configuration Guide for the S4048–ON System 9.14.2.5

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VLAN Stacking

The default TPID for the outer VLAN tag is 0x9100. The system allows you to configure both bytes of the 2 byte TPID.

Previous versions allowed you to configure the first byte only, and thus, the systems did not differentiate between TPIDs with a common first byte. For example, 0x8100 and any other TPID beginning with 0x81 were treated as the same TPID, as shown in the following illustration. Dell EMC Networking OS Versions 8.2.1.0 and later differentiate between 0x9100 and 0x91XY, also shown in the following illustration.

You can configure the first 8 bits of the TPID using the vlan-stack protocol-type command.

The TPID is global. Ingress frames that do not match the system TPID are treated as untagged. This rule applies for both the outer tag TPID of a double-tagged frame and the TPID of a single-tagged frame.

For example, if you configure TPID 0x9100, the system treats 0x8100 and untagged traffic the same and maps both types to the default VLAN, as shown by the frame originating from Building C. For the same traffic types, if you configure TPID 0x8100, the system is able to differentiate between 0x8100 and untagged traffic and maps each to the appropriate VLAN, as shown by the packet originating from Building A.

Therefore, a mismatched TPID results in the port not differentiating between tagged and untagged traffic.

Figure 1. Single and Double-Tag TPID Match
Illustration of single and double-tag TPID match on the C-Series and S-Series.
Figure 2. Single and Double-Tag First-byte TPID Match
Illustration of single and double-tag first-byte TPID match on the C-Series and S-Series.
Figure 3. Single and Double-Tag TPID Mismatch
Single and double-tag TPID mismatch on the C-Series and S-Series.

The following table details the outcome of matched and mismatched TPIDs in a VLAN-stacking network with the S-Series.

Table 1. Behaviors for Mismatched TPIDBehaviors for Mismatched TPID
Network PositionIncoming Packet TPIDSystem TPIDMatch TypePre-Version 8.2.1.0Version 8.2.1.0+
Ingress Access Pointuntagged0xUVWX—switch to default VLANswitch to default VLAN
single-tag (0x8100)0xUVWXsingle-tag mismatchswitch to default VLANswitch to default VLAN
0x8100single-tag matchswitch to VLANswitch to VLAN
0x81XYsingle-tag first-byte matchswitch to VLANswitch to default VLAN
Coreuntagged0xUVWX—switch to default VLANswitch to default VLAN
double-tag 0xUVWX0xUVWXdouble-tag matchswitch to VLANswitch to VLAN
0xUVYZdouble-tag first-byte matchswitch to VLANswitch to default VLAN
0xQRSTdouble-tag mismatchswitch to default VLANswitch to default VLAN
Egress Access Pointuntagged0xUVWX—switch to default VLANswitch to default VLAN
double-tag 0xUVWX0xUVWXdouble-tag matchswitch to VLANswitch to VLAN
0xUVYZdouble-tag first-byte matchswitch to VLANswitch to default VLAN
0xQRSTdouble-tag mismatchswitch to default VLANswitch to default VLAN

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