Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 652
Debug VLAN Stacking, VLAN Stacking in Multi-vendor Networks
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www.dell.com | support.dell.com Debug VLAN Stacking To debug the internal state and membership of a VLAN and its ports, use the debug member command, as shown in Figure 36-5. The port notations in Figure 36-5 are as follows: • MT - stacked trunk • MU - stacked access port • T- 802.1Q trunk port • U- 802.1Q access port • NU- Native VLAN (untagged) Figure 36-5. Example of Output of debug member vlan and debug member port Force10# debug member vlan 603 vlan id : 603 ports : Gi 2/47 (MT), Gi 3/1(MU), Gi 3/25(MT), Gi 3/26(MT), Gi 3/27(MU) Force10#debug member port gigabitethernet 2/47 vlan id : 603 (MT), 100(T), 101(NU) Force10# VLAN Stacking in Multi-vendor Networks The first field in the VLAN tag is the Tag Protocol Identifier (TPID), which is two bytes. In a VLAN-stacking network, once the frame is double tagged, the outer tag TPID must match the TPID of the next-hop system. While 802.1Q requires that the inner tag TPID is 0x8100, it does not require a specific value for the outer tag TPID. Systems may use any two-byte value; FTOS uses 0x9100 (Figure 36-6) while non-Dell Force10 systems might use a different value. If the next-hop system's TPID does not match the outer-tag TPID of the incoming frame, the system drops the frame. For example, in Figure 36-6, the frame originating from Building A is tagged VLAN RED, and then double-tagged VLAN PURPLE on egress at R4. The TPID on the outer tag is 0x9100. R2's TPID must also be 0x9100, and it is, so R2 forwards the frame. Given the matching-TPID requirement, there are limitations when you employ Dell Force10 systems at network edges, at which, frames are either double tagged on ingress (R4) or the outer tag is removed on egress (R3). VLAN Stacking with E-Series TeraScale Systems The default TPID for the outer VLAN tag is 0x9100. Although the TPID field is 16 bits, E-Series TeraScale only uses the first eight to make forwarding decisions, and as such makes no distinction between 0x8100 and any other TPID beginning with 0x81, for example, 0x8181. You can configure the first eight bits of the TPID using the command vlan-stack protocol-type command. In Figure 36-6, the frame originating from Building C is tagged 0x9191 on egress of R1. R2's TPID is 0x9100, but it its an E-Series TeraScale system and makes no distinction between 0x9191 and 0x9100, so it forwards the frame. 652 | Service Provider Bridging
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