Dell Force10 S4810P Configuration Manual page 920

Figure 44-7. TPID Mismatch and 0x8100 Match on the E-Series TeraScale
Building C
VLAN Stacking with E-Series ExaScale Systems
E-Series ExaScale, beginning with FTOS version 8.2.1.0, allows you to configure both bytes of the 2-byte
TPID. TeraScale systems allow you to configure the first byte only and thus, the system did not
differentiate between TPIDs with a common first byte. For example 0x9100 and 0x91A8 were treated as
the same TPID. In
C. In contrast, R2 drops the frame with TPID 0x9191 originating from Building C in
the frames TPID does not match both bytes of its own TPID.
FTOS Behavior: The E-Series ExaScale and TeraScale forwards frames with TPID 0x8100 even when its own
TPID is not 0x8100. This behavior is required to service ARP and PVST packets, which use TPID 0x8100.
920
| Service Provider Bridging
TPID 0x9100
X
R2-E-Series TeraScale
TPID: 0x8181
R1-E-Series TeraScale
TPID: 0x9100
R4-Non-Force10 System
Figure 44-6, R2 forwards the frame with TPID 0x9191 which originated from Building
TPID 0x8100
R3-E-Series TeraScale
TPID: 0x8181
TPID PCP
(0x8100)
TPID: 0x8100
Building A
Building D
X
Building B
CFI VID TPID PCP
(0) (VLAN Purple) (0x8100)
TPID PCP
(0x8100)
Figure 44-8
CFI VID
(0) (VLAN Red)
CFI VID
(0) (VLAN Red)
because