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Figure 46-7. TPID Mismatch and 0x8100 Match on the E-Series TeraScale
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 Figure 46-6, R2 forwards the frame with TPID 0x9191 which originated from Building
C. In contrast, R2 drops the frame with TPID 0x9191 originating from Building C in Figure 46-8 because
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.
I
N
T
E
R
N
E
T
S
E
R
V
I
C
E
P
R
O
V
I
D
E
R
VL
AN GREE
N
, VLAN PURP
LE
VLAN G
REEN
V
LAN PURP
L
E
VL
AN
BLUE
VLAN RED
V
LAN R
E
D
VL
A
N
BLU
E
TPID
(0x8100)
PCP
CFI
(0)
VID
(VLAN Red)
TPID
(0x8100)
PCP
CFI
(0)
VID
(VLAN Red)
TPID
(0x8100)
PCP
CFI
(0)
VID
(VLAN Purple)
R2-E-Series TeraScale
Building A
Building B
TPID: 0x8181
R3-E-Series TeraScale
TPID: 0x8181
R4-Non-Force10 System
TPID: 0x8100
R1-E-Series TeraScale
TPID: 0x9100
TPID 0x8100
X
X
TPID 0x9100
Building C
Building D