DELL S50V User Manual
Service Provider Bridging | 959
Figure 46-8. First-byte TPID Match on the E-Series ExaScale
details the outcome of matched and mis-matched TPIDs in a VLAN-stacking network with the
E-Series.
VLAN Stacking with C-Series and S-Series
The default TPID for the outer VLAN tag is 0x9100. Beginning with FTOS version 8.2.1.0, both the
C-Series and S-Series allow 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
C-Series and S-Series allow 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
. Versions 8.2.1.0 and later differentiate between 0x9100 and 0x91XY, as
shown in
Table 46-1. E-Series Behaviors for Mis-matched TPID
Network
Position
Position
Incoming
Packet TPID
Packet TPID
System
TPID
TPID
Match Type
TeraScale Behavior
ExaScale Behavior
Core
0xUVWX
0xUVYZ
1st-byte match
switch as 0xUVYZ
drop
0xUVWZ
0xQRST
mismatch
drop
drop
Egress Access
Point
Point
0xUVWX
0xUVYZ
1st-byte match
switch as 0xUVYZ
drop
0x81WX
0x81YZ
1st-byte match
switch as is (no
decapsulation)
decapsulation)
drop
0xUVWZ
0xQRST
mismatch
drop
drop
IN
T
ER
N
ET
SE
RV
ICE P
ROVIDER
VLAN GREEN
,
VLAN PURPLE
VLAN GREEN
VLAN
PU
RP
LE
VLAN
BLU
E
VLAN
RED
V
LAN
R
ED
VL
A
N
BL
U
E
R2-E-Series ExaScale
TPID: 0x9100
R1-E-Series TeraScale
TPID: 0x9191
TPID 0x9191
X
Building C
Building D