Dell Force10 C150 Configuration Manual page 959

Ftos configuration guide ftos 8.4.2.7 e-series terascale, c-series, s-series (s50/s25)
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Figure 46-8. First-byte TPID Match on the E-Series ExaScale
R1-E-Series TeraScale
TPID: 0x9191
Building C
Table 46-1
details the outcome of matched and mis-matched TPIDs in a VLAN-stacking network with the
E-Series.
Table 46-1. E-Series Behaviors for Mis-matched TPID
Network
Incoming
Position
Packet TPID
Core
0xUVWX
0xUVWZ
Egress Access
0xUVWX
Point
0x81WX
0xUVWZ
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
shown in
Figure
TPID 0x9191
X
R2-E-Series ExaScale
TPID: 0x9100
System
TPID
0xUVYZ
0xQRST
0xUVYZ
0x81YZ
0xQRST
Figure
46-9. Versions 8.2.1.0 and later differentiate between 0x9100 and 0x91XY, as
46-11.
Match Type
TeraScale Behavior
1st-byte match
switch as 0xUVYZ
mismatch
drop
1st-byte match
switch as 0xUVYZ
1st-byte match
switch as is (no
decapsulation)
mismatch
drop
Building D
ExaScale Behavior
drop
drop
drop
drop
drop
Service Provider Bridging | 959

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