Reference Guide

898 | Service Provider Bridging
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Figure 49-5. First-byte TPID Match on the E-Series ExaScale
Table 49-1, "E-Series Behaviors for Mis-matched TPID," in Service Provider Bridging details the outcome
of matched and mis-matched TPIDs in a VLAN-stacking network with the E-Series.
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.
Table 49-1. E-Series Behaviors for Mis-matched TPID
Network
Position
Incoming
Packet TPID
System
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
0xUVWX 0xUVYZ 1st-byte match switch as 0xUVYZ drop
0x81WX 0x81YZ 1st-byte match switch as is (no
decapsulation)
drop
0xUVWZ 0xQRST mismatch drop drop
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
L
E
VLAN G
REEN
V
LAN
PU
RP
L
E
VL
AN
BLUE
VLAN RED
V
LAN R
E
D
VL
A
N
BLU
E
R2-E-Series ExaScale
TPID: 0x9100
R1-E-Series TeraScale
TPID: 0x9191
TPID 0x9191
X
Building C
Building D