Exp Values - HP A6600 Configuration Manual

Figure 49 802.1Q tag header
Byte 1
TPID (Tag protocol identifier)
1 0 0 0 0 0 0 1 0 0 0 0 0 0 0
7 6 5 4 3 2 1 0 7
Table 8 Description on 802.1p priority
802.1p priority (decimal)
0
1
2
3
4
5
6
7

EXP values

The EXP field is in MPLS labels for MPLS QoS purposes.
Figure 50 MPLS label structure
0
As shown in Figure
Byte 2
0
6 5 4 3 2 1 0
802.1p priority (binary)
000
001
010
011
100
101
110
111
Label
50, the EXP field is 3 bits long and ranges from 0 to 7.
Byte 3
TCI (Tag control information)
CFI
Priority VLAN ID
7 6 5 4 3 2 1 0 7
19 22 23
Exp S TTL
140
Byte 4
6 5 4 3 2 1 0
Description
best-effort
background
spare
excellent-effort
controlled-load
video
voice
network-management
31