Exp Values - HP FlexNetwork MSR Series Configuration Manuals

Figure 31 An Ethernet frame with an 802.1Q tag header
Destination
Address
6 bytes
Figure 32 shows the format of the 802.1Q tag header. The Priority field in the 802.1Q tag header is
called 802.1p priority, because its use is defined in IEEE 802.1p.
802.1p priority.
Figure 32 802.1Q 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 12 Description on 802.1p priority
802.1p priority (decimal)
0
1
2
3
4
5
6
7

EXP values

As shown in
MPLS labels for MPLS QoS purposes.
Figure 33 MPLS label structure
802.1Q
header
Source
Address
TPID TCI
6 bytes 4 bytes
Byte 2
6 5 4 3 2 1 0
802.1p priority (binary)
000
001
010
011
100
101
110
111
Figure 33, the EXP field is 3-bit long and is in the range of 0 to 7. The EXP field is in
Length
Data
/Type
2 bytes 46~1500 bytes
Byte 3
TCI(Tag control information)
C
0 Priority F
I
7 6 5 4 3 2 1 0 7
117
FCS(CRC-
32)
4 bytes
Table 12 shows the values for
Byte 4
VLAN ID
6 5 4 3 2 1 0
Description
best-effort
background
spare
excellent-effort
controlled-load
video
voice
network-management