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C H A P T E R 10 Quality of Service (QoS)
151
Configuring DiffServ
Contained in the header of every IP packet is a field for IP Type of
Service (TOS), also referred to as the DiffServ field. The DiffServ
or TOS field is used by the switch to determine the type of service
provided to the packet. Figure 10.2 shows the encapsulation of an
IP packet header.
Figure 10.2: IP packet header encapsulation
disable dot1p replacement ports [<portlist>
| all]
Disables the ability to overwrite 802.1p priority
values for a given set of ports.
enable dot1p replacement ports [<portlist> |
all]
Enables the 802.1p priority field to be
overwritten on egress according to the QoS
profile to 802.1p priority mapping for a given
set of ports.
show dot1p Displays the 802.1p-to-QoS profile mappings.
Table 10.8: 802.1p Configuration Commands (continued)
Command Description
Type-of-service
DiffServ code point
IHL
Data (variable)
0 bits 31
Options (+ padding)
Destination address
Source address
07654321
Total lengthVersion
ProtocolTime-to-live
Header checksum
FlagsIdentification Fragment offset