KB.15.15

Marks an 802.1p priority in outbound packets with the specified IP address or

subnet mask in the source or destination field in a packet header, where:

• ipv4-address or ipv6-address is an IPv4 or IPv6 address used to match

the source or destination address in packet headers.

NOTE: An IPv6 local-link address (such as fe80::110:252%vlan20) that

is automatically generated on a VLAN interface is not supported as an

ipv6-address value.

• [ipv4] ipv4-address/mask-length is the subnet identified by the IPv4

mask for the specified address that is used to match the IPv4 in the source or

destination field of packet headers.

• ipv6 ipv6-address/prefix-length is the subnet identified by the IPv6

prefix-length for the specified address that is used to match the IPv6 address

in the source or destination field of packet headers.

Enter the IPv4 mask or IPv6 prefix length with an address in CIDR format by

using the number of significant bits (for example,

2001:db8::1:262:a03:e102:127/64 or 10.28.31.1/24).

• priority 0 - 7 marks the specified 802.1p priority in matching IP packets.

The 802.1p priority determines the packet's queue in the outbound port on

the switch. If the packet leaves the switch on a tagged VLAN port, it carries

the 802.1p priority with it to the next downstream device.

The no form of the command deletes the specified IP address or subnet mask

as a QoS classifier, and resets the priority for the VLAN to No-override.

show qos device-priority

Displays a listing of all IP device-priority QoS configurations currently in the

running-config file.

198 Quality of Service: Managing bandwidth effectively