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598 PowerConnect B-Series FCX Configuration Guide
53-1002266-01
802.1p priority override
17
Buffer allocation/threshold for QoS queues
By default, Dell Ironware software allocates a certain number of buffers to the outbound transport
queue for each port based on QoS priority. The buffers control the total number of packets
permitted in the outbound queue for the port. If desired, you can increase or decrease the
maximum number of outbound transmit buffers allocated to all QoS queues, or to specific QoS
queues on a port or group of ports. For more information, refer to “TDynamic Buffer Allocation for
an IronStack” on page 326.
802.1p priority override
You can configure a port to ignore the 802.1p priority for traffic classification for an incoming
packet. When this feature is enabled, packets will be classified as follows:
• If the packet matches an ACL that defines the priority, then ACL priority will be used.
• If the packet source or destination MAC address matches a configured static MAC address with
priority, then static MAC priority will be used.
• If the ingress port has a configured priority, then port priority will be used.
• Otherwise, the configured or default port priority (0) will be used.
Note that the original 802.1p priority in the packet will be retained. This feature does not re-mark
the 802.1p value.
Configuration notes and feature limitations
• This feature is supported on physical ports and trunk ports. When applied to the primary port
of a trunk group, the configuration applies to all members of the trunk group.
• This feature is not supported together with trust dscp.
Enabling 802.1p priority override
To enable 802.1p priority override, enter the following command at the interface level of the CLI.
PowerConnect(config-if-e1000-2)#priority ignore-8021p
Syntax: [no] priority ignore-802.1p
Use the following command to show whether 802.1p priority override is enabled on a port.
Syntax: show run interface ethernet <port>
Specify the <port> variable in the following formats:
• PowerConnect B-Series FCX stackable switches – <stack-unit/slotnum/portnum>
PowerConnect#show run interface ethernet 1
interface ethernet 1
priority ignore-8021p