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priority trust
priority-trust
Syntax
priority-trust { cos | dscp | ip-precedence }
undo priority-trust
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Parameter
cos: Configures the switch to trust the CoS precedence (802.1p precedence) of the received packets.
dscp: Configures the switch to trust the DSCP precedence of the received packets.
ip-precedence: Configures the switch to trust the IP precedence of the received packets.
Description
Use the priority-trust command to specify the trusted packet priority type.
Use the undo priority-trust command to restore the default.
By default, a switch trusts the 802.1p priority of the received packets.
A port of an S3100 series switch can accommodate four output queues. The output queue to which a
received packet is to be added to is determined by its local precedence:
z DSCP precedence: Ranges from 0 to 63. By default, packets with DSCP values from 0 to 15 are
put into queue 0, those from 16 to 31 in queue 1, from 32 to 47 in queue 2, and from 48 to 63 in
queue 3.
z CoS priority: Ranges from 0 to 7. By default, packets with CoS priority level 1 or 2 are put into
queue 0, those with 0 or 3 in queue 1, with 4 or 5 in queue 2, and with 6 or 7 in queue 3.
z IP precedence: Ranges from 0 to 7. By default, packets with IP priority level 0 or 1 are put into
queue 0, those with 2 or 3 in queue 1, with 4 or 5 in queue 2, and with 6 or 7 in queue 3.
You can choose a queuing policy that best meets your needs.
Note that: on the S3100-EI series, before configuring a switch to trust the DSCP precedence of the
received packets with the priority-trust dscp command, configure the priority trust command on the
switch first.
The configuration of trusting the IP precedence of the received packets is not available on S3100-EI
series Ethernet switches.
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