Cisco 3850 transmit Queues

[rodger rau]

I am migrating from a 4500 to a stacked 3850 cluster.  I believe the qos dscp trust is automatic by default.. however, how do I enable and set transmit queues?  

my old switchport config:

qos trust dscp
tx-queue 1
bandwidth percent 60
tx-queue 2
bandwidth percent 5
tx-queue 3
bandwidth percent 30
priority high
shape percent 30
tx-queue 4
bandwidth percent 5

[Mark Malone]

those commands are specific to a 4500 chassis based unit based on the actual hardware for qos

they don't exist on a 3850 and yes that's correct in the 3850 the dscp values are trusted by default uoou can see that with command

#sh platform qos dscp-cos counters gigabitEthernet 1/0/1 | i DSCP46
Ingress DSCP46 1363289731    0
Egress DSCP46 1717556249    0

I would read these 2 docs to understand qos on a 3850 its different from 4500 and 3750s etc , its ios-xe using a slightly different architecture , when you enable qos trust dscp it will auto create policy and class maps based on the particular choice of auto qos used

have a look at this doc shows what gets configured for each different command

http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3850/software/release/3se/qos/configuration_guide/b_qos_3se_3850_cg/b_qos_3se_3850_cg_chapter_0100.html#reference_1F1A3B686CE64AACB5CC3B343D01B735

http://www.cisco.com/c/en/us/support/docs/switches/catalyst-3850-series-switches/118629-technote-qos-00.html