[c-nsp] 3750 Stop Passing Traffic When "trust dscp" Enabled

Devon True devon at noved.org
Thu Aug 9 10:53:28 EDT 2012


We are running a 3750 on 12.2(52)SE which terminates a 1G connection
from a metro Ethernet provider so that we can aggregate customer
Ethernet circuits based on vlan id and split them out on individual 100M

When we enable "mls qos trust dscp" on a customer-facing interface, the
switch stops forwarding traffic to our metro Ethernet provider. Our only
resolution is to reload the switch to restore services. We have a Cisco
TAC case open but I was curious if anyone else has experienced this issue.

The command "mls qos trust dscp" is already enabled on the 1G interface
with no issues.

The customer-facing interface is a dot1q tunnel and "mls qos" is enabled


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