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QoS Problem - Outbound Ethernet Marcation

Hi all,

I have a problem with QoS.

Everytime a voice packet go outbound through an Ethernet interface the router remove the DSCP marcation 46 (EF) and marks as 0. Serial interfaces work fine.

I've tried with different IOS versions but the problem is the same.

If anyone has faced this problem before, please let'me know what IOS version this QoS configuration work.

Cheers ///

Neirival de Sousa (Brazil/Angola)

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Accepted Solutions

Re: QoS Problem - Outbound Ethernet Marcation

Hi,

can yo be more specific about your hardware/software and general setup?

Also one more thing: are you sure it happens outbound? Could it be that a LAN switch is receiving the frame/IP packet and the default port settings for Catalysts kick in? QoS wise all LAN ports on the Catalyst switches are untrusted, thus any marking will be set to 0 (best effort), when received on such a port. You need to issue a "mls trust ..." command on each port, where markings should be passed unchanged. The "..." is "cos" or "dscp" and depends on hardware/IOS.

Hope this helps! Please rate all posts.

Regards, Martin

2 REPLIES

Re: QoS Problem - Outbound Ethernet Marcation

Hi,

can yo be more specific about your hardware/software and general setup?

Also one more thing: are you sure it happens outbound? Could it be that a LAN switch is receiving the frame/IP packet and the default port settings for Catalysts kick in? QoS wise all LAN ports on the Catalyst switches are untrusted, thus any marking will be set to 0 (best effort), when received on such a port. You need to issue a "mls trust ..." command on each port, where markings should be passed unchanged. The "..." is "cos" or "dscp" and depends on hardware/IOS.

Hope this helps! Please rate all posts.

Regards, Martin

New Member

Re: QoS Problem - Outbound Ethernet Marcation

Hi Martin,

You are the man !!!

The router connection was through a Port-Channel and I'd configured qos just on the physical switch ports, not on the virtual Port-Channel. That was just insert on the Channel interface the command # qos trust dscp and everything working fine now.

Thank you very much.

Neirival (Brazil/Angola)

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