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тАО11-09-2006 12:08 PM
тАО11-09-2006 12:08 PM
Another quick question.
I have a 5400 at the core of my network. It is set as the default gateway for all vlans. ANything destined for the WAN is routed out to a cisco 2811 router.
THe cisco 2811 is currently plugged into an untagged port in a completely separate vlan. I did this to keep broadcast traffic away from the cisco 2811 wan router.
The 5400 has qos policies applied to vlans (for voice). I have been reading that the qos policies get dropped on untagged ports.
DOes this mean that I am currently losing my qos controls on the link between the 5400 switch and the 2811 router?
How should I best fix this?
Should I make the switch to router link a trunk?
Regards,
Rod.
Solved! Go to Solution.
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тАО11-09-2006 12:25 PM
тАО11-09-2006 12:25 PM
Re: qos on untagged switch ports
To prioritise traffic when not using tagging you need to use DSCP which inserts priority information into the IP packet itself.
You also need to configure mappings between 802.1p and DSCP for the prioritisation to work end to end. Fortunately this can be achieved on the 5400's - you will also need to configure the 2811 to recognise this traffic and put it in a low latency queue.
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тАО11-09-2006 01:57 PM
тАО11-09-2006 01:57 PM
Re: qos on untagged switch ports
I have the following in the switch config at the moment (irrelevant details removed):
qos dscp-map 101100 name "VOICE"
qos dscp-map 101100 priority 6
qos type-of-service diff-services
vlan 1
name "DEFAULT_VLAN"
exit
vlan 144
name "VOICE"
qos priority 6
voice
vlan 141
name "WAN"
exit
vlan 148
name "DATA"
qos priority 0
exit
Is this all that is needed? Does the QoS DCSP map work both ways (ie when entering the switch DSCP-->802.1p and when leaving the switch 802.1p --> DSCP)?
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тАО11-09-2006 02:42 PM
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тАО11-09-2006 02:53 PM
тАО11-09-2006 02:53 PM
Re: qos on untagged switch ports
At the moment I am identifying traffic for LLQ by port numbers, but being able to identify by DSCP as well will go a long way.
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тАО01-15-2007 02:00 AM
тАО01-15-2007 02:00 AM
Re: qos on untagged switch ports
Since he already has the mapping between 101100 and priority 6, could he just use "vlan 144 qos dscp 101100" and remove the priority 6 command?
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тАО01-15-2007 09:49 AM
тАО01-15-2007 09:49 AM