07-14-2009 08:29 AM - edited 03-15-2019 06:58 PM
Hi.
I have 2 switches, 2 vlans/switch, vlan 10 (voice vlan) vlan 20 (data vlan) , 1 MCS with CUCM 7.0.
I want to configure trunking between 2 switches but keep the qos of voice vlan.
This is my interface gigabitethernet 0/1 configuration.
interface gigabitethernet 0/1
switchport mode acces
swtchport acces vlan 20
switchport voice vlan 10
spanning-tree portfast
How i configure gigabitethernet 0/24 to trunk voice and data vlan and keep the qos of voice vlan.
Thanks.
07-14-2009 01:57 PM
on the tunk link between the tow switches
int gig0/5
switchport trunk encapsulation dot1q
switchport mode trunk
mls qos trust dscp
this on both side of the switches
also make sure that cos 5 map to dscp 46]by issuing show mls map cos-dscp
this will preserve the qos marking is tat wha you looking for
my question here if you have only tow switches i think qos not an issue unless you have remote sites over a WAN link
anyway good luck
HTH
07-15-2009 07:36 AM
I have more switches, more locations, but all in a campus switched network.In this moment i don't have voip over WAN link.
commands - show mls map cos-dscp - map cos 5 to dscp 40?it's ok?
thanks.
07-15-2009 02:26 PM
no it has to to be 46
enter the following command it will fix it to u
mls qos map cos-dscp 0 8 16 24 32 46 48 56
by the way al these config to keep the marking
if you want some sort of prioritization tell me what switches model you are usig and i will try to send you some commands to help in this
good luck
07-16-2009 07:10 AM
I have catatalyst 2960 and catalyst 3750.
Thank you.
05-04-2018 07:33 AM
Hi,
I have a link from our Cisco core switch to another Cisco switch, both sides marked with a vlan tag, this works fine. I can ping and connect to my server on this subnet.
The trouble is, the moment I add another link with the same vlan tag (I want to load balance/ have redundancy), the server drops off the face of the earth.
I have tried creating an etherchannel and adding the 2 ports to it, but this doesn't seem to work either.
Thanks
07-20-2009 02:42 AM
On the port connecting to the Cisco IP Phone, try the Cisco macro/command "auto qos voip cisco-phone".
On the 802.1Q trunk use the "auto qos voip trust".
This is usually enough to provide QoS for Cisco IP Phone voice traffic.
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