05-14-2003 11:04 PM - edited 03-12-2019 11:53 PM
I have 2950 switches with one data vlan 20 and one voice vlan 200. Data is on 192.168.20.0/24 and non-cisco IP phones on
192.168.200.0/24 subnets. The 6509 is a doing an InterVlan routing.
Some of the phones will have PC connected to it and some won't. For minimizing adminstrative issues, I have enable all ports in this
fashion to carry both voice and data VLANS. Is it the write approach?
For example, Port 1 48 on 2950 have this configuration,
int fastethernet 0/1
switchport mode access ---> making port an access port
switchport access vlan 10 ---> assign port to data vlan 10 and carry data traffic
switchport voice vlan 200 ----> to carry voice traffic
switchport priority extend cos 5 -----> prioritize voice traffic
Please tell me if this is the right approach to efficiently carry both voice/data traffic. Voice with high priority.
Am I gonna need any QOS service configured on 6500 switch?
Regards,
05-16-2003 12:45 AM
Hello,
You did the wrong configuration for carring voice an data on different vlan.
It should be like that:
int fastethernet 0/1
switchport mode trunk ---> making a trunk connection
switchport trun encapsulation dot1q ---> dot1q trunk between phone an switch
switchport voice vlan 200 ----> to carry voice traffic
swithcport trunk native vlan 20 ----> to specify the data vlan for PC connected to the IP phone
switchport priority extend cos 5 -----> prioritize voice traffic
Management vlan is still vlan1.
Best regards,
Aleksander Kocelj
05-16-2003 10:28 AM
Thanks ! I will make the change as you mentioned. I tested by plugging my PC to the Phone, and Phone to the Switch, and I am able to route both data and traffic with my configuration. Was it not supposed to work it all the way I did it?
2) Do I need to do any QOS on my 6509 switch as well?
Please shed some lights.
Thanks
05-24-2003 08:00 AM
Yep. You do need it everywhere on your voip network.
One more remark about your config:
switchport priority extend cos 5
This command does not change voice prio. It sets the DATA traffic of a PC attached to the phone-switchport to COS 5.
Set this value to 0 or to trust. What you do with cos 5 is giving data traffic the same cos as voice traffic!!!!!
09-25-2004 06:36 AM
You don't actually need all the Trunking configuration on the switchports - it will work without it:
Interface FastEthernet0/1
switchport mode access
switchport access vlan 20
switchport voice vlan 200
mls qos trust cos/dscp
This configuration makes the port a 'psuedo trunk' it is the equivilent of the config:
Interface FastEthernet0/1
switchport mode trunk
switchport trunk encapsulation dot1q
switchport native vlan 20
switchport trunk allowed vlan 20,200
mls qos trust cos/dscp
!
With the 2950 you can only trust DSCP if you run the EI image, also the 2950 can only 'see' and write certain DSCP values:
0 8 10 16 18 24 26 32 34 40 46 48 56
Depending on your IP Phones you can trust the CoS/DSCP received or reset it with a Serive-Policy.
Andy
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