02-28-2007 01:14 PM - edited 03-05-2019 02:38 PM
This is on a 6509/Sup720 IOS 12.2(18)SXF5 and 12.2(18)SXE, and a WS-X6548-GE-TX and a WS-X6724-SFP blade.
I'm trying to create two sub-interfaces on each port, tag one for a data vlan and one for a voice vlan. Each port will then connect to a 3750 switch where IP phones and PC's will be connected to the same port. This is the typical IP phone/PC architecture. I was hoping to use the same vlan numbers on each switch so we don't have to keep track of which vlan is which switch - this works in the layer 2 world because the vlan stops at the layer 3 router port.
Well on the 6509 port this is what I have for the first port:
interface GigabitEthernet2/14
description to SW-232.15
no ip address
no ip route-cache
speed 1000
duplex full
mls qos trust dscp
spanning-tree portfast
!
interface GigabitEthernet2/14.10
encapsulation dot1Q 10
ip address 162.*.*.1 255.255.255.128 (the data vlan)
no ip route-cache
!
interface GigabitEthernet2/14.910 (the voice vlan)
encapsulation dot1Q 910
ip address 172.*.*.1 255.255.255.128
no ip route-cache
Now when I go to the next interface and do the same thing this is the error msg I get:
ENGLAB-6513-Native(config-if)#int g2/16.10
ENGLAB-6513-Native(config-subif)#encapsulation dot1Q 10
Command rejected: VLAN 10 not available
I can put some other dot1q tag on here but not 10 which I've already used.
Aren't these dot1q tags used only between the interface and the layer 2 switch connected to it? Aren't the tags stripped off when packets switch from one interface to another?
If so shouldn't I be able to use the same dot1q tag on different sub-interfaces?
Or am I not understanding things correctly?
02-28-2007 01:52 PM
I have set up 3750s connecting to 6509s with IPT before & usually Dot1q trunk to the 3750 with the 6509 as a VTP server & the 3750s are VTP clients. Then on the 3750 ports, use the following:
switchport access vlan 10
switchport voice vlan 910
Here's a sample from one of my old production configs:
6509 Vlans:
!
interface Vlan103
description 3rd floor
ip address 10.0.x.x 255.255.248.0
ip helper-address 10.x.x.x
ip helper-address 10.x.x.x
no ip redirects
ip route-cache flow
end
!
!
interface Vlan186
description 3rd Floor VOICE
ip address 10.x.x.2 255.255.254.0
ip helper-address 10.x.x.x
ip helper-address 10.x.x.x
no ip redirects
ip route-cache flow
no ip route-cache cef
end
6509 to 3750:
(6509 port)
!
interface GigabitEthernet3/7
description UPLINK.TO.CLOSET.3C - G1/0/1
switchport
switchport access vlan 999
switchport trunk encapsulation dot1q
switchport trunk native vlan 999
switchport mode trunk
spanning-tree link-type point-to-point
spanning-tree port-priority 32
end
(3750 port)
!
interface GigabitEthernet1/0/1
description UPLINK.TO.6509-1 - G3/7
switchport trunk encapsulation dot1q
switchport trunk native vlan 999
switchport mode trunk
srr-queue bandwidth share 10 10 60 20
srr-queue bandwidth shape 10 0 0 0
queue-set 2
mls qos trust cos
auto qos voip trust
end
All other 3750 ports:
!
interface FastEthernetx/x/x
switchport access vlan 103
switchport voice vlan 186
srr-queue bandwidth share 10 10 60 20
srr-queue bandwidth shape 10 0 0 0
mls qos trust cos
auto qos voip trust
spanning-tree portfast
!
LMK if this helps.
03-01-2007 07:15 AM
Thanks for the information - I'll give it a try and let you know how it works for me.
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