4

enter image description here

This is driving me nuts. There are 2 vlans on the switch( vlan 20 and 21.) one trunking port g0/1 and thats connected to a Router On A Stick. I CANT PING DIVINCES ON SEPARATE VLANS NOR THE ROUTER FROM THE PCs. HELP!!!!!

Interface configuration on the switch:

interface FastEthernet0/1
 switchport access vlan 21
 switchport mode access
 switchport nonegotiate
 spanning-tree portfast
!
interface FastEthernet0/2
 switchport access vlan 21
 switchport mode access
 switchport nonegotiate
 spanning-tree portfast
!
interface FastEthernet0/3
 switchport access vlan 20
 switchport mode access
 switchport nonegotiate
 spanning-tree portfast
!
interface FastEthernet0/4
 switchport access vlan 20
 switchport mode access
 switchport nonegotiate
 spanning-tree portfast


!
interface FastEthernet0/5
!
interface FastEthernet0/6
!
interface FastEthernet0/7
!
interface FastEthernet0/8
!
interface FastEthernet0/9
!
interface FastEthernet0/10
!
interface FastEthernet0/11
!
interface FastEthernet0/12
!
interface FastEthernet0/13
!
interface FastEthernet0/14
!
interface FastEthernet0/15
!
interface FastEthernet0/16
!
interface FastEthernet0/17
!
interface FastEthernet0/18
!
interface FastEthernet0/19
!
interface FastEthernet0/20
!
interface FastEthernet0/21
!
interface FastEthernet0/22
!
interface FastEthernet0/23
!
interface FastEthernet0/24
!
interface GigabitEthernet0/1
 switchport trunk allowed vlan 20-21
 switchport trunk encapsulation dot1q
!
interface GigabitEthernet0/2
!

Note the interface connecting switch to router( the one on the switch is gig 0/1)

configuration on router interface g0/0 as its the one connecting to the switch below

interface GigabitEthernet0/0
 no ip address
 duplex auto
 speed auto
!
interface GigabitEthernet0/0.20
 encapsulation dot1Q 20
 ip address 150.19.20.6 255.255.255.248
!
interface GigabitEthernet0/0.21
 encapsulation dot1Q 21
 ip address 150.19.21.6 255.255.255.248
!
Improve this question
2
  • If you can't even ping the router the VLANs are not set up correctly. You need to configure the VLAN trunk in exactly the same way on both sides.
    – Zac67 ♦
    Commented Apr 17, 2018 at 8:50
  • i swear i have... let me try to post the configuration on the switch
    – Frankline
    Commented Apr 17, 2018 at 8:57

2 Answers 2

Reset to default
2

I don't see where you have globally defined the VLANs on the switch. You need something like:

Vlan 20
 name VLAN_20   ! or whatever you want to name it
 exit
!
Vlan 21
 name VLAN_21   ! or whatever you want to name it
 exit
!
Improve this answer
0
0

On the switch, add the following

interface GigabitEthernet0/1

switchport mode trunk

And then run show interface trunk to verify Trunk is setup properly on the Switch.

Improve this answer

Not the answer you're looking for? Browse other questions tagged or ask your own question.