cisco switch trunk is not working

[n.bokhar1]

l have three cisco switches a 3850 core switch and two 2960x access switches

i have connected the both 2960x s to my 3850 via gbic-t ports

and i have configured a few vlans on my core switch with below configurations :

-----------------------------------------------------------------------

ip routing

vtp mode off

spann mode rapidpvst

spann vlan 10-180 root primary

vlan 10

vlan 20

vlan 80

int vlan 10 

 ip add 10.1.1.1 255.255.255.0

int vlan 20 

 ip add 10.1.2.1 255.255.255.0

int vlan 80

 ip add 10.1.8.1 255.255.255.0

int gig 1/0/6

 sw mode trunk

 sw trunk native vlan 80

 sw trunk allowed vlan 10-80

------------------------------------------------------------------------------------

and configure boath my 2960s like this:

------------------------------------------------------------------------------------

vtp mode off

spann mode rapidpvst

vlan 10

vlan 20

vlan 80

int vlan 1

 shut

int vlan 80

 ip add 10.1.8.2&3 255.255.255.0

int gig 1/0/1

 sw mode trunk

 sw trunk native vlan 80

 sw trunk allowed vlan 10-80

---------------------------------------------------------------------------

but when i have ping only on one of the  switches to 10.1.8.1 the other one is not working

and i don't know what the hell is going on please help me

what did i do wrong ???

[chrihussey]

Not much to go on here, can you post the following information from the switch you cannot ping:

show interface g1/0/1 trunk

show interface g1/0/1 status

show spanning-tree root

show arp

sh int vlan714 status

show ip interface vlan 80

If you could also post from the 3850 core:

show interface trunk

show spanning-tree root

show arp

show mac address-table interface g1/0/6 (or whatever is going to the unpingable switch)

Can the two 2960s ping each other?

Thanks

[Julio E. Moisa]

Hi

I think your 3 Cisco 3850 are in stack, and you have like a triangle with the 2960X, right?

                    Cisco 3850 Stack

                     /                      \

       Cisco 2960X   ----- Cisco 2960X

You could execute show ip int brief  and see if the interface vlan 80 is UP UP on the 3 switches. Probably the VLAN 80 is not applied or passing through.