3850 trunking

Jeff Horton · ‎09-20-2016

I am trying to create a trunk link from a Cisco 3750x to a 3850. Just trying to connect the copper ports together... I have the following on each port:

3750x:

switchport trunk encapsulation dot1q

switchport trunk native vlan 5

switchport trunk allowed vlan 2-4094

switchport mode trunk

switchport nonegotiate

3850:

switchport trunk native vlan 5

switchport trunk allowed vlan 2-4094

switchport mode trunk

switchport nonegotiate

Both interfaces are showing up, 3750x shows an output rate but not an input rate. Vice versa on 3850.

vtp version is 2

vtp password is set

I tried creating a port-channel and trunking that way but that would not work either. Port on 3850 said up and down (suspended).. I have checked speed and they are same...

Any idea?

Jeff

Reza Sharifi · ‎09-20-2016

What VTP mode the switches are in?

Have you tried using VTP transparent mode?

HTH

Jeff Horton · ‎09-21-2016

Both are in client mode.. My switch that is in server mode is connected to the 3750...

Jeff

Mark Malone · ‎09-21-2016

Are the vlans also created at layer 2 on each switch ? show vlan each side make sure there populated correctly

vlan 10

name xxx

can you post show int trunk from each side

and also make sure stp is forwarding both trunks fully

show spanning-tree interface x

Also check are the ports are dot1q (they should be from your config)---show interface x/x switchport

Jeff Horton · ‎09-21-2016

I see now what is happening.. The C3850 is seeing native vlan 1 on trunk port even though the configuration has vlan 5.. The 3750x is also seeing native vlan 1 coming from C3850. Don't understand why this is happening.

Also just saw this error on switch log:

%FED_PM_ERRMSG-3-HW_ERROR

Saw where this was a bug (CSCul30426) at one time. Currently running 3.6.5E IOS XE..

Spanning tree is showing fwd on c3850 and 3750x for those ports.

C3850:

INFR-NET-SWC11#sh int trunk

Port Mode Encapsulation Status Native vlan
Gi1/0/48 on 802.1q trunking 5

Port Vlans allowed on trunk
Gi1/0/48 2-4094

Port Vlans allowed and active in management domain
Gi1/0/48 none

Port Vlans in spanning tree forwarding state and not pruned
Gi1/0/48 none

3750X:

INFR-NET-SWC13# sh int trunk

Port Mode Encapsulation Status Native vlan
Gi1/0/48 on 802.1q trunking 5

Port Vlans allowed on trunk
Gi1/0/48 2-4094

Port Vlans allowed and active in management domain
Gi1/0/48 2-3,5,8,12,16,20-27,30-31,36,40-41,44-45,60-65,67,100-101,116,120,208-209,212-214,311,400-401,410,412,500-502,510,512-519,601,603-604,700-701,800-811,900-909,911,950-958,960-969,998-1000

Port Vlans in spanning tree forwarding state and not pruned
Gi1/0/48 2-3,5,8,12,16,20-27,30-31,36,40-41,44-45,60-65,67,100-101,116,120,208-209,212-214,311,400-401,410,412,500-502,510,512-519,601,603-604,700-701,800-811,900-909,911,950-958,960-969,998-1000

Jeff

Jeff Horton · ‎09-22-2016

I have gotten the trunk link to work by configuring the management vlan on the 3850 switch. This allows me to communicate to the 3850. VTP is still not working across the link though. I do not have the vlans that are suppose to be reciprocated. VTP is configured as a Client, domain is configured, version 2 is running and vtp password is set.

Any ideas?

Jeff