VTP, Portfast, Spanning Tree and all the other switch related stuff.
How about the VLAN interface IP addresses in the switch.Try to put into the switch the following and tell me if it works and you can ping the VLAN interface in the switch to the router and vice versaSwitch:Int vlan99ip address 18.104.22.168 255.255.255.0Int vlan199ip address 192.168.1.101 255.255.255.0Regards
Hello Anacleto,with this config:interface FastEthernet0/3description CONNECTION TO ROUTERswitchport trunk encapsulation dot1qswitchport mode trunkmls qos trust dscp! you have a native vlan mismatch because a command here is missing to say that vlan 12 and not vlan 1 is the native vlanaddint f0/3switchport trunk native vlan 12seeRouter(config-if)# switchport trunk native vlan vlan_IDhttp://www.cisco.com/en/US/docs/switches/lan/c ... 020628Hope to helpGiuseppe
Hello Anacleto,nice to hear that you solved the issue.native vlan mismatch is the first item to verify when you experience L3 problems on only some subinterfaces.If you like you can rate the post and click on the solved flag to indicate that the story had an happy endBest RegardsGiuseppe