Sean, The interface on the switch needs to be configured as an 802.1q trunk in order for this to work. Have you verified that the switch port is trunking? It sounds like you have it configured as an access port. Also, as routers don't run DTP, you will have to manually set the switch port in trunk mode.
Kind regards, Chad Uretsky >________________________________ > From: Sean James Gealon <[email protected]> >To: IPExpert Online <[email protected]> >Sent: Thursday, June 21, 2012 10:10 AM >Subject: [OSL | CCIE_RS] Sub-interface problem > >Hi, > > I just want to ask if anyone had experience on Fastethernet sub-interface >problem? > > I have fa0/0 which has a configuration of: > > interface FastEthernet0/0 > no ip address > duplex auto > speed auto >! >interface FastEthernet0/0.77 > encapsulation dot1Q 77 > ip address 20.1.1.1 255.255.255.0 >! >interface FastEthernet0/0.120 > encapsulation dot1Q 120 > ip address 10.1.1.1 255.255.255.0 > > ---------------- > >Router(config)#do sh ip int br >Interface IP-Address OK? Method Status >Protocol >FastEthernet0/0 unassigned YES TFTP up up > >FastEthernet0/0.77 20.1.1.1 YES NVRAM up up > >FastEthernet0/0.120 10.1.1.1 YES manual up >up > > >As you can see on the output everything is running fine, interfaces are up. >Now on the fa0/0.120 (10.1.1.1) it is connected to a switch f0/1. >on the switch also it is configured with vlan 99 with ip address of 10.1.1.2 > >when I try to ping from router to switch using the fa0/0.120 (10.1.1.1) the >output is down. >but when I configure the ip address 10.1.1.1 of the router into the f0/0 >interface (not the sub-interface) >the ping is successful. > > > Any advice? >_______________________________________________ >For more information regarding industry leading CCIE Lab training, please >visit www.ipexpert.com > >Are you a CCNP or CCIE and looking for a job? Check out >www.PlatinumPlacement.com > >http://onlinestudylist.com/mailman/listinfo/ccie_rs > > > _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com http://onlinestudylist.com/mailman/listinfo/ccie_rs
