Hi all
Thanks for your responses. I guess I would be safe to say that because each vlan is an independent broadcast domain we can effectively use the same mac address on different vlans without fear of overlapping. Thanks. Wilson F. Tuma ==================================== Box 1784 Douala Cell : +237 77 11 74 77 Email : [email protected] ==================================== ________________________________ From: Scott Furman <[email protected]> To: Wilson Tuma <[email protected]> Cc: RS Ipexpert. <[email protected]> Sent: Monday, July 15, 2013 5:00 AM Subject: Re: [OSL | CCIE_RS] Mac Address on Main/Sub-interface Question. Hi Wilson, As soon as the router's physical interface sees its MAC address in the header of the frame, it strips the layer 2 encapsulation (thereby terminating the VLAN), so there's no need for unique MACs on each subinterface - it'd only waste resources. The router then forwards the layer 3 packet to the outgoing (sub)interface… Hope that helps! Best, Scott On Jul 14, 2013, at 2:31 PM, Wilson Tuma wrote: > Hi Guys > > > From the output below is is apparent that sub-interface inherit the mac > address of the parent. > > Why? Shouldn't the mac address be unique for each sub interface? > > > > > R6(config)#do sh ip int brief | in FastEthernet0/0 > FastEthernet0/0 unassigned YES manual up > FastEthernet0/0.67 155.5.67.6 YES manual up > FastEthernet0/0.111 1.1.1.1 YES manual up > FastEthernet0/0.146 155.5.146.6 YES manual up > > > > > R6(config)# > R6(config)#do sh ip int brief | in bia > R6(config)#do sh int fa 0/0 | in bia > Hardware is Gt96k FE, address is 001b.d5ac.5d9a (bia 001b.d5ac.5d9a) > > R6(config)#do sh int fa 0/0.67 | in bia > Hardware is Gt96k FE, address is 001b.d5ac.5d9a (bia 001b.d5ac.5d9a) > > R6(config)#do sh int fa 0/0.146 | in bia > Hardware is Gt96k FE, address is 001b.d5ac.5d9a (bia 001b.d5ac.5d9a) > > R6(config)#do sh int fa 0/0.111 | in bia > Hardware is Gt96k FE, address is 001b.d5ac.5d9a (bia 001b.d5ac.5d9a) > > > > Thanks. > > Wilson F. Tuma > ==================================== > > > Box 1784 Douala > Cell : +237 77 11 74 77 > Email : [email protected] > ==================================== > _______________________________________________ > 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
