Hi, Guys I am reading the PowerPoint of cisco "Introducing of OSPF Protocol" and run into a small question about the spf calculation section: what's the meaning of the dotted line in the second graph below? Regards ... View more

Hi all,   Recently, I was implementing a project in the hospital.The  general enviroment is that one Core SW connected with  three Distribution SWs, running ospf between all（The three Distribution SWs are used for  3 different departments so they need to be logical isolated）   Now we want to add a 5760 WLC which connected to the Core SW,and add  APs  connected to the three different Distribution SWs（therefore I have created three different AP-Management VLANs  on the three Distribution SWs and configured different DHCP pools using the op 43 which point to the Managament IP of the 5760 WLC）.   Now I was wondering if the 5760 supports different ap-management subnets like the older WLCs？If not ,should I use  the multicast  feature  to implement this？   By the way,the wireless clients  could be in one subnet or in 3 different subnets，but finally they must be capable to communicated  with the server farm behind the  Core SW. ... View more

Recently, I was implementing a project in the dock.The environment r oughly like this:      1.there was a fiber link connected 2 LAN  between the 6509 and the 3750X before      2.now we want to add a wireless link (using two 1532E APs) to bridge 2 LAN (to transfer several vlans)   The topology like below: 6509:Root Switch      3750:STP Non-Root Switch AP(left):Root Bridge       AP(right):Non-Root Bridge Now,I was wondering if  the 2 APs should be seen as transparent or be seen as 2 switches when the wireless link has been established.   Below are 2 doubts I have now:    1.when I regard the 2 APs as transparent , why the port  that 3750X connected to the AP(right) has been selected as a  designated port but not a non designated one    2.when I regard them as 2 switches , why the cost from the 3750X to the 6509  hasn't been cumulatived while the BPDU transfer from the 6509  to the 3750X through the 2 aps   Note：I have configured the command "bridge * protocal ieee" for every bridge group which a ssociated to every vlan on both the 2 APs. By the way,what is the differance between the command "bridge * protocal ieee" and the command "bridge * protocal vlan-bridge"? ... View more