I thaught to suggest you this yesterday but forgot. Anyways as I mentioned yesterday routers always lack port density and also cost per port is more compared to switchports.
Getting 3 fiber port on router will be very costly and that was the reason suggested you to have main switch connected to router and then connect all switches to this main switch.
2821 router comes with two integrated 10/100/1000 ethernet ports not fiber interface so you may not get 3 10/100/100 ports even to connect to your 3 switches via 1 GIG link. So either you can integrate this router with some etherswitch module which has max 1 gig port so in all you will get 3 gig ports.
[toc:faq]The ProblemOn traditional switches whenever we have a trunk
interface we use the VLAN tag to demultiplex the VLANs. The switch needs
to determine which MAC Address table to look in for a forwarding
decision. To do this we require the switch to do...
[toc:faq]Introduction:Netdr is a tool available on a RSP720, Sup720 or
Sup32 that allows one to capture packets on the RP or SP inband. The
netdr command can be used to capture both Tx and Rx packets in the
software switching path. This is not a substitut...
IntroductionOSPF, being a link-state protocol, allows for every router
in the network to know of every link and OSPF speaker in the entire
network. From this picture each router independently runs the Shortest
Path First (SPF) algorithm to determine the b...