There's no reason why the fiber needs to go via a media converter. As long as you have compatible SFPs, just use the SFP ports on the switches for your interconnections.
Leveraging the Stackwise capability is certainly a good idea. You'll need to plan your stack and re-provision the switches accordingly.
As far as your VLAN connections, there's no need to use physically separate lines for VLAN 20 and 21 as you have indicated on your "LAN new" diagram. I'd just trunk the interswitch connections and allow all VLANs over the trunks. You could even bond the two links together into a portchannel interface then for higher bandwidth.
[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...