In the UK, it's possible to get cost-effective layer-2 WAN links, thanks to modern nationwide IP networks. Check with your in-country ISPs to find out what they offer.
If your two sites are quite close, then you might be able to get a dedicated fibre connection. Our main provider offers a route distance of up to 40km. This approach is more cost-effective for larger bandwidths, like 1Gbps or 10Gbps.
Another consideration is whether or not you want redundant fibre paths. Be aware that most providers will not guarantee fibre sepracy throughout the lifetime of the contract. Ideally, you want the carrier to have an internal sign-off process for any proposed fibre works that will run close by your own fibre.
However, do you really need to extend the VLAN? I don't know much about applications, but whenever I ask if an appliaction needs to be on the same subnet between sites, then the answer these days is usually 'no'. Routing between networks will also prevents the spread of virus' between sites.
[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...