OSPF LSA Types

Only the router that created the LSA can modify or withdraw it, all other routers can only process or forward it. Each LSA contains the sequence number and max-age timer. The router that originally advertised an LSA refloods it (after incrementing sequence number by 1) based on a per-LSA link state refresh interval (default 30 …

CEF – Cisco Express Forwarding

I am currently studying to rectify my CCIE R&S and it is at these times that I realise there is so much I have studied and learnt but forgotten. There are many cool things I come across that I think at the time are useful features that I need to remember, but unfortunately if you …

vCentre in Azure over IPsec and GRE

As part of a temporary solution I had to join a new office to our existing Data Centres and OSPF core using a Gig circuit over the Internet. To flesh out this idea and test its viability I thought I would try and solve an ESX capacity problem I have at home and move vCentre …