What I have read and know till now is since ospf behaves like distance vector protocol for inter area communication hence it is vulnerable to routing loops that’s why all the ABRs must be connected to ospf area0 and interarea communication happens through backbone area ….but you may ask that how distance vector in inter… Read More Question : Why all other areas must be connected to ospf area 0(backbone)?
On this blog I would like to discuss few basic details of ospf which everybody needs to know and which is very helpful to build the concepts of OSPF. For this we are going to use below reference GNS 3 topology. Question 1 : How and when the information about the ABR and ASBR is… Read More OSPF : Few basic questions…
Some more details about ISIS: Packet types in ISIS : Hello Packets : Just like other IGPs ISIS also uses hello packets to form the adjacency and as a keepalive mechanism. ISIS has many hello packets intermediate system to intermediate system hello(IIHs), End system to intermediate system hellos(EIHs- sent to mac 09-00-2B-00-00-05), Intermediate system to… Read More ISIS Continued…
WHY ISIS : As we all know that ISIS is making a comeback in form of entirely different forwarding technologies like Fabric path(Cisco), SPB(Avaya,Alcatel etc),Qfabric(juniper). Specially in the world of data center in coming few days you would see the necessity to learn ISIS. Considering this even Cisco has introduced ISIS in its CCIE RnS… Read More IS-IS basic implementation