right now i have one SWITCH and 3 routers connected with switch using Fast Interface. All routers are assigned with same subnet and in same subnet and in same VLAN.
As per OSPF default interface Network type is Broadcast, up to that all router form adjacency with each other but when i change the network type in one of the interface then neighbor adjacency goes down. so what will be the reason for that... if i will change it to the nonboradcast then it is the hello interval is there reason but when i changed it to the point to point then i was not able to find out the exact reason for that... so will you please help me to understand it...
There have been other discussions in the forum recently that relate to your question. The basics are that OSPF has different behavior depending on the network type defined on the interface (does the router use multicast hello on the interface to discover neighbors or not, when a neighbor is discovered should OSPF proceed immediately to form adjacency or should it first deal with election of DR and BDR, among others). On a particular subnet all OSPF routers should configure the same network type. If network type is different on some routers then as you have discovered OSPF neighbor relationship and adjacency are probably not formed correctly.
If i remeber correctly when the network type is nb you need to specify the neighbor in the ospf proccess, in nbma the hellos can not reach the neighbor and they need to be converted to unicast before sending them.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.