When a new router joins an established network (assuming that a DR and a BDR have already been elected) it does not cause the DR selection process to process again. Joining a network is not a pre-emptive act that allows the new router to immediately become DR or BDR.
Just to add to Rick's post, when a new router is added to a network (with a DR/BDR already elected), the router *will* carry out a DR election. However, the result of this election will be that the current DR/BDR will be re-elected.
The following occurrences cause the DR election to be run (from RFC2328):
o Bidirectional communication has been established to a neighbor. In other words, the state of the neighbor has transitioned to 2-Way or higher.
o There is no longer bidirectional communication with a neighbor. In other words, the state of the neighbor has transitioned to Init or lower.
o One of the bidirectional neighbors is newly declaring itself as either Designated Router or Backup Designated Router. This is detected through examination of that neighbor's Hello Packets.
o One of the bidirectional neighbors is no longer
declaring itself as Designated Router, or is no longer declaring itself as Backup Designated Router. This is again detected through examination of that neighbor's Hello Packets.
o The advertised Router Priority for a bidirectional neighbor has changed. This is again detected through examination of that neighbor's Hello Packets.
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.