08-21-2007 08:22 PM - edited 03-03-2019 06:25 PM
when does the ospf speaking router hangs in exstart state.
08-21-2007 08:48 PM
Hi Rangha,
See if this link helps you
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094050.shtml#fifth
Plese come back if you have any doubts.
Regards,
Ankur
08-22-2007 12:28 AM
Check for MTU mismatch between the neighbors
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f0d.shtml
HTH
Narayan
08-22-2007 03:47 AM
Hi,
One of the important issues that makes OSPF neighbor hangs on (Exstart state) is that a router is trying to make adjacency with a non DR/BDR on a segment. Offcourse those typically applied for NBMA & Broadcast OSPF Networks.
PLS try to influence the prioity at the interface level command to force the DR/BDR election.
NOTE: You may clear the OSPF process or reboot the router for the new election.
Regards,
Mohamed Sobair
08-26-2007 04:43 AM
Hi,
EDIT>> Here is absolute case for the Exstart OSPF neighbor state:
If you are configuring OSPF Over NBMA and hardcoding the command (IP OSPF Network point-to-multipoint) on the Hub & Spokes, Please make sure you remove all L3-to-L2 mapping from all router interfaces.
The fact that OSPF treats all links as acollection of Point-to-Point links typically possible when changing the Network type of the interface by (IP OSPF Network point-to-multipoint), by doing so, its dynamically discovering neighbors & it creats by itself L3-to-L2 maps for the neighbors , therfore , avoid static mapping which causes this problem.
HTH
Mohamed Sobair
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