Not a synchronization issue :/ 2011/9/1 Mike Powell <[email protected]>: > You could be running into an issue I found while working a lab last night > and again in another lab within the past few weeks. It has to do with > redistribution of OSPF into BGP and the requirements BGP has around best > path selection. I'm still learning all the issues around how this issue is > introduced, but in my case the lab said I couldn't configure iBGP in full > mesh, and a had to enable synchronization. This causes the following problem > with routes being added to the route table: > > If BGP synchronization is enabled, there must be a match for the prefix in > the IP routing table in order for an internal BGP (iBGP) path to be > considered a valid path. BGP synchronization is enabled by default in Cisco > IOS® Software. If the matching route is learned from an Open Shortest Path > First (OSPF) neighbor, its OSPF router ID must match the BGP router ID of > the iBGP neighbor. Most users prefer to disable synchronization with use of > the no synchronization BGP subcommand. > > reference: > http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094431.shtml#background > > Not sure if this helps you or not, but I'd like one of the experts to expand > on this issue a little more. I'm not sure I'd be able to detect this > condition in a lab b/c the conditions are subtle. > > thanks > > _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
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