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BGP does not advertise iBGP-learned routes to eBGP peers

Core Issue

A Border Gateway Protocol (BGP) router with synchronization enabled does not advertise internal BGP (iBGP)-learned routes to other external BGP (eBGP) peers if it is not able to validate those routes in its Interior Gateway Protocol (IGP).


To resolve this issue, check the IGP configuration or disable synchronization by issuing the no synchronization command in the router BGP configuration.

For additional information, refer to the Unable to Announce iBGP-Learned Routes section of Troubleshooting When BGP Routes Are Not Advertised.

Type of Route Missing from Routing Table

All routes / All routes from specific neighbor

Valid Route to BGP Next Hop

Valid route to next hop exists

show ip bgp neighbors {neighbor  address}

State is established

Version history
Revision #:
1 of 1
Last update:
‎06-18-2009 03:57 PM
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