Troubleshooting BGP Route Advertisement Origination and Receiving

Troubleshooting BGP Route Advertisement /Origination and Receiving

Another common problem after neighbor relationship issues that BGP operators face occurs in BGP route advertisement/origination and receiving. BGP originates routes only by configuration. However, it needs no configuration in receiving routes.

Larger ISPs originate new BGP routes for their customers on a daily basis, whereas small-enterprise BGP networks mostly configure BGP route origination upon first setup. Problems in route originating can occur because of either configuration mistakes or a lack of BGP protocol understanding. This section addresses a mix of simple and complicated problems seen in BGP route advertisement/origination and receiving.

The following is a list of problems discussed in this section related to BGP route originating and advertisement:

• A BGP route not getting originated

• Problem in propagating/originating a BGP route to IBGP/EBGP neighbors

• Problem in propagating a BGP route to an IBGP neighbor but not to an EBGP neighbor

• Problem in propagating an IBGP route to an IBGP/EBGP neighbor