Hi, On Fri, Oct 25, 2013 at 03:56:45PM +0000, Amadeus wrote: > Dear list, > can you explain why the following route (0.0.0.0/0) is selected to go via > as403, as as4057 clearly displays the shortest path here? > As you can see I have used bgp_path.prepend() 3x on as403 for its own ASN. > Thanks, Amadeus > bird> show route for 0.0.0.0/0 table ffc all > 0.0.0.0/0 via 169.254.40.3 on ffc403 [as403 14:38] * (150) > [AS403i] > Type: BGP unicast univ > BGP.origin: IGP > BGP.as_path: 403 403 403 403 > BGP.next_hop: 169.254.40.3 > BGP.local_pref: 100 > via 169.254.40.64 on ffc4064 [as4064 14:32] (100) > [AS4057i] > Type: BGP unicast univ > BGP.origin: IGP > BGP.as_path: 4064 40120 4057 > BGP.next_hop: 169.254.40.64 > BGP.local_pref: 100 > via 169.254.40.57 on ffc4057 [as4057 Oct14] (100) > [AS4057i] > Type: BGP unicast univ > BGP.origin: IGP > BGP.as_path: 4057 > BGP.next_hop: 169.254.40.57 > BGP.local_pref: 100
it is because local-pref. Default route to AS403 has higher local-pref than one to AS4057. -- Alexander Shikov Technical Staff, Digital Telecom IX Tel.: +380 44 201 14 07 http://dtel-ix.net/
