Im looking at setting up a sites resilience using dual connections to two routers running BGP. If the two links are not equal i.e. the primary link that all traffic routes over in a normal situation is 100Mbps but the back link that will be used should the primary go down is only 10Mbps im trying to test how stable BGP will be in this situation should the 10Mbps link be "maxed out for long durations". trying to ram 30Mbps down the 10Mbps link I could get packet loss over the link but BGP remained stable "this is good" but was wondering if this is just luck. Does by default Cisco routers give higher priority in the output buffer to protocols such as BGP. Will other traffic always be dropped before BGP.
Any advice appreciated.