Issues with router throughput while using multihomed BGP network
We have a multihomed WAN connectivity, the primary link is give the priority as it has 100 Mbps and we wish to failover to secondary (30 Mbps) only when primary is down. Attached the diagram for reference.
Previous to the BGP link we had a static connectivity to single ISP(ISP1) and this used to be the default routing path. Now for redundancy purpose we have changed the default path to go via the bgp network.
After changing the default route to BGP we have noticed that the download speed dropped down to 20 kb/s, also the outside interface usage not crossing 3 Mb/s. Later for testing purpose we have shutdown the secondary ISP interface (int g0/2) and suddenly the outside interface bandwidth gone up to 50 % of its capacity and also the download speed increased to the normal values.
We are continuiing with the secondary interface shutdown and planning to manually bring this interface if primary goes down. Any idea why the bandwidth is dropping when both ISP interfaces are active. Below are the BGP configurations in the WAN router, please help me to fix this issue because i am clueless about the problem.
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