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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.

!

!

interface Loopback0

ip address 2.2.2.2 255.255.255.255

!

interface GigabitEthernet0/1

description ISP-1 OUTSIDE

ip address 141.41.176.26 255.255.255.252

load-interval 30

duplex full

speed 100

!

interface GigabitEthernet0/2

description ISP-2 OUTSIDE

ip address 180.51.19.10 255.255.255.252

load-interval 30

shutdown

duplex full

speed 1000

!

interface GigabitEthernet0/1/0

description Static INT to FIREWALL

switchport access vlan 141

no ip address

duplex full

speed 100

!

interface GigabitEthernet0/1/1

description BGP INT to FIREWALL

switchport access vlan 102

no ip address

duplex full

speed 100

!

interface GigabitEthernet0/1/2

description DNS

switchport access vlan 102

no ip address

!

interface Vlan102

description ###BGP WAN Pool - VLAN ###

ip address 102.15.150.1 255.255.255.224

!

interface Vlan141

description ISP-1 WAN Pool VLAN

ip address 141.41.176.125 255.255.255.224

!

router bgp 123456

bgp log-neighbor-changes

network 102.15.150.0 mask 255.255.255.0

neighbor 180.51.19.10 remote-as 12121

neighbor 180.51.19.10 description isp2

neighbor 180.51.19.10 soft-reconfiguration inbound

neighbor 180.51.19.10 route-map isp2 out

neighbor 141.41.176.26 remote-as 45450

neighbor 141.41.176.26 description isp1

neighbor 141.41.176.26 soft-reconfiguration inbound

neighbor 141.41.176.26 route-map isp1 out

maximum-paths 2

!

ip route 102.15.150.0 255.255.255.0 Null0 220

!

ip prefix-list isp1 seq 5 permit 102.15.150.0/24

!

ip prefix-list isp2 seq 5 permit 102.15.150.0/24

access-list 10 permit 102.15.150.0 0.0.0.255

!

route-map isp1 permit 10

match ip address prefix-list isp1

!

route-map isp2 permit 20

match ip address 10

set as-path prepend 123456 123456

!

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