Refer to the topology diagram The R1, R2, R3. and R4 routers are not able to establish a full mesh of ©GP peering sessions using the loopback interface as the BGP neighbor IP address.
Drag the required troubleshooting steps on the left and drop them in the boxes on the right, with the lowest OSI layer as the topmost box. Place the steps from the lowest to the highest layer, using a bottom-up approach.
Check the router interface status to see if it is in the up/up state.
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Check if each router can ping the loopback interface of all the other routers.
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Check if the routers are learning the loopback interface of the other routers via the IGP.
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Check the BGP configurations on all the routers.
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1
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Check the router interface status to see if it is in the up/up state.
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2
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Check if each router can ping the loopback interface of all the other routers.
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3
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Check if the routers are learning the loopback interface of the other routers via the IGP.
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4
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Check the BGP configurations on all the routers.
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