Question

An ISP peers with two upstream providers, ISP-A and ISP-B, and receives the prefix 203.0.113.0/24 from both. On router R1 (IOS XR), the operator wants all traffic to this prefix to prefer ISP-A but needs the preference to remain local to R1 only, without influencing any other IBGP router in the AS. Both received routes are otherwise identical (same AS-path length, origin, and MED). Which attribute should the operator set inbound from ISP-A to accomplish this?

Accepted Answer

Set a higher Weight on routes received from ISP-A

Answer

Set a higher Local Preference on routes received from ISP-A

Answer

Set a lower MED on routes received from ISP-A

Answer

Prepend the AS-path on routes received from ISP-B