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That diagnosis is supported by a different symptom: The route with higher MED is chosen because the operator assumes MED acts as larger-is-better. Here the recorded observation is: traffic chooses the longer provider path although all higher-priority attributes tie and the shorter path is eligible. The applicable cause is: an intentional AS-path prepend on the shorter provider made it appear longer to the receiver.

That diagnosis is supported by a different symptom: An engineer predicts the shorter AS_PATH must win although another route has higher LOCAL_PREF. Here the recorded observation is: traffic chooses the longer provider path although all higher-priority attributes tie and the shorter path is eligible. The applicable cause is: an intentional AS-path prepend on the shorter provider made it appear longer to the receiver.

That diagnosis is supported by a different symptom: `show bgp` displays a received network but no usable installed route due to inaccessible next hop. Here the recorded observation is: traffic chooses the longer provider path although all higher-priority attributes tie and the shorter path is eligible. The applicable cause is: an intentional AS-path prepend on the shorter provider made it appear longer to the receiver.

That control reduces a separate risk: BGP preference order evaluates higher LOCAL_PREF before AS path length when otherwise eligible. For the described design, the recurring risk arises from: an intentional AS-path prepend on the shorter provider made it appear longer to the receiver. The specific required safeguard is: review prepend policy and baseline attribute priorities together before traffic engineering.

That control reduces a separate risk: The BGP NEXT_HOP attribute has no resolvable path in the routing table. For the described design, the recurring risk arises from: an intentional AS-path prepend on the shorter provider made it appear longer to the receiver. The specific required safeguard is: review prepend policy and baseline attribute priorities together before traffic engineering.

That control reduces a separate risk: BGP MED is a lower-is-better hint in the relevant comparison context. For the described design, the recurring risk arises from: an intentional AS-path prepend on the shorter provider made it appear longer to the receiver. The specific required safeguard is: review prepend policy and baseline attribute priorities together before traffic engineering.

Applying an appropriate Cisco-local BGP weight policy on the chosen router without expecting it to propagate to peers would not interpret lower MED as preferable in its applicable comparison scope after more-preferred BGP attributes tie.

Applying the intended inbound/local BGP local preference policy consistently within the receiving AS would not interpret lower MED as preferable in its applicable comparison scope after more-preferred BGP attributes tie.

Comparing valid BGP AS path lengths at the appropriate decision stage and selecting shorter path when higher priorities tie would not interpret lower MED as preferable in its applicable comparison scope after more-preferred BGP attributes tie.

This test measures a different behavior: Read BGP path attributes and best-path result for the two alternatives. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect the advertised MED attributes, tie-break prerequisites and selected route.

This test measures a different behavior: Inspect local weight and best-path choice, then confirm neighboring iBGP routers do not inherit that weight. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect the advertised MED attributes, tie-break prerequisites and selected route.

This test measures a different behavior: Inspect `show bgp` best-path attributes and verify the higher local-preference path is chosen. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect the advertised MED attributes, tie-break prerequisites and selected route.

That diagnosis is supported by a different symptom: An operator expects a change to local Cisco weight to alter all routers' best paths. Here the recorded observation is: the route with higher MED is chosen because the operator assumes MED acts as larger-is-better. The applicable cause is: bGP MED is a lower-is-better hint in the relevant comparison context.

That diagnosis is supported by a different symptom: Traffic chooses the longer provider path although all higher-priority attributes tie and the shorter path is eligible. Here the recorded observation is: the route with higher MED is chosen because the operator assumes MED acts as larger-is-better. The applicable cause is: bGP MED is a lower-is-better hint in the relevant comparison context.

That diagnosis is supported by a different symptom: An engineer predicts the shorter AS_PATH must win although another route has higher LOCAL_PREF. Here the recorded observation is: the route with higher MED is chosen because the operator assumes MED acts as larger-is-better. The applicable cause is: bGP MED is a lower-is-better hint in the relevant comparison context.

That control reduces a separate risk: An intentional AS-path prepend on the shorter provider made it appear longer to the receiver. For the described design, the recurring risk arises from: bGP MED is a lower-is-better hint in the relevant comparison context. The specific required safeguard is: verify MED comparison behavior and provider AS context rather than assuming it overrides local preference.

That control reduces a separate risk: BGP weight is locally significant and is not advertised in BGP updates. For the described design, the recurring risk arises from: bGP MED is a lower-is-better hint in the relevant comparison context. The specific required safeguard is: verify MED comparison behavior and provider AS context rather than assuming it overrides local preference.

That control reduces a separate risk: BGP preference order evaluates higher LOCAL_PREF before AS path length when otherwise eligible. For the described design, the recurring risk arises from: bGP MED is a lower-is-better hint in the relevant comparison context. The specific required safeguard is: verify MED comparison behavior and provider AS context rather than assuming it overrides local preference.

Applying an explicit outbound BGP prefix list or route-map advertising only approved public networks would not address the need for prepend the customer's own ASN on advertisements sent through the backup eBGP peer as appropriate.

Originate only the intended present RIB prefixes using valid BGP network or controlled redistribution policy would not address the need for prepend the customer's own ASN on advertisements sent through the backup eBGP peer as appropriate.

Applying the intended inbound/local BGP local preference policy consistently within the receiving AS would not address the need for prepend the customer's own ASN on advertisements sent through the backup eBGP peer as appropriate.

This test measures a different behavior: Compare BGP locally originated and advertised routes with the underlying RIB for the subnet. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect the AS_PATH actually advertised to backup and primary providers.

This test measures a different behavior: Inspect `show bgp` best-path attributes and verify the higher local-preference path is chosen. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect the AS_PATH actually advertised to backup and primary providers.

This test measures a different behavior: Check advertised-routes from the local neighbor and confirm private RFC1918 entries are absent. It does not establish the target outcome. For the documented fault, the direct acceptance test is: inspect the AS_PATH actually advertised to backup and primary providers.

That diagnosis is supported by a different symptom: An engineer predicts the shorter AS_PATH must win although another route has higher LOCAL_PREF. Here the recorded observation is: the backup provider receives an equally short AS_PATH and incoming traffic does not prefer the primary as intended. The applicable cause is: no AS_PATH length distinction was created on the backup advertisement.

That diagnosis is supported by a different symptom: Internal 10.0.0.0/8 summaries appear in a third-party eBGP peer's received table. Here the recorded observation is: the backup provider receives an equally short AS_PATH and incoming traffic does not prefer the primary as intended. The applicable cause is: no AS_PATH length distinction was created on the backup advertisement.

That diagnosis is supported by a different symptom: BGP Established appears healthy but the neighbor learns zero intended customer routes. Here the recorded observation is: the backup provider receives an equally short AS_PATH and incoming traffic does not prefer the primary as intended. The applicable cause is: no AS_PATH length distinction was created on the backup advertisement.

That control reduces a separate risk: The required prefix was not originated into BGP despite a working peer session. For the described design, the recurring risk arises from: no AS_PATH length distinction was created on the backup advertisement. The specific required safeguard is: check upstream best-path policy because external LOCAL_PREF can override an AS_PATH prepend.

That control reduces a separate risk: BGP preference order evaluates higher LOCAL_PREF before AS path length when otherwise eligible. For the described design, the recurring risk arises from: no AS_PATH length distinction was created on the backup advertisement. The specific required safeguard is: check upstream best-path policy because external LOCAL_PREF can override an AS_PATH prepend.

That control reduces a separate risk: The BGP outbound advertisement policy does not restrict routes to the approved customer prefix set. For the described design, the recurring risk arises from: no AS_PATH length distinction was created on the backup advertisement. The specific required safeguard is: check upstream best-path policy because external LOCAL_PREF can override an AS_PATH prepend.

Originate only the intended present RIB prefixes using valid BGP network or controlled redistribution policy would not correct the neighbor IP to the reachable remote interface address and validate local source selection.

Prepend the customer's own ASN on advertisements sent through the backup eBGP peer as appropriate would not correct the neighbor IP to the reachable remote interface address and validate local source selection.

Configuring the neighbor address with the correct remote autonomous-system number and reachable interface source would not correct the neighbor IP to the reachable remote interface address and validate local source selection.