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Reinstate the previous mutually valid authentication key under the change plan until coordinated rotation is complete. This instead concerns ospf authentication mismatch. Routing protocol authentication must agree between neighbors; a mismatched secret prevents trusted control-plane exchange. It would not safely roll back the relevant failed change. The immediate problem concerns ospf passive interface policy.

Withdraw the offending external advertisement and restore the prior filtered redistribution policy for the affected campus deployment. This instead concerns ospf route redistribution and loops. Redistribution moves routes between origins; without scope and loop controls, connectivity can change across many sites at once. It would not safely roll back the relevant failed change. The immediate problem concerns ospf passive interface policy.

Reinstate the prior accepted cost values if the updated metric diverts traffic unexpectedly. This instead concerns ospf path cost preference. OSPF route cost influences path selection among eligible OSPF paths; it must reflect planned traffic engineering rather than simply interface link state. It would not safely roll back the relevant failed change. The immediate problem concerns ospf passive interface policy.

Inspect redistribution policy, route tags, imported prefix filters and the resulting external LSA path. This instead concerns ospf route redistribution and loops. Redistribution moves routes between origins; without scope and loop controls, connectivity can change across many sites at once. It does not isolate the cause of the stated incident. The immediate problem concerns ospf authentication mismatch.

Inspect effective OSPF interface costs and the selected path in each relevant routing table. This instead concerns ospf path cost preference. OSPF route cost influences path selection among eligible OSPF paths; it must reflect planned traffic engineering rather than simply interface link state. It does not isolate the cause of the stated incident. The immediate problem concerns ospf authentication mismatch.

Inspect BGP peer IP reachability, local and remote AS configuration and session error state. This instead concerns bgp neighbor asn and tcp session. BGP peering requires correctly matched autonomous-system expectations and a reachable session path; routes cannot exchange without a valid peer. It does not isolate the cause of the stated incident. The immediate problem concerns ospf authentication mismatch.

Limit redistribution to approved prefixes and use loop-prevention tags or filtering where the topology requires them. This instead concerns ospf route redistribution and loops. Redistribution moves routes between origins; without scope and loop controls, connectivity can change across many sites at once. It would not implement the specifically required change. The immediate problem concerns ospf authentication mismatch.

Set intentional supported OSPF costs consistent with design and bandwidth expectations. This instead concerns ospf path cost preference. OSPF route cost influences path selection among eligible OSPF paths; it must reflect planned traffic engineering rather than simply interface link state. It would not implement the specifically required change. The immediate problem concerns ospf authentication mismatch.

Correct the configured neighbor AS or intended local routing instance under the approved peering agreement. This instead concerns bgp neighbor asn and tcp session. BGP peering requires correctly matched autonomous-system expectations and a reachable session path; routes cannot exchange without a valid peer. It would not implement the specifically required change. The immediate problem concerns ospf authentication mismatch.

Verify only authorized external routes are advertised and preferred next hops remain stable at a remote peer. This instead concerns ospf route redistribution and loops. Redistribution moves routes between origins; without scope and loop controls, connectivity can change across many sites at once. It would not establish that this function actually works. The immediate problem concerns ospf authentication mismatch.

Verify the primary next hop is selected while the backup becomes active after a controlled primary failure. This instead concerns ospf path cost preference. OSPF route cost influences path selection among eligible OSPF paths; it must reflect planned traffic engineering rather than simply interface link state. It would not establish that this function actually works. The immediate problem concerns ospf authentication mismatch.

Confirm BGP Established state and receipt of the expected authorized prefixes. This instead concerns bgp neighbor asn and tcp session. BGP peering requires correctly matched autonomous-system expectations and a reachable session path; routes cannot exchange without a valid peer. It would not establish that this function actually works. The immediate problem concerns ospf authentication mismatch.

Withdraw the offending external advertisement and restore the prior filtered redistribution policy. This instead concerns ospf route redistribution and loops. Redistribution moves routes between origins; without scope and loop controls, connectivity can change across many sites at once. It would not safely roll back the relevant failed change. The immediate problem concerns ospf authentication mismatch.

Restore the prior accepted cost values if the updated metric diverts traffic unexpectedly. This instead concerns ospf path cost preference. OSPF route cost influences path selection among eligible OSPF paths; it must reflect planned traffic engineering rather than simply interface link state. It would not safely roll back the relevant failed change. The immediate problem concerns ospf authentication mismatch.

Restore the previous valid ASN and peer address if the revised neighbor relationship cannot establish. This instead concerns bgp neighbor asn and tcp session. BGP peering requires correctly matched autonomous-system expectations and a reachable session path; routes cannot exchange without a valid peer. It would not safely roll back the relevant failed change. The immediate problem concerns ospf authentication mismatch.

Review redistribution policy, route tags, imported prefix filters and the resulting external LSA path. This instead concerns ospf route redistribution and loops. Redistribution moves routes between origins; without scope and loop controls, connectivity can change across many sites at once. It does not isolate the cause of the stated incident. The immediate problem concerns ospf authentication mismatch.

Review effective OSPF interface costs and the selected path in each relevant routing table. This instead concerns ospf path cost preference. OSPF route cost influences path selection among eligible OSPF paths; it must reflect planned traffic engineering rather than simply interface link state. It does not isolate the cause of the stated incident. The immediate problem concerns ospf authentication mismatch.

Review BGP peer IP reachability, local and remote AS configuration and session error state. This instead concerns bgp neighbor asn and tcp session. BGP peering requires correctly matched autonomous-system expectations and a reachable session path; routes cannot exchange without a valid peer. It does not isolate the cause of the stated incident. The immediate problem concerns ospf authentication mismatch.

Review redistribution policy, route tags, imported prefix filters and the resulting external LSA path. This instead concerns ospf route redistribution and loops. Redistribution moves routes between origins; without scope and loop controls, connectivity can change across many sites at once. It is not one of the requested paired diagnosis and configuration actions. The immediate problem concerns ospf authentication mismatch.

Apply intentional supported OSPF costs consistent with design and bandwidth expectations. This instead concerns ospf path cost preference. OSPF route cost influences path selection among eligible OSPF paths; it must reflect planned traffic engineering rather than simply interface link state. It is not one of the requested paired diagnosis and configuration actions. The immediate problem concerns ospf authentication mismatch.

Confirm only authorized external routes are advertised and preferred next hops remain stable at a remote peer. This instead concerns ospf route redistribution and loops. Redistribution moves routes between origins; without scope and loop controls, connectivity can change across many sites at once. It would not establish that this function actually works. The immediate problem concerns ospf authentication mismatch.

Confirm the primary next hop is selected while the backup becomes active after a controlled primary failure. This instead concerns ospf path cost preference. OSPF route cost influences path selection among eligible OSPF paths; it must reflect planned traffic engineering rather than simply interface link state. It would not establish that this function actually works. The immediate problem concerns ospf authentication mismatch.

Verify BGP Established state and receipt of the expected authorized prefixes. This instead concerns bgp neighbor asn and tcp session. BGP peering requires correctly matched autonomous-system expectations and a reachable session path; routes cannot exchange without a valid peer. It would not establish that this function actually works. The immediate problem concerns ospf authentication mismatch.

Withdraw the offending external advertisement and restore the prior filtered redistribution policy for the affected campus deployment. This instead concerns ospf route redistribution and loops. Redistribution moves routes between origins; without scope and loop controls, connectivity can change across many sites at once. It would not safely roll back the relevant failed change. The immediate problem concerns ospf authentication mismatch.

Reinstate the prior accepted cost values if the updated metric diverts traffic unexpectedly. This instead concerns ospf path cost preference. OSPF route cost influences path selection among eligible OSPF paths; it must reflect planned traffic engineering rather than simply interface link state. It would not safely roll back the relevant failed change. The immediate problem concerns ospf authentication mismatch.

Reinstate the previous valid ASN and peer address if the revised neighbor relationship cannot establish. This instead concerns bgp neighbor asn and tcp session. BGP peering requires correctly matched autonomous-system expectations and a reachable session path; routes cannot exchange without a valid peer. It would not safely roll back the relevant failed change. The immediate problem concerns ospf authentication mismatch.

Inspect effective OSPF interface costs and the selected path in each relevant routing table. This instead concerns ospf path cost preference. OSPF route cost influences path selection among eligible OSPF paths; it must reflect planned traffic engineering rather than simply interface link state. It does not isolate the cause of the stated incident. The immediate problem concerns ospf route redistribution and loops.

Inspect BGP peer IP reachability, local and remote AS configuration and session error state. This instead concerns bgp neighbor asn and tcp session. BGP peering requires correctly matched autonomous-system expectations and a reachable session path; routes cannot exchange without a valid peer. It does not isolate the cause of the stated incident. The immediate problem concerns ospf route redistribution and loops.

Inspect advertised-routes output, prefix-list or route-map matches and the exact remote peer policy. This instead concerns bgp prefix filtering outbound. BGP route advertisements require explicit filtering because a functioning neighbor session does not prove prefix-sharing authorization. It does not isolate the cause of the stated incident. The immediate problem concerns ospf route redistribution and loops.

Set intentional supported OSPF costs consistent with design and bandwidth expectations. This instead concerns ospf path cost preference. OSPF route cost influences path selection among eligible OSPF paths; it must reflect planned traffic engineering rather than simply interface link state. It would not implement the specifically required change. The immediate problem concerns ospf route redistribution and loops.

Correct the configured neighbor AS or intended local routing instance under the approved peering agreement. This instead concerns bgp neighbor asn and tcp session. BGP peering requires correctly matched autonomous-system expectations and a reachable session path; routes cannot exchange without a valid peer. It would not implement the specifically required change. The immediate problem concerns ospf route redistribution and loops.

Constrain outbound BGP advertisement to approved prefixes and route-map matches for that peer. This instead concerns bgp prefix filtering outbound. BGP route advertisements require explicit filtering because a functioning neighbor session does not prove prefix-sharing authorization. It would not implement the specifically required change. The immediate problem concerns ospf route redistribution and loops.