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ospfd: logging behavior for area id mismatches #16745

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When an ospf interface is not in the backbone area, but it receives a packet from the backbone, no logs are generated for this mismatch due to the current check. However, the opposite scenario does generate logs. Removing this check shouldn’t cause issues, because the ospf_verify_header() function will still drop packets with a different area id, even if the VLINK is active.

When an ospf interface is not in the backbone area, but it receives a
packet from the backbone, no logs are generated for this mismatch due to
the current check. However, the opposite scenario does generate logs.
Removing this check shouldn’t cause issues, because the
`ospf_verify_header()` function will still drop packets with a different
area id, even if the VLINK is active.

Signed-off-by: Loïc Sang <[email protected]>
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