Routing blackhole occurs when OSPF and IS-IS import routes from each other

When OSPF and IS-IS import routes to each other, packets cannot be forwarded based on routes due to the sequence of configuration operations and route convergence.
To solve the problem, perform the following operations:
1.When routes of routing protocols are distributed, filter imported routes to prevent loops.
2. When routes of routing protocols are imported, the route priority changes. Notice the route selection change due to imported routes and take measures to control routes.
For details, see Routing Blackhole Occurs When OSPF and IS-IS Import Routes From Each Other.

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