Categories R&S

OSPF – Implement and troubleshoot filtering – Route-map

Let’s move one to another way of filtering traffic in OSPF.   Theory: Route-maps can be used in conjunction with distribute-list to filter traffic. Only inbound filtering is supported and this is local to the router routing table.   OSPF database advertisement are not affected when using route-map filtering.     Requirements: Make sure traffic […]

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Categories R&S

OSPF – Implement and troubleshoot filtering – Administrative distance

Let’s now have a look at using administrative distance to filter routes.   Theory: With OPSF, administrative distance can be changed per-prefix or per-neighbor. When setting an administrative distance of 255, the route cannot be installed in the routing table. The IP address use with the distance command refer to the originator of the prefix […]

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