OSPF is used as PE-CE protocol.
An operations engineer is concerned about CPU and memory shortage on PE routers caused by an OSPF misconfiguration on the CE routers.
Which OSPF feature protects the PE routers against this shortage?
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A. B. C. D.A.
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/xe-16-5/iro-xe-16-5-book/iro-lk-state-db.htmlThe correct answer is A. OSPF Link-State Database Overload Protection.
OSPF (Open Shortest Path First) is a routing protocol used to exchange routing information between routers within an autonomous system (AS). It is commonly used in Service Provider networks, particularly in MPLS VPN deployments, where it is used as the PE-CE protocol.
In this scenario, the operations engineer is concerned about CPU and memory shortages on the PE routers caused by an OSPF misconfiguration on the CE routers. If the CE routers are misconfigured and generate too many OSPF updates, the PE routers may become overwhelmed with OSPF processing and suffer from CPU and memory shortages.
To protect the PE routers against this shortage, OSPF provides a feature called Link-State Database Overload Protection. This feature is designed to prevent OSPF routers from being overwhelmed by excessive amounts of LSAs (Link State Advertisements) and to protect the OSPF link-state database from becoming too large.
When OSPF detects that the link-state database is approaching its capacity, it triggers a process called LSA flood reduction. This process reduces the frequency of LSA floods, which in turn reduces the amount of OSPF traffic on the network. The LSA flood reduction process can be configured to activate based on various thresholds, such as the number of LSAs or the percentage of the database utilized.
In summary, OSPF Link-State Database Overload Protection is a feature that protects the PE routers against CPU and memory shortages caused by an OSPF misconfiguration on the CE routers. It accomplishes this by reducing the frequency of LSA floods when the OSPF link-state database approaches its capacity.