OSPFv2 MD5 Authentication
Lesson 6: OSPFv2 MD5 Authentication
Unlike EIGRP for IPv4 MD5 authentication, OSPFv2 MD5 authentication does not allow the configuration of a key chain with time-based authentication keys. However, multiple keys can be configured on an interface, each with a different key number, called a key ID. To migrate to a new key, you would first configure a new key value on all routers in a subnet and then delete the configuration of the old keys. To avoid having network failures during this cutover, OSPF actually sends and accepts messages that use all the currently configured authentication keys on an interface.
Unlike OSPFv2 ...
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