Cisco urges stop using weak crypto algorithms with OSPF

To reduce the risk of service problems, Cisco is making it harder for organizations to use weak cryptographic algorithms when setting up authentication for OSPF packets on certain Catalyst Edge Platforms and Integrated Services Routers (ISR).

Newer versions of Cisco’s IOS XE software (Release 17.11.1 and later) no longer support those algorithms—DES, 3DES, and MD5—by default, Cisco stated in a field Notice.

Specifically, the algorithms are no longer default options for the open shortest path first v 3 (OSPFv3) protocol, which uses the IPsec secure socket…