Category: Cisco IOS
Anything related to Cisco IOS
Cisco Aironet 3700 Series Access Points and expired Manufacturing Installed Certificates
Sometimes old equipment fails in mysterious ways. This time a whole fleet of Cisco Aironet 3700 Series Access Points disappeared from their controller. The access points have “Manufacturing Installed Certificates” and these certificates will expire sooner or later. In this case, the certificates expired sometime during the weekend.
Read More → Cisco Aironet 3700 Series Access Points and expired Manufacturing Installed CertificatesCisco IOS (XE) and OpenSSH 8.x
OpenSSH marches on and disables old and insecure algorithms. Sadly, Cisco IOS (XE) lags behind. Previously, I could do all scp operations from the cli in the switches. Now, I must do everything from the management station. For now, I can get by if I allow some of the older key exchange (key agreement) algorithms. […]
Read More → Cisco IOS (XE) and OpenSSH 8.xAdding a Cisco Catalyst 2960X switch to a Cisco Catalyst 2960S switch stack
A few things must be done before adding a Cisco Catalyst 2960X switch to a Cisco Catalyst 2960S switch stack. I assume you know your way around Cisco IOS, and already have the necessary hardware components.
Read More → Adding a Cisco Catalyst 2960X switch to a Cisco Catalyst 2960S switch stackRSA keys in Cisco switches and routers
See also Cisco Bug ID CSCuz72344.
Read More → RSA keys in Cisco switches and routersLogging messages from Cisco IOS 12.2(55)SE to an IPv6 enabled syslog host
While reloading a Cisco Catalyst 3560 running IOS 12.2(55)SE the other day, I noticed the switch stopped sending messages to the configured IPv6 enabled syslog host. Nothing appeared in the log files on the syslog host until I manually disabled and reenabled the log statement.
Read More → Logging messages from Cisco IOS 12.2(55)SE to an IPv6 enabled syslog host