openssh + Cisco

After update OpenSSH cannot connect to Cisco routers (1841, 3550). After some searching on the Web I found a similar bug #1026430 in on Red Hat Bugzilla.Solution was to add KexAlgorithms=diffie-hellman-group1-sha1 option to ssh command while connecting to routeres.
Another method is to create ~/.ssh/config with a couple of lines:

Host bigrouter
        HostName        192.168.0.1
        KexAlgorithms   diffie-hellman-group1-sha1