If the image in the switches supports encryption then they should support SSH access. We can not tell from what you posted whether the switches do support encryption or not. It is a function of which feature set they are running more than a question of what version they are running. If you would post the output of show versions from the switches we could tell which feature set is running.
The 3500XL Series switches do not support ssh at all. Since these switches are End Of Life, there won't be future software for them either. If you require secure access to these older devices, because of something like audit requirements - the best way (without replacing the switch) is to use a console server (like a Cyclades) that supports ssh, which would then connect to the serial console port of each switch.
[toc:faq]The ProblemOn traditional switches whenever we have a trunk
interface we use the VLAN tag to demultiplex the VLANs. The switch needs
to determine which MAC Address table to look in for a forwarding
decision. To do this we require the switch to do...
[toc:faq]Introduction:Netdr is a tool available on a RSP720, Sup720 or
Sup32 that allows one to capture packets on the RP or SP inband. The
netdr command can be used to capture both Tx and Rx packets in the
software switching path. This is not a substitut...
IntroductionOSPF, being a link-state protocol, allows for every router
in the network to know of every link and OSPF speaker in the entire
network. From this picture each router independently runs the Shortest
Path First (SPF) algorithm to determine the b...