switches ssh and telnet.

[Manish Manwal]

i have more then 50+ switches. some of them is cisco 2960-l, 2960-i, 3650-i and some of them 3850nm

we can successfully ping all of them or successfully ssh them. but there is one switch (3650-i) that switch we cant ssh or telnet , even we cant ping that one. but if i logon first other switch then ping or ssh that switch, we can do that.

why that switch we cant ping or ssh directly? what we should have to do for direct access that switch.

[chrihussey]

Assuming all the switch's management interfaces are on a common network / VLAN, it sounds as if the switch you are having the issue with may not have the correct default gateway or mask.

[Manish Manwal]

all switches in same management vlan. mask is same. all configuration is same.

[chrihussey]

Is the default gateway correct and can the switch ping it?

[Joseph W. Doherty]

It's very rare, but occasionally I've seen an IOS operating incorrectly such that some functions work fine and some do not. What seems to "cure" this is a reload.

If you can, reload the device and see if the behavior remains the same.

[Manish Manwal]

this time i cant restart device. but i will try if my manager give a downtime for that.
any other suggestion that we do in running time?

[Joseph W. Doherty]

Not beyond those offered by Chris.

BTW, are you running "recommended" IOS versions? If not, a reload could be a good time to move to a more stable IOS version.

A couple of months back, had a 4500 that became "sick". In that case, it was still forwarding traffic, and could telnet to it, but couldn't load a newer IOS on it. (The reason for the newer IOS was it was considered [by Cisco] more stable. I.e. not directly due to the forgoing issue.) Had to reload it with the existing version, after the reload, we were then able to load the newer IOS on in and, of course, had to reload it again.

[Manish Manwal]

ohhhhhh.. which version is suitable for that ?
because we have recently upgrade that device ios.
now it run on 16.6.3 ios version , before this it run on 15.6.3b.

[Joseph W. Doherty]

You look for the recommendation release "stars".

[Manish Manwal]

best is 16.6.3. and it is also installed.
any other suggestion or solution sir .

[Joseph W. Doherty]

Not at this time.