How to restore work between 2 cisco?

Question

Cisco

Good afternoon. Lost connection between cisco. One of them is in the branch. The only thing that has changed in the morning is that we have configured access to the device in the branch via telnet. After that, communication with the device is lost, but it pings other network devices in other branches. Tell me where to dig or maybe there is a ready-made solution?
PS Is it necessary to set up a trunk between devices?
PS management pings other branches, but where telnet was installed, the connection was lost.

Answer 1

Give money to someone who knows how - he will figure it out.

Answer 2

I absolutely can not understand the question, although I tried to re-read it several times.
What is meant by "lost" connection:
- Lost access via telnet?
- Lost ping to the device?
"Pinging other network devices in other branches" - Who is pinging? Missing Cisco?
I can not imagine the connection between the loss of ping and the telnet setting.
Did the ACL guys hang the wrong one or the wrong place when they tried to restrict access via telnet?

Answer 3

SergSolomin probably matter in acl. Can you roll back the branch router config? To the state "before changes"? and throw the delta here in the config?

Answer 4

show archive log config all what does it say?

Answer 5

The only commands we enter are:
cisco(conf)# interface fa 0/1
cisco(conf-if)# line vty 0 15
cisco(conf-line)# password *******
cisco(conf-line )# login
cisco(conf-line)# transport input telnet
Of course, it's not clear why they came to the interface, but I think that's the point.