[c-nsp] Unknown connection on 3750

[Sergey Velikanov [Intelsoft]]

Sergey Velikanov [Intelsoft] wrote:
> Hi
> 
> I've got two 3750 in stack. And suddenly I've discovered unknown tcp connection on this switch
> 
> #sh tcp brief
> TCB       Local Address           Foreign Address        (state)
> 03AECA48  cat.ip.add.ress.22      192.168.10.83.49944    ESTAB   <-- this is connection of mine
> 03AB67D8  127.0.0.20.23           127.0.0.3.11001        ESTAB
> 03CC2648  127.0.0.20.23           127.0.0.3.11000        ESTAB
> 
> could anybody explain whois connected to 127.0.0.20 ?

This connection from one switch in stack to another (from slave to master).

sw2#sh tcp brief
TCB       Local Address           Foreign Address        (state)
03AB67D8  127.0.0.20.23           127.0.0.3.11001        ESTAB
03CC2648  127.0.0.20.23           127.0.0.3.11000        ESTAB

sw2-1#sh tcp brief
TCB       Local Address           Foreign Address        (state)
03D95668  127.0.0.3.11001         127.0.0.20.23          ESTAB
03BD6130  127.0.0.3.11000         127.0.0.20.23          ESTAB