I'm reading about ISDN and I keep seeing reference to "rotary group". I can't seem to find any explanation on what exactly this is. I can see that it seems to be a combination of B-channels, but why the term rotary. Does it move from one channel to another?
I think the term rotary can indeed suggest that B-channels are switched based on availability, but that is not the case. A rotary group is basically a tool to have multiple physical BRI interfaces inherit the configurations from a Dialer interface, thereby easing the configuration process and avoiding human errors. Usually, in order for B-channels to be switched based on availability, you need to request a hunt group from the Telco, which lets incoming calls be dynamically routed to a free line on any of the interfaces in your rotary group.
Rotary groups are considered legacy, it is better to configure Dialer Profiles instead.
This document gives several answers on frequently asked questions for PFRv3 channel state behavior.
Q1: What are all the channel operational states from a BR (border role) perspective and what are the rules/conditions to be in each st...
The need was to reach an host inside a LAN through a VPN connection managed by the LAN gateway (Cisco 1921).
The LAN gateway performs NAT and there was a dedicate nat rule for the host i wanted to reach through VPN.
I couldn't connect to the hos...