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) perspectiveand what are the rules/conditions to be in each state?
A1: Channel state machine from border perspective:
In PfRv3, border channel has the following three stats:
Provisional State: to indicate whether there's TC relying on this group on Channel <DSCP, Peer-Site-ID, Any-WAN-Exit>.
RX State: detected by local data plane to indicate the Channel reachability from remote to local.
TX State: detected by remote site, sending to local MC by unreachable TCA.
Q2: What are all the channel operational states from a master perspective and what are the rules/conditions to be in each state?
A2: Channel state machine from a master perspective:
In PfRv3, master channel has the following three stats:
Not-available (Initial state);
Not-available (no next-hop);
Available, but unreachable.
Q3: What are the channel states for Internet channels (site-id 255.255.255.255)?
A3: Channel states differ from the states for regular channels:
Channel Provisional State Machine:
Channel Rx State Machine:
Channel Tx State Machine:
Channel OIperational State Machine:
Q4: What happens with Internet channel if RIB loses 0.0.0.0/0 prefix over the Tunnel interface?
A4: In this scenario, the channel nexthop will be 0.0.0.0 that means the channel next-hop is lost, but the channel state is still Reachable. At the same time the channel is not available because the channel nexthop is lost.
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