Failing frr-reload because of activated AgentX protocol on Edgecore SONiC

[robertvolkmann]

Edgecore SONiC now activates the SNMP AgentX protocol by default in version 202111.6.

To accommodate this change, it's essential to add agentx to the FRR template. Without this addition, frr-reload encounters an error. The specific message displayed is:

"no agentx" we failed to remove this command
SNMP AgentX support cannot be disabled once enabled

AgentX is configured upon the container's start as shown below:

[program:vtysh_agentx]
command=/usr/bin/vtysh -c configure -c agentx
priority=6
autostart=false
autorestart=false
startsecs=0
stdout_logfile=syslog
stderr_logfile=syslog
dependent_startup=true
dependent_startup_wait_for=vtysh_b:exited

[robertvolkmann]

The change is not backward compatible. On older version frr-reload fails:

systemd[1]: Starting Reload FRR...
docker[3483642]: % [ISIS] Unknown command: agentx
docker[3483642]: line 1: Failure to communicate[2] to isisd, line: agentx
docker[3483642]: % [ISIS] Unknown command: agentx
docker[3483642]: line 5: Failure to communicate[2] to isisd, line: agentx
systemd[1]: frr-reload.service: Main process exited, code=exited, status=1/FAILURE
systemd[1]: frr-reload.service: Failed with result 'exit-code'.