[Xorp-users] connection to bgpd

[Atanu Ghosh]

As a XORP router is composed of a number of processes we have a
mechanism for monitoring processes. Our IPC system monitors all processes
that register with it. Any process can be notified of the birth and
death events of any other process. I believe this is implemented with a
TCP connection.

One example of how this is used can be found in
bgp/process_watch.cc. The XORP BGP process registers interest in the FEA
,RIB and snmp process (if this exists BGP will send events to it). If
the FEA or RIB dies then BGP will shutdown.

As your process, lets call it N is using XRLs it will be registered with
the system. Therefore you could register interest in N and just take
whatever action you deem appropriate on birth/death events.

	 Atanu.

>>>>> "Nathan" == Nathan K <doesnotcount@hotmail.com> writes:

    Nathan> I'm writing a process that will communicate with the bgpd
    Nathan> via xrls, however, in the case that that process fails, I
    Nathan> need the bgpd to reset its state, (ie. retract all BGP
    Nathan> Updates and disconnect from all bgp peers). Is there a way
    Nathan> to have a persistent tcp connection between my process and
    Nathan> the bgpd? If so, I could have the bgpd check the socket to
    Nathan> see if the session has been ended and then reset
    Nathan> state. Otherwise, I may have to implement a keep alive
    Nathan> mechanism via xrl in which case I'd have a timer in the main
    Nathan> loop that causes state reset upon a keep-alive timeout.

    Nathan> -Nathan.

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