[Xorp-users] How to decide Unsolicited Report Interval in IGMPv3 XORP

[Pavlin Radoslavov]

Tushar Mehta <tushar.mehta at einfochips.com> wrote:

> Can anyone tell me how i can find the Unsolicited Report Interval that 
> is used when any IGMP host use while transmitting state change record?
> 
> according to the rfc-3376:
> - To cover the possibility of the State-Change Report being missed by 
> one or more multicast routers, it is retransmitted [Robustness
>   Variable] - 1 more times, at intervals chosen at random from the range 
> (0, [Unsolicited Report Interval]).
> 
> - Unsolicited Report Interval
>    The Unsolicited Report Interval is the time between repetitions of a
>    host's initial report of membership in a group.  Default: 1 second.
> 
> by default Unsolicited Report Interval should be 1 but XORP is not 
> following it. it is picking up this interval randamly.

As Bruce mentioned in another email on the subject, this is
kernel-related config.

To clarify:
IGMP/MLD has two parts: router-side and host-side.
The host-side is typically implemented by the OS (in the kernel).
The router-side is typically an userland process.

XORP implements only the router-side, and for the host-side relies
on the kernel implementation.
The configuration changes in XORP apply only to the router side; the
host-side configuration changes are OS specific and you should refer
to the particular OS/kernel documentation for that.
In the future we might expose the host-side configuration in the
xorpsh, but right now this is a very low priority for us.

Hope that helps,
Pavlin



> i m attaching the configuration file that i am using for my set up.
> 
> 
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