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

[Pavlin Radoslavov]

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

> I want to configure my OS(on which XORP is running) for IGMPv3 host also and
> want to set parameter Unsolicited Report Interval.
> which file i have to modify for configuring my OS as IGMPv3 host.

As I mentioned in my earlier email, those settings are OS specific,
so the Linux folks are a better source of information.

Anyway, after a quick check, I guess you can use the following
command (as a root) to explicitly set the IGMP version to 3:

sysctl -w net.ipv4.conf.all.force_igmp_version=3

Regarding the setting the Unsolicited Report Interval in the kernel,
I guess you cannot change it without recomping the kernel. A quick
search in file linux/net/ipv4/igmp.c (Linux kernel 2.6.15.1) reveals
that it is defined there and is not configuratble:

#define IGMP_Unsolicited_Report_Interval        (10*HZ)

Hence, if you want to change it, you must modify the above value and
recompile the kernel.


Hope that helps,
Pavlin

> I am attaching the XORP configuration file which is used by me for running
> IGMPv3(IPv4).
> Robustness variable is set to 5(high) just for increasing the retransmission
> for the state change report
> so that i can check whether interval between them is ( 0, Unsolicited Report
> Interval) or not.
> 
> OS specification on which XORP is running:
> OS: Fedora Core 5
> kernel version: 2.6.15-1.2054_FC5
> architecture: i686
> XORP version: 1.4
> IGMP version: 3( for IPv4)
> 
> Pavlin Radoslavov wrote:
> > 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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> 
> /* $XORP: xorp/rtrmgr/config.boot.sample,v 1.46 2007/03/12 10:16:05 atanu Exp $ */
> 
> 
> interfaces {
>     restore-original-config-on-shutdown: false
>     interface eth0 {
> 	description: "ethernet interface"
> 	disable: false
> 	default-system-config
> 	}
> }
> 
> 
> fea {
>     unicast-forwarding4 {
> 	disable: false
> 	forwarding-entries {
> 	    retain-on-startup: false 
> 	    retain-on-shutdown:	false
> 	}
>     }
> }
> 
> 
> policy {
>     /* Describe connected routes for redistribution */
>     policy-statement connected {
> 	term export {
> 	    from {
> 		protocol: "connected"
> 	    }
> 	}
>     }
> }
> 
> policy {
>     /* Describe static routes for redistribution */
>     policy-statement static {
> 	term export {
> 	    from {
> 		protocol: "static"
> 	    }
> 	}
>     }
> }
> 
> plumbing {
>     mfea4 {
> 	disable: false
> 	interface eth0 {
> 	    vif eth0 {
> 		disable: false
> 	    }
> 	}
> 	interface register_vif {
> 	    vif register_vif {
> 		/* Note: this vif should be always enabled */
> 		disable: false
> 	    }
> 	}
> 	traceoptions {
> 	    flag all {
> 		disable: false
> 	    }
> 	}
>     }
> }
> 
> protocols {
>     igmp {
> 	disable: false
> 	interface eth0 {
> 	    vif eth0 {
> 		disable: false		
> 		 version: 3
> 		 enable-ip-router-alert-option-check: true
> 		 query-interval: 5
> 		 query-last-member-interval: 5
> 		 query-response-interval: 2
> 		 robust-count: 5 
> 	    }
> 	}
> 	traceoptions {
> 	    flag all {
> 		disable: false
> 	    }
> 	}
>     }
> }
> 
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