Re: IGMP Non Querier - Querier Transition

Hi,

I think,
There is no rule here. However, an important problem does not here.
Because, general query is transmitted when Non-Querier changes to 
Querier.
QRV and QQIC in the query which a new Querier transmitted will be 
adopted
to other Non-Queriers.
Considering an operation person's position, the clear value is good.
The specification of a product should be clarified. Moreover, The 
function
which can choose the value of continuation or self may be good.


----- Original Message -----
> RFC 3376 says that IGMP Non-Querier should adopt the robustness and 
Query
> interval from the Querier.
> Those sections are pasted below for reference.
> 
> 4.1.6. QRV (Querier’s Robustness Variable)
> 
> If non-zero, the QRV field contains the [Robustness Variable] value
> 
> used by the querier, i.e., the sender of the Query. If the querier’s
> 
> [Robustness Variable] exceeds 7, the maximum value of the QRV field,
> 
> the QRV is set to zero. Routers adopt the QRV value from the most
> 
> recently received Query as their own [Robustness Variable] value,
> 
> unless that most recently received QRV was zero, in which case the
> 
> receivers use the default [Robustness Variable] value specified in
> 
> section 8.1 or a statically configured value.
> 
> 4.1.7. QQIC (Querier’s Query Interval Code)
> 
> The Querier’s Query Interval Code field specifies the [Query
> 
> Interval] used by the querier. The actual interval, called the
> 
> Querier’s Query Interval (QQI), is represented in units of seconds
> 
> and is derived from the Querier’s Query Interval Code as follows:
> 
> If QQIC < 128, QQI = QQIC
> 
> If QQIC >= 128, QQIC represents a floating-point value as follows:
> 
> 0 1 2 3 4 5 6 7
> 
> +-+-+-+-+-+-+-+-+
> 
> |1| exp | mant |
> 
> +-+-+-+-+-+-+-+-+
> 
> QQI = (mant | 0x10) << (exp + 3)
> 
> Multicast routers that are not the current querier adopt the QQI
> 
> value from the most recently received Query as their own [Query
> 
> Interval] value, unless that most recently received QQI was zero, in
> 
> which case the receiving routers use the default [Query Interval]
> value specified in section 8.2.
> 
> 
> 
> 
> The above sections says that these values need to adopted as their own
> values.
> But the RFC does not explain on whether the Non-Querier should 
continue with
> the adopted values,when transitions to Querier state (if the existing
> querier is down due to any reason).
> 
> Can any one please clarify me on this.
> 
> Thanks,
> RajaSekhar
>  
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> https://www.ietf.org/mailman/listinfo/magma
> 
Best Regards
--
Kiyoaki Kawaguchi
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