Re: [magma] Querier transition based on Group Specific Query?
Bharat Joshi <bharat_joshi@infosys.com> Wed, 01 February 2012 13:17 UTC
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From: Bharat Joshi <bharat_joshi@infosys.com>
To: "V, Magesh (Magesh)" <magesh.v@alcatel-lucent.com>, Indranil Bhattacharya <myselfindranil@gmail.com>
Date: Wed, 01 Feb 2012 18:47:35 +0530
Thread-Topic: [magma] Querier transition based on Group Specific Query?
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Cc: "magma@ietf.org" <magma@ietf.org>
Subject: Re: [magma] Querier transition based on Group Specific Query?
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Magesh, The snippet you have copied in your mail is from the last para of section 3 of RFC 2236. In the same section, in second para of the same section, we have following text: >>> If a multicast router hears a Query message from a router with a lower IP address, it MUST become a Non-Querier on that network. <<<< Please note that the above text uses 'Query message' and it does not clearly says which query message. In RFC 2236, querier election has used either 'Query' or 'Membership Query' interchangeably. I could not find an instance where it clearly says that it must be only general query messages. Also I just checked the state diagram also and in Non-querier case also, it just mention that if a 'query' is received from a lower IP address. It does not mention what type of query it is. So as far as I can see, this is not clear from the RFC. Regards, Bharat ________________________________________ From: V, Magesh (Magesh) [magesh.v@alcatel-lucent.com] Sent: Wednesday, February 01, 2012 6:35 PM To: Bharat Joshi; Indranil Bhattacharya Cc: magma@ietf.org Subject: RE: [magma] Querier transition based on Group Specific Query? Hi, I believe querier election is driven by only Gen.Quer msgs. An igmp router can be in either 'Querier' or 'Non-Querier' state. Since GSQs will be sent only by 'Querier' then we have to see what a 'Non-Querier' is recommended to do upon reception of GSQ. The 'Non-Querier' should ONLY update its grp membership timer. The below snippet from last paragraph of section-3 explains this. <<<<<<<<<<<<<<<<<<<< When a non-Querier receives a Group-Specific Query message, if its existing group membership timer is greater than [Last Member Query Count] times the Max Response Time specified in the message, it sets its group membership timer to that value. >>>>>>>>>>>>>>>>>>> Also, the 'Non-Querier' state diagram reiterates the above interpretation. Thanks, Magesh. -----Original Message----- From: magma-bounces@ietf.org [mailto:magma-bounces@ietf.org] On Behalf Of Bharat Joshi Sent: Tuesday, January 31, 2012 7:39 PM To: Indranil Bhattacharya Cc: magma@ietf.org Subject: Re: [magma] Querier transition based on Group Specific Query? Indranil. Looks like what you are saying is correct. So it seems querier election logic should run when either group-specific queries or general queries are received. Regards, Bharat ________________________________________ From: Indranil Bhattacharya [myselfindranil@gmail.com] Sent: Tuesday, January 31, 2012 7:24 PM To: Bharat Joshi Cc: magma@ietf.org Subject: Re: [magma] Querier transition based on Group Specific Query? Hi Bharat, RFC 2236, from Section 2.1 0x11 = Membership Query There are two sub-types of Membership Query messages: - General Query, used to learn which groups have members on an attached network. - Group-Specific Query, used to learn if a particular group has any members on an attached network. So Membership Query means both. Thanks, Indranil On Tue, Jan 31, 2012 at 7:00 PM, Bharat Joshi <bharat_joshi@infosys.com<mailto:bharat_joshi@infosys.com>> wrote: Hi Indranil, Is this defined in an RFC like that? Can you point me to the reference where it says what you mean below? I just did a google search on this and few top results for this seems to refer to general query only. Regards, Bharat ________________________________________ From: Indranil Bhattacharya [myselfindranil@gmail.com<mailto:myselfindranil@gmail.com>] Sent: Tuesday, January 31, 2012 6:58 PM To: Bharat Joshi Cc: magma@ietf.org<mailto:magma@ietf.org> Subject: Re: [magma] Querier transition based on Group Specific Query? Hi Bharat, "IGMP Membership Query"query does not mean only General Query. It means both GQ and GSQ. Anything on this? Thanks, Indranil On Tue, Jan 31, 2012 at 4:33 PM, Bharat Joshi <bharat_joshi@infosys.com<mailto:bharat_joshi@infosys.com><mailto:bharat_joshi@infosys.com<mailto:bharat_joshi@infosys.com>>> wrote: Hi Indranil, I think a router should always be looking at general queries. This is what is available in RFC 2236: >>> The following three events can cause the router to change states: - "query timer expired" occurs when the timer set for query transmission expires. - "query received from a router with a lower IP address" occurs when an IGMP Membership Query is received from a router on the same network with a lower IP address. - "other querier present timer expired" occurs when the timer set to note the presence of another querier with a lower IP address on the network expires. <<< The second point clearly says that it should be an "IGMP Membership Query" which can trigger a change in querier state. Regards, Bharat ________________________________________ From: magma-bounces@ietf.org<mailto:magma-bounces@ietf.org><mailto:magma-bounces@ietf.org<mailto:magma-bounces@ietf.org>> [magma-bounces@ietf.org<mailto:magma-bounces@ietf.org><mailto:magma-bounces@ietf.org<mailto:magma-bounces@ietf.org>>] On Behalf Of Indranil Bhattacharya [myselfindranil@gmail.com<mailto:myselfindranil@gmail.com><mailto:myselfindranil@gmail.com<mailto:myselfindranil@gmail.com>>] Sent: Tuesday, January 31, 2012 8:56 AM To: magma@ietf.org<mailto:magma@ietf.org><mailto:magma@ietf.org<mailto:magma@ietf.org>> Subject: [magma] Querier transition based on Group Specific Query? Hi, In the querier transition state machine, RFC 2236 only mentions 'Query' and does not specify GQ or GSQ. Can a querier transition take place based on GSQ? Or is it okay to for a querier to ignore GSQ? Can anyone please help me with this? 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- [magma] Querier transition based on Group Specifi… Indranil Bhattacharya
- Re: [magma] Querier transition based on Group Spe… Kudachi, Deepak S
- Re: [magma] Querier transition based on Group Spe… Bharat Joshi
- Re: [magma] Querier transition based on Group Spe… Indranil Bhattacharya
- Re: [magma] Querier transition based on Group Spe… Indranil Bhattacharya
- Re: [magma] Querier transition based on Group Spe… Bharat Joshi
- Re: [magma] Querier transition based on Group Spe… Indranil Bhattacharya
- Re: [magma] Querier transition based on Group Spe… Bharat Joshi
- Re: [magma] Querier transition based on Group Spe… Bharat Joshi
- Re: [magma] Querier transition based on Group Spe… V, Magesh (Magesh)
- Re: [magma] Querier transition based on Group Spe… V, Magesh (Magesh)
- Re: [magma] Querier transition based on Group Spe… Bharat Joshi