(Mldv2 ) Rfc 3810 clarifications/issues
Balaji Sankaran <[email protected]> Wed, 10 Nov 2010 12:43:37 +0530
| Newsgroups | gmane.ietf.magma |
|---|---|
| Message-ID | <[email protected]> |
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Hello,
I need a couple of clarifications in MldV2 Rfc 3810.
1) In section 7.4,1 "Reception of Current State Records", I see the
following operation
EXCLUDE (X,Y) IS_EX (A) EXCLUDE (A-Y, Y*A) (A-X-Y)=MALI
Delete (X-A)
Delete (Y-A)
Filter Timer=MALI
Whether the src timer (A-X-Y) should be set to Filter timer instead of
MALI. Why we need
to set the src Timer for these srcs to MALI ?. Setting it to MALI will
take longer time for these
srcs to get excluded.
Note that TO_EXC report handling sets them to Filter timer instead of
MALI.
EXCLUDE (X,Y) TO_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y) =
Filter Timer
Delete (X-A)
Delete (Y-A)
Send Q(MA,A-Y)
Filter Timer=MALI
2) Regarding src deletion when there is a GSSQ retransmission scheduled
for it:
Lets take the following reports:
Report A { M1, IS_IN (S1, S2) }
Report B { M1, TO_EX (S1,S2) }
Report C { M1, IS_EX ( S1,S3) }
Step 1)* Send Report A *
Router will have following information for Multicast address M1,
State - Include
src-include-list - S1, S2
Step 2) *Send Report B *
After handling Report B, following will be the state information for M1
State - Exclude
Src-Req-list : S1,S2
Src-Exc-List: Empty
There will be a GSSQ packet send for S1 and S2 with Sbit Unset.
There will be another GSSQ packet scheduled for these srcs (S1 and
S2) later at LLQT interval.
Step 3) *Send Report C* before the scheduled GSSQ for S1 and S2 is
transmitted.
According to the state table, Report C handling will delete the src
S2 (Delete
(X-A) ).
EXCLUDE (X,Y) TO_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y) =
Filter Timer
Delete (X-A)
Delete (Y-A)
Send Q(MA,A-Y)
Filter Timer=MALI
However there is an GSSQ pending for the src S2. So what we do now ?
Delete the src S2 and cancel the
retransmission ? Or delete the src but do not cancel the retransmission
?. If we are not canceling the
retransmission, whether Sbit should be True for this query ?. I
believe we should delete the src
and this in turn should cancel the GSSQ retransmission for this src as
well. Let me know
if anybody has any thoughts on this.
regards,
Balaji
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Hello,
<br>
<br>
I need a couple of clarifications in MldV2 Rfc 3810.
<br>
<br>
1) In section 7.4,1 "Reception of Current State Records", I see the
following operation
<br>
<br>
EXCLUDE (X,Y) IS_EX (A) EXCLUDE (A-Y, Y*A) (A-X-Y)=MALI
<br>
Delete (X-A)
<br>
Delete (Y-A)
<br>
Filter
Timer=MALI
<br>
<br>
Whether the src timer (A-X-Y) should be set to Filter timer instead
of MALI. Why we need
<br>
to set the src Timer for these srcs to MALI ?. Setting it to MALI
will take longer time for these
<br>
srcs to get excluded.
<br>
<br>
Note that TO_EXC report handling sets them to Filter timer instead
of MALI.
<br>
<br>
EXCLUDE (X,Y) TO_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y) =
<br>
Filter
Timer
<br>
Delete (X-A)
<br>
Delete (Y-A)
<br>
Send
Q(MA,A-Y)
<br>
Filter
Timer=MALI
<br>
<br>
<br>
<br>
2) Regarding src deletion when there is a GSSQ retransmission
scheduled for it:
<br>
<br>
Lets take the following reports:
<br>
<br>
Report A { M1, IS_IN (S1, S2) }
<br>
Report B { M1, TO_EX (S1,S2) }
<br>
Report C { M1, IS_EX ( S1,S3) }
<br>
<br>
Step 1)<b> Send Report A
</b><br>
Router will have following information for Multicast address M1,
<br>
<br>
State - Include
<br>
src-include-list - S1, S2
<br>
<br>
Step 2) <b>Send Report B
</b><br>
After handling Report B, following will be the state information for
M1
<br>
<br>
State - Exclude
<br>
Src-Req-list : S1,S2
<br>
Src-Exc-List: Empty
<br>
There will be a GSSQ packet send for S1 and S2 with Sbit Unset.
<br>
There will be another GSSQ packet scheduled for these srcs (S1 and
<br>
S2) later at LLQT interval.
<br>
<br>
<br>
<br>
Step 3) <b>Send Report C</b> before the scheduled GSSQ for S1 and
S2 is transmitted.
<br>
According to the state table, Report C handling will delete the
src S2 (Delete
<br>
(X-A) ).
<br>
<br>
EXCLUDE (X,Y) TO_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y) =
<br>
Filter
Timer
<br>
Delete (X-A)
<br>
Delete (Y-A)
<br>
Send
Q(MA,A-Y)
<br>
Filter
Timer=MALI
<br>
<br>
However there is an GSSQ pending for the src S2. So what we do now
? Delete the src S2 and cancel the
<br>
retransmission ? Or delete the src but do not cancel the
retransmission ?. If we are not canceling the
<br>
retransmission, whether Sbit should be True for this query ?. I
believe we should delete the src<br>
and this in turn should cancel the GSSQ retransmission for this src
as well. Let me know<br>
if anybody has any thoughts on this.<br>
<br>
<br>
regards,
<br>
Balaji
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