Re: [pim] SPTbit clear

JGSPrasad <jgsprasad@huawei.com> Thu, 23 March 2006 06:20 UTC

Date: Thu, 23 Mar 2006 11:46:04 +0530
From: JGSPrasad <jgsprasad@huawei.com>
Subject: Re: [pim] SPTbit clear
In-reply-to: <010b01c64e14$f70d8a50$c408590a@telecom.com>
To: 황선영 <syhwang@samsung.com>
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Dear Hwang,

SPT bit would not be reset with route change unless this would lead to change in joindesired (S,G).
SPT bit would be cleared only if JoinDesired(S,G) becomes false.

As per the draft

JoinDesired(S,G) = immediate_olist(S,G) != NULL
OR ( KeepaliveTimer(S,G) is running AND inherited_olist(S,G) != NULL )

So once SPT bit is set and source is active, then SPT bit would be reset only if inherited_olist(S,G) becomes NULL.

I hope I could clarify..

Regards,
Prasad

SharadaPrasad JG

Senior Software Engineer, Embedded Business Unit

Huawei Technologies India Private Ltd,

Bangalore - 560008

Ph:+918041781770 Extn:1738

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황선영 wrote:

mid010b01c64e14$f70d8a50$c408590a@telecom.com" type="cite">
Hello, all

I have a question about SPTbit clear.

If SPT bit is set to TRUE and then upstream interface is changed,

then SPTbit should be cleared ?

I think do that, but I cannot find the behavior in draft-ietf-pim-sm-v2-new-12.

U1, U2, R1, D1 is all PIM routers.

U1                   U2

|                     |

|                   |

+-------- R1 ---------+

          |

          |

          D1

First, SPT for (S,G) is built as U1->R1->D1.

And then R1's unicast route has been changed to U2.

Then R1's (S,G) upstream should be changed.

How about the SPTbit ?

Please let me know which chapter I can refer.

Thanks and regards,

Sunyoung, Hwang
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[pim] SPTbit clear 황선영
Re: [pim] SPTbit clear JGSPrasad