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Annotation of embedaddon/mrouted/igmpv2.h, revision 1.1

1.1     ! misho       1: /*
        !             2:  * The mrouted program is covered by the license in the accompanying file
        !             3:  * named "LICENSE".  Use of the mrouted program represents acceptance of
        !             4:  * the terms and conditions listed in that file.
        !             5:  *
        !             6:  * The mrouted program is COPYRIGHT 1989 by The Board of Trustees of
        !             7:  * Leland Stanford Junior University.
        !             8:  *
        !             9:  *
        !            10:  * igmpv2.h,v 3.8.4.1 1997/11/18 23:25:58 fenner Exp
        !            11:  */
        !            12: 
        !            13: /*
        !            14:  * Constants for IGMP Version 2.  Several of these, especially the
        !            15:  * robustness variable, should be variables and not constants.
        !            16:  */
        !            17: #define        IGMP_ROBUSTNESS_VARIABLE                2
        !            18: #define        IGMP_QUERY_INTERVAL                     125
        !            19: #define        IGMP_QUERY_RESPONSE_INTERVAL            10
        !            20: #define        IGMP_GROUP_MEMBERSHIP_INTERVAL          (IGMP_ROBUSTNESS_VARIABLE * \
        !            21:                                        IGMP_QUERY_INTERVAL + \
        !            22:                                        IGMP_QUERY_RESPONSE_INTERVAL)
        !            23: #define        IGMP_OTHER_QUERIER_PRESENT_INTERVAL     (IGMP_ROBUSTNESS_VARIABLE * \
        !            24:                                        IGMP_QUERY_INTERVAL + \
        !            25:                                        IGMP_QUERY_RESPONSE_INTERVAL / 2)
        !            26:                                                /* Round to the nearest TIMER_INTERVAL */
        !            27: #define        IGMP_STARTUP_QUERY_INTERVAL             (((IGMP_QUERY_INTERVAL / 4) \
        !            28:                                                        / TIMER_INTERVAL) * TIMER_INTERVAL)
        !            29: #define        IGMP_STARTUP_QUERY_COUNT                IGMP_ROBUSTNESS_VARIABLE
        !            30: #define        IGMP_LAST_MEMBER_QUERY_INTERVAL         1
        !            31: #define        IGMP_LAST_MEMBER_QUERY_COUNT            IGMP_ROBUSTNESS_VARIABLE
        !            32: 
        !            33: /*
        !            34:  * OLD_AGE_THRESHOLD is the number of IGMP_QUERY_INTERVAL's to remember the
        !            35:  * presence of an IGMPv1 group member.  According to the IGMPv2 specification,
        !            36:  * routers remember this presence for [Robustness Variable] * [Query Interval] +
        !            37:  * [Query Response Interval].  However, OLD_AGE_THRESHOLD is in units of
        !            38:  * [Query Interval], so doesn't have sufficient resolution to represent
        !            39:  * [Query Response Interval].  When the timer mechanism gets an efficient
        !            40:  * method of refreshing timers, this should get fixed.
        !            41:  */
        !            42: #define OLD_AGE_THRESHOLD              IGMP_ROBUSTNESS_VARIABLE