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 43