routing protocol
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... host leaves a group
and when the routing protocol is notified that there are no more
members), as discussed in section 7.8. It also allows tuning of the
burstiness of IGMP ...
... "notify routing +" notify the routing protocol that there are
members of this group on this connected network ...
... "notify routing -" notify the routing protocol that there are no
longer any members of this group on this connected network ...