31.2.4 The internal variables

rX Class mrtObject&
protocols
_
& An array of handles of protocol instances active at the node at which this protocol operates indexed by incoming interface.
mask-wkgroups & Class variable--defines the mask used to identify well known groups.
wkgroups & Class array variable--array of allocated well known groups addresses, indexed by the group name. wkgroups(Allocd) is a special variable indicating the highest currently allocated well known group.



McastProtocol&
status
_
& takes values ``up'' or ``down'', to indicate the status of execution of the protocol instance.
type
_
& contains the type (class name) of protocol executed by this instance, , DM, or ST.

Simulator&
multiSim
_
& 1 if multicast simulation is enabled, 0 otherwise.
MrtHandle
_
& handle to the centralised multicast simulation object.



Node&
switch
_
& handle for classifier that looks at the high bit of the destination address in each packet to determine whether it is a multicast packet (bit = 1) or a unicast packet (bit = 0).
multiclassifier
_
& handle to classifier that performs the s, g, iif match.
replicator
_
& array indexed by s, g of handles that replicate a multicast packet on to the required links.
Agents
_
& array indexed by multicast group of the list of agents at the local node that listen to the specific group.
outLink
_
& Cached list of outgoing interfaces at this node.
inLink
_
& Cached list of incoming interfaces at this node.

Link and SimpleLink&
iif
_
& handle for the NetworkInterface object placed on this link.
head
_
& first object on the link, a no-op connector. However, this object contains the instance variable, link
_
, that points to the container Link object.

NetworkInterface&
ifacenum
_
& Class variable--holds the next available interface number.

Tom Henderson 2011-11-05