typedef struct {
	MacAddr destination;	// Mac address of some target
	int	ifnumber;	// which interface/port to reach it
	u_short TTL;		// how old is this information
}
	

void
updateTable(MacAddr src, int inif)
{
	BridgeEntry *b;

	if (mapResolve(bridgeMap, &src, (void**)&b) == FALSE) {
		// this address is not in the table
		if (numEntries < BRIDGE_TAB_SIZE) {
			// add to the table
			...
			...
			numEntries++;
		} else {
			//  no room. give up!
			return;
		}
	}
	// reset TTL and use most recently discovered input
	// interface
	b->TTL = MAX_TTL;  // refresh
	b->ifnumber = inif;
}



int
getOutputInterface(MacAddr dest)
{
	BridgeEntry b;
	if (mapResolve(bridgeMap, &dest, (void**)&b) == FALSE)
	        return -1;
	else
		return b->ifnumber;
}